aboutsummaryrefslogtreecommitdiff
path: root/target/i386/kvm.c
blob: 2adf992c84a084fe43697c78c642843dd5a1e90b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
/*
 * QEMU KVM support
 *
 * Copyright (C) 2006-2008 Qumranet Technologies
 * Copyright IBM, Corp. 2008
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include <sys/ioctl.h>
#include <sys/utsname.h>

#include <linux/kvm.h>
#include <linux/kvm_para.h>

#include "qemu-common.h"
#include "cpu.h"
#include "sysemu/sysemu.h"
#include "sysemu/hw_accel.h"
#include "sysemu/kvm_int.h"
#include "kvm_i386.h"
#include "hyperv.h"

#include "exec/gdbstub.h"
#include "qemu/host-utils.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "hw/i386/pc.h"
#include "hw/i386/apic.h"
#include "hw/i386/apic_internal.h"
#include "hw/i386/apic-msidef.h"
#include "hw/i386/intel_iommu.h"
#include "hw/i386/x86-iommu.h"

#include "exec/ioport.h"
#include "standard-headers/asm-x86/hyperv.h"
#include "hw/pci/pci.h"
#include "hw/pci/msi.h"
#include "migration/migration.h"
#include "exec/memattrs.h"
#include "trace.h"

//#define DEBUG_KVM

#ifdef DEBUG_KVM
#define DPRINTF(fmt, ...) \
    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
    do { } while (0)
#endif

#define MSR_KVM_WALL_CLOCK  0x11
#define MSR_KVM_SYSTEM_TIME 0x12

/* A 4096-byte buffer can hold the 8-byte kvm_msrs header, plus
 * 255 kvm_msr_entry structs */
#define MSR_BUF_SIZE 4096

const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
    KVM_CAP_INFO(SET_TSS_ADDR),
    KVM_CAP_INFO(EXT_CPUID),
    KVM_CAP_INFO(MP_STATE),
    KVM_CAP_LAST_INFO
};

static bool has_msr_star;
static bool has_msr_hsave_pa;
static bool has_msr_tsc_aux;
static bool has_msr_tsc_adjust;
static bool has_msr_tsc_deadline;
static bool has_msr_feature_control;
static bool has_msr_misc_enable;
static bool has_msr_smbase;
static bool has_msr_bndcfgs;
static int lm_capable_kernel;
static bool has_msr_hv_hypercall;
static bool has_msr_hv_crash;
static bool has_msr_hv_reset;
static bool has_msr_hv_vpindex;
static bool has_msr_hv_runtime;
static bool has_msr_hv_synic;
static bool has_msr_hv_stimer;
static bool has_msr_xss;

static bool has_msr_architectural_pmu;
static uint32_t num_architectural_pmu_counters;

static int has_xsave;
static int has_xcrs;
static int has_pit_state2;

static bool has_msr_mcg_ext_ctl;

static struct kvm_cpuid2 *cpuid_cache;

int kvm_has_pit_state2(void)
{
    return has_pit_state2;
}

bool kvm_has_smm(void)
{
    return kvm_check_extension(kvm_state, KVM_CAP_X86_SMM);
}

bool kvm_has_adjust_clock_stable(void)
{
    int ret = kvm_check_extension(kvm_state, KVM_CAP_ADJUST_CLOCK);

    return (ret == KVM_CLOCK_TSC_STABLE);
}

bool kvm_allows_irq0_override(void)
{
    return !kvm_irqchip_in_kernel() || kvm_has_gsi_routing();
}

static bool kvm_x2apic_api_set_flags(uint64_t flags)
{
    KVMState *s = KVM_STATE(current_machine->accelerator);

    return !kvm_vm_enable_cap(s, KVM_CAP_X2APIC_API, 0, flags);
}

#define MEMORIZE(fn, _result) \
    ({ \
        static bool _memorized; \
        \
        if (_memorized) { \
            return _result; \
        } \
        _memorized = true; \
        _result = fn; \
    })

static bool has_x2apic_api;

bool kvm_has_x2apic_api(void)
{
    return has_x2apic_api;
}

bool kvm_enable_x2apic(void)
{
    return MEMORIZE(
             kvm_x2apic_api_set_flags(KVM_X2APIC_API_USE_32BIT_IDS |
                                      KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK),
             has_x2apic_api);
}

static int kvm_get_tsc(CPUState *cs)
{
    X86CPU *cpu = X86_CPU(cs);
    CPUX86State *env = &cpu->env;
    struct {
        struct kvm_msrs info;
        struct kvm_msr_entry entries[1];
    } msr_data;
    int ret;

    if (env->tsc_valid) {
        return 0;
    }

    msr_data.info.nmsrs = 1;
    msr_data.entries[0].index = MSR_IA32_TSC;
    env->tsc_valid = !runstate_is_running();

    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, &msr_data);
    if (ret < 0) {
        return ret;
    }

    assert(ret == 1);
    env->tsc = msr_data.entries[0].data;
    return 0;
}

static inline void do_kvm_synchronize_tsc(CPUState *cpu, run_on_cpu_data arg)
{
    kvm_get_tsc(cpu);
}

void kvm_synchronize_all_tsc(void)
{
    CPUState *cpu;

    if (kvm_enabled()) {
        CPU_FOREACH(cpu) {
            run_on_cpu(cpu, do_kvm_synchronize_tsc, RUN_ON_CPU_NULL);
        }
    }
}

static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
{
    struct kvm_cpuid2 *cpuid;
    int r, size;

    size = sizeof(*cpuid) + max * sizeof(*cpuid->entries);
    cpuid = g_malloc0(size);
    cpuid->nent = max;
    r = kvm_ioctl(s, KVM_GET_SUPPORTED_CPUID, cpuid);
    if (r == 0 && cpuid->nent >= max) {
        r = -E2BIG;
    }
    if (r < 0) {
        if (r == -E2BIG) {
            g_free(cpuid);
            return NULL;
        } else {
            fprintf(stderr, "KVM_GET_SUPPORTED_CPUID failed: %s\n",
                    strerror(-r));
            exit(1);
        }
    }
    return cpuid;
}

/* Run KVM_GET_SUPPORTED_CPUID ioctl(), allocating a buffer large enough
 * for all entries.
 */
static struct kvm_cpuid2 *get_supported_cpuid(KVMState *s)
{
    struct kvm_cpuid2 *cpuid;
    int max = 1;

    if (cpuid_cache != NULL) {
        return cpuid_cache;
    }
    while ((cpuid = try_get_cpuid(s, max)) == NULL) {
        max *= 2;
    }
    cpuid_cache = cpuid;
    return cpuid;
}

static const struct kvm_para_features {
    int cap;
    int feature;
} para_features[] = {
    { KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE },
    { KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY },
    { KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
    { KVM_CAP_ASYNC_PF, KVM_FEATURE_ASYNC_PF },
};

static int get_para_features(KVMState *s)
{
    int i, features = 0;

    for (i = 0; i < ARRAY_SIZE(para_features); i++) {
        if (kvm_check_extension(s, para_features[i].cap)) {
            features |= (1 << para_features[i].feature);
        }
    }

    return features;
}


/* Returns the value for a specific register on the cpuid entry
 */
static uint32_t cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry, int reg)
{
    uint32_t ret = 0;
    switch (reg) {
    case R_EAX:
        ret = entry->eax;
        break;
    case R_EBX:
        ret = entry->ebx;
        break;
    case R_ECX:
        ret = entry->ecx;
        break;
    case R_EDX:
        ret = entry->edx;
        break;
    }
    return ret;
}

/* Find matching entry for function/index on kvm_cpuid2 struct
 */
static struct kvm_cpuid_entry2 *cpuid_find_entry(struct kvm_cpuid2 *cpuid,
                                                 uint32_t function,
                                                 uint32_t index)
{
    int i;
    for (i = 0; i < cpuid->nent; ++i) {
        if (cpuid->entries[i].function == function &&
            cpuid->entries[i].index == index) {
            return &cpuid->entries[i];
        }
    }
    /* not found: */
    return NULL;
}

uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function,
                                      uint32_t index, int reg)
{
    struct kvm_cpuid2 *cpuid;
    uint32_t ret = 0;
    uint32_t cpuid_1_edx;
    bool found = false;

    cpuid = get_supported_cpuid(s);

    struct kvm_cpuid_entry2 *entry = cpuid_find_entry(cpuid, function, index);
    if (entry) {
        found = true;
        ret = cpuid_entry_get_reg(entry, reg);
    }

    /* Fixups for the data returned by KVM, below */

    if (function == 1 && reg == R_EDX) {
        /* KVM before 2.6.30 misreports the following features */
        ret |= CPUID_MTRR | CPUID_PAT | CPUID_MCE | CPUID_MCA;
    } else if (function == 1 && reg == R_ECX) {
        /* We can set the hypervisor flag, even if KVM does not return it on
         * GET_SUPPORTED_CPUID
         */
        ret |= CPUID_EXT_HYPERVISOR;
        /* tsc-deadline flag is not returned by GET_SUPPORTED_CPUID, but it
         * can be enabled if the kernel has KVM_CAP_TSC_DEADLINE_TIMER,
         * and the irqchip is in the kernel.
         */
        if (kvm_irqchip_in_kernel() &&
                kvm_check_extension(s, KVM_CAP_TSC_DEADLINE_TIMER)) {
            ret |= CPUID_EXT_TSC_DEADLINE_TIMER;
        }

        /* x2apic is reported by GET_SUPPORTED_CPUID, but it can't be enabled
         * without the in-kernel irqchip
         */
        if (!kvm_irqchip_in_kernel()) {
            ret &= ~CPUID_EXT_X2APIC;
        }
    } else if (function == 6 && reg == R_EAX) {
        ret |= CPUID_6_EAX_ARAT; /* safe to allow because of emulated APIC */
    } else if (function == 0x80000001 && reg == R_EDX) {
        /* On Intel, kvm returns cpuid according to the Intel spec,
         * so add missing bits according to the AMD spec:
         */
        cpuid_1_edx = kvm_arch_get_supported_cpuid(s, 1, 0, R_EDX);
        ret |= cpuid_1_edx & CPUID_EXT2_AMD_ALIASES;
    } else if (function == KVM_CPUID_FEATURES && reg == R_EAX) {
        /* kvm_pv_unhalt is reported by GET_SUPPORTED_CPUID, but it can't
         * be enabled without the in-kernel irqchip
         */
        if (!kvm_irqchip_in_kernel()) {
            ret &= ~(1U << KVM_FEATURE_PV_UNHALT);
        }
    }

    /* fallback for older kernels */
    if ((function == KVM_CPUID_FEATURES) && !found) {
        ret = get_para_features(s);
    }

    return ret;
}

typedef struct HWPoisonPage {
    ram_addr_t ram_addr;
    QLIST_ENTRY(HWPoisonPage) list;
} HWPoisonPage;

static QLIST_HEAD(, HWPoisonPage) hwpoison_page_list =
    QLIST_HEAD_INITIALIZER(hwpoison_page_list);

static void kvm_unpoison_all(void *param)
{
    HWPoisonPage *page, *next_page;

    QLIST_FOREACH_SAFE(page, &hwpoison_page_list, list, next_page) {
        QLIST_REMOVE(page, list);
        qemu_ram_remap(page->ram_addr, TARGET_PAGE_SIZE);
        g_free(page);
    }
}

static void kvm_hwpoison_page_add(ram_addr_t ram_addr)
{
    HWPoisonPage *page;

    QLIST_FOREACH(page, &hwpoison_page_list, list) {
        if (page->ram_addr == ram_addr) {
            return;
        }
    }
    page = g_new(HWPoisonPage, 1);
    page->ram_addr = ram_addr;
    QLIST_INSERT_HEAD(&hwpoison_page_list, page, list);
}

static int kvm_get_mce_cap_supported(KVMState *s, uint64_t *mce_cap,
                                     int *max_banks)
{
    int r;

    r = kvm_check_extension(s, KVM_CAP_MCE);
    if (r > 0) {
        *max_banks = r;
        return kvm_ioctl(s, KVM_X86_GET_MCE_CAP_SUPPORTED, mce_cap);
    }
    return -ENOSYS;
}

static void kvm_mce_inject(X86CPU *cpu, hwaddr paddr, int code)
{
    CPUState *cs = CPU(cpu);
    CPUX86State *env = &cpu->env;
    uint64_t status = MCI_STATUS_VAL | MCI_STATUS_UC | MCI_STATUS_EN |
                      MCI_STATUS_MISCV | MCI_STATUS_ADDRV | MCI_STATUS_S;
    uint64_t mcg_status = MCG_STATUS_MCIP;
    int flags = 0;

    if (code == BUS_MCEERR_AR) {
        status |= MCI_STATUS_AR | 0x134;
        mcg_status |= MCG_STATUS_EIPV;
    } else {
        status |= 0xc0;
        mcg_status |= MCG_STATUS_RIPV;
    }

    flags = cpu_x86_support_mca_broadcast(env) ? MCE_INJECT_BROADCAST : 0;
    /* We need to read back the value of MSR_EXT_MCG_CTL that was set by the
     * guest kernel back into env->mcg_ext_ctl.
     */
    cpu_synchronize_state(cs);
    if (env->mcg_ext_ctl & MCG_EXT_CTL_LMCE_EN) {
        mcg_status |= MCG_STATUS_LMCE;
        flags = 0;
    }

    cpu_x86_inject_mce(NULL, cpu, 9, status, mcg_status, paddr,
                       (MCM_ADDR_PHYS << 6) | 0xc, flags);
}

static void hardware_memory_error(void)
{
    fprintf(stderr, "Hardware memory error!\n");
    exit(1);
}

int kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
{
    X86CPU *cpu = X86_CPU(c);
    CPUX86State *env = &cpu->env;
    ram_addr_t ram_addr;
    hwaddr paddr;

    /* If we get an action required MCE, it has been injected by KVM
     * while the VM was running.  An action optional MCE instead should
     * be coming from the main thread, which qemu_init_sigbus identifies
     * as the "early kill" thread.
     */
    assert(code == BUS_MCEERR_AR || code == BUS_MCEERR_AO);

    if ((env->mcg_cap & MCG_SER_P) && addr) {
        ram_addr = qemu_ram_addr_from_host(addr);
        if (ram_addr != RAM_ADDR_INVALID &&
            kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)) {
            kvm_hwpoison_page_add(ram_addr);
            kvm_mce_inject(cpu, paddr, code);
            return 0;
        }

        fprintf(stderr, "Hardware memory error for memory used by "
                "QEMU itself instead of guest system!\n");
    }

    if (code == BUS_MCEERR_AR) {
        hardware_memory_error();
    }

    /* Hope we are lucky for AO MCE */
    return 0;
}

static int kvm_inject_mce_oldstyle(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;

    if (!kvm_has_vcpu_events() && env->exception_injected == EXCP12_MCHK) {
        unsigned int bank, bank_num = env->mcg_cap & 0xff;
        struct kvm_x86_mce mce;

        env->exception_injected = -1;

        /*
         * There must be at least one bank in use if an MCE is pending.
         * Find it and use its values for the event injection.
         */
        for (bank = 0; bank < bank_num; bank++) {
            if (env->mce_banks[bank * 4 + 1] & MCI_STATUS_VAL) {
                break;
            }
        }
        assert(bank < bank_num);

        mce.bank = bank;
        mce.status = env->mce_banks[bank * 4 + 1];
        mce.mcg_status = env->mcg_status;
        mce.addr = env->mce_banks[bank * 4 + 2];
        mce.misc = env->mce_banks[bank * 4 + 3];

        return kvm_vcpu_ioctl(CPU(cpu), KVM_X86_SET_MCE, &mce);
    }
    return 0;
}

static void cpu_update_state(void *opaque, int running, RunState state)
{
    CPUX86State *env = opaque;

    if (running) {
        env->tsc_valid = false;
    }
}

unsigned long kvm_arch_vcpu_id(CPUState *cs)
{
    X86CPU *cpu = X86_CPU(cs);
    return cpu->apic_id;
}

#ifndef KVM_CPUID_SIGNATURE_NEXT
#define KVM_CPUID_SIGNATURE_NEXT                0x40000100
#endif

static bool hyperv_hypercall_available(X86CPU *cpu)
{
    return cpu->hyperv_vapic ||
           (cpu->hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_RETRY);
}

static bool hyperv_enabled(X86CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    return kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV) > 0 &&
           (hyperv_hypercall_available(cpu) ||
            cpu->hyperv_time  ||
            cpu->hyperv_relaxed_timing ||
            cpu->hyperv_crash ||
            cpu->hyperv_reset ||
            cpu->hyperv_vpindex ||
            cpu->hyperv_runtime ||
            cpu->hyperv_synic ||
            cpu->hyperv_stimer);
}

static int kvm_arch_set_tsc_khz(CPUState *cs)
{
    X86CPU *cpu = X86_CPU(cs);
    CPUX86State *env = &cpu->env;
    int r;

    if (!env->tsc_khz) {
        return 0;
    }

    r = kvm_check_extension(cs->kvm_state, KVM_CAP_TSC_CONTROL) ?
        kvm_vcpu_ioctl(cs, KVM_SET_TSC_KHZ, env->tsc_khz) :
        -ENOTSUP;
    if (r < 0) {
        /* When KVM_SET_TSC_KHZ fails, it's an error only if the current
         * TSC frequency doesn't match the one we want.
         */
        int cur_freq = kvm_check_extension(cs->kvm_state, KVM_CAP_GET_TSC_KHZ) ?
                       kvm_vcpu_ioctl(cs, KVM_GET_TSC_KHZ) :
                       -ENOTSUP;
        if (cur_freq <= 0 || cur_freq != env->tsc_khz) {
            error_report("warning: TSC frequency mismatch between "
                         "VM (%" PRId64 " kHz) and host (%d kHz), "
                         "and TSC scaling unavailable",
                         env->tsc_khz, cur_freq);
            return r;
        }
    }

    return 0;
}

static int hyperv_handle_properties(CPUState *cs)
{
    X86CPU *cpu = X86_CPU(cs);
    CPUX86State *env = &cpu->env;

    if (cpu->hyperv_time &&
            kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV_TIME) <= 0) {
        cpu->hyperv_time = false;
    }

    if (cpu->hyperv_relaxed_timing) {
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_HYPERCALL_AVAILABLE;
    }
    if (cpu->hyperv_vapic) {
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_HYPERCALL_AVAILABLE;
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_APIC_ACCESS_AVAILABLE;
    }
    if (cpu->hyperv_time) {
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_HYPERCALL_AVAILABLE;
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_TIME_REF_COUNT_AVAILABLE;
        env->features[FEAT_HYPERV_EAX] |= 0x200;
    }
    if (cpu->hyperv_crash && has_msr_hv_crash) {
        env->features[FEAT_HYPERV_EDX] |= HV_X64_GUEST_CRASH_MSR_AVAILABLE;
    }
    env->features[FEAT_HYPERV_EDX] |= HV_X64_CPU_DYNAMIC_PARTITIONING_AVAILABLE;
    if (cpu->hyperv_reset && has_msr_hv_reset) {
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_RESET_AVAILABLE;
    }
    if (cpu->hyperv_vpindex && has_msr_hv_vpindex) {
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_VP_INDEX_AVAILABLE;
    }
    if (cpu->hyperv_runtime && has_msr_hv_runtime) {
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_VP_RUNTIME_AVAILABLE;
    }
    if (cpu->hyperv_synic) {
        int sint;

        if (!has_msr_hv_synic ||
            kvm_vcpu_enable_cap(cs, KVM_CAP_HYPERV_SYNIC, 0)) {
            fprintf(stderr, "Hyper-V SynIC is not supported by kernel\n");
            return -ENOSYS;
        }

        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_SYNIC_AVAILABLE;
        env->msr_hv_synic_version = HV_SYNIC_VERSION_1;
        for (sint = 0; sint < ARRAY_SIZE(env->msr_hv_synic_sint); sint++) {
            env->msr_hv_synic_sint[sint] = HV_SYNIC_SINT_MASKED;
        }
    }
    if (cpu->hyperv_stimer) {
        if (!has_msr_hv_stimer) {
            fprintf(stderr, "Hyper-V timers aren't supported by kernel\n");
            return -ENOSYS;
        }
        env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_SYNTIMER_AVAILABLE;
    }
    return 0;
}

static Error *invtsc_mig_blocker;

#define KVM_MAX_CPUID_ENTRIES  100

int kvm_arch_init_vcpu(CPUState *cs)
{
    struct {
        struct kvm_cpuid2 cpuid;
        struct kvm_cpuid_entry2 entries[KVM_MAX_CPUID_ENTRIES];
    } QEMU_PACKED cpuid_data;
    X86CPU *cpu = X86_CPU(cs);
    CPUX86State *env = &cpu->env;
    uint32_t limit, i, j, cpuid_i;
    uint32_t unused;
    struct kvm_cpuid_entry2 *c;
    uint32_t signature[3];
    int kvm_base = KVM_CPUID_SIGNATURE;
    int r;
    Error *local_err = NULL;

    memset(&cpuid_data, 0, sizeof(cpuid_data));

    cpuid_i = 0;

    /* Paravirtualization CPUIDs */
    if (hyperv_enabled(cpu)) {
        c = &cpuid_data.entries[cpuid_i++];
        c->function = HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS;
        if (!cpu->hyperv_vendor_id) {
            memcpy(signature, "Microsoft Hv", 12);
        } else {
            size_t len = strlen(cpu->hyperv_vendor_id);

            if (len > 12) {
                error_report("hv-vendor-id truncated to 12 characters");
                len = 12;
            }
            memset(signature, 0, 12);
            memcpy(signature, cpu->hyperv_vendor_id, len);
        }
        c->eax = HYPERV_CPUID_MIN;
        c->ebx = signature[0];
        c->ecx = signature[1];
        c->edx = signature[2];

        c = &cpuid_data.entries[cpuid_i++];
        c->function = HYPERV_CPUID_INTERFACE;
        memcpy(signature, "Hv#1\0\0\0\0\0\0\0\0", 12);
        c->eax = signature[0];
        c->ebx = 0;
        c->ecx = 0;
        c->edx = 0;

        c = &cpuid_data.entries[cpuid_i++];
        c->function = HYPERV_CPUID_VERSION;
        c->eax = 0x00001bbc;
        c->ebx = 0x00060001;

        c = &cpuid_data.entries[cpuid_i++];
        c->function = HYPERV_CPUID_FEATURES;
        r = hyperv_handle_properties(cs);
        if (r) {
            return r;
        }
        c->eax = env->features[FEAT_HYPERV_EAX];
        c->ebx = env->features[FEAT_HYPERV_EBX];
        c->edx = env->features[FEAT_HYPERV_EDX];

        c = &cpuid_data.entries[cpuid_i++];
        c->function = HYPERV_CPUID_ENLIGHTMENT_INFO;
        if (cpu->hyperv_relaxed_timing) {
            c->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED;
        }
        if (cpu->hyperv_vapic) {
            c->eax |= HV_X64_APIC_ACCESS_RECOMMENDED;
        }
        c->ebx = cpu->hyperv_spinlock_attempts;

        c = &cpuid_data.entries[cpuid_i++];
        c->function = HYPERV_CPUID_IMPLEMENT_LIMITS;
        c->eax = 0x40;
        c->ebx = 0x40;

        kvm_base = KVM_CPUID_SIGNATURE_NEXT;
        has_msr_hv_hypercall = true;
    }

    if (cpu->expose_kvm) {
        memcpy(signature, "KVMKVMKVM\0\0\0", 12);
        c = &cpuid_data.entries[cpuid_i++];
        c->function = KVM_CPUID_SIGNATURE | kvm_base;
        c->eax = KVM_CPUID_FEATURES | kvm_base;
        c->ebx = signature[0];
        c->ecx = signature[1];
        c->edx = signature[2];

        c = &cpuid_data.entries[cpuid_i++];
        c->function = KVM_CPUID_FEATURES | kvm_base;
        c->eax = env->features[FEAT_KVM];
    }

    cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused);

    for (i = 0; i <= limit; i++) {
        if (cpuid_i == KVM_MAX_CPUID_ENTRIES) {
            fprintf(stderr, "unsupported level value: 0x%x\n", limit);
            abort();
        }
        c = &cpuid_data.entries[cpuid_i++];

        switch (i) {
        case 2: {
            /* Keep reading function 2 till all the input is received */
            int times;

            c->function = i;
            c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC |
                       KVM_CPUID_FLAG_STATE_READ_NEXT;
            cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
            times = c->eax & 0xff;

            for (j = 1; j < times; ++j) {
                if (cpuid_i == KVM_MAX_CPUID_ENTRIES) {
                    fprintf(stderr, "cpuid_data is full, no space for "
                            "cpuid(eax:2):eax & 0xf = 0x%x\n", times);
                    abort();
                }
                c = &cpuid_data.entries[cpuid_i++];
                c->function = i;
                c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC;
                cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
            }
            break;
        }
        case 4:
        case 0xb:
        case 0xd:
            for (j = 0; ; j++) {
                if (i == 0xd && j == 64) {
                    break;
                }
                c->function = i;
                c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
                c->index = j;
                cpu_x86_cpuid(env, i, j, &c->eax, &c->ebx, &c->ecx, &c->edx);

                if (i == 4 && c->eax == 0) {
                    break;
                }
                if (i == 0xb && !(c->ecx & 0xff00)) {
                    break;
                }
                if (i == 0xd && c->eax == 0) {
                    continue;
                }
                if (cpuid_i == KVM_MAX_CPUID_ENTRIES) {
                    fprintf(stderr, "cpuid_data is full, no space for "
                            "cpuid(eax:0x%x,ecx:0x%x)\n", i, j);
                    abort();
                }
                c = &cpuid_data.entries[cpuid_i++];
            }
            break;
        default:
            c->function = i;
            c->flags = 0;
            cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
            break;
        }
    }

    if (limit >= 0x0a) {
        uint32_t ver;

        cpu_x86_cpuid(env, 0x0a, 0, &ver, &unused, &unused, &unused);
        if ((ver & 0xff) > 0) {
            has_msr_architectural_pmu = true;
            num_architectural_pmu_counters = (ver & 0xff00) >> 8;

            /* Shouldn't be more than 32, since that's the number of bits
             * available in EBX to tell us _which_ counters are available.
             * Play it safe.
             */
            if (num_architectural_pmu_counters > MAX_GP_COUNTERS) {
                num_architectural_pmu_counters = MAX_GP_COUNTERS;
            }
        }
    }

    cpu_x86_cpuid(env, 0x80000000, 0, &limit, &unused, &unused, &unused);

    for (i = 0x80000000; i <= limit; i++) {
        if (cpuid_i == KVM_MAX_CPUID_ENTRIES) {
            fprintf(stderr, "unsupported xlevel value: 0x%x\n", limit);
            abort();
        }
        c = &cpuid_data.entries[cpuid_i++];

        c->function = i;
        c->flags = 0;
        cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
    }

    /* Call Centaur's CPUID instructions they are supported. */
    if (env->cpuid_xlevel2 > 0) {
        cpu_x86_cpuid(env, 0xC0000000, 0, &limit, &unused, &unused, &unused);

        for (i = 0xC0000000; i <= limit; i++) {
            if (cpuid_i == KVM_MAX_CPUID_ENTRIES) {
                fprintf(stderr, "unsupported xlevel2 value: 0x%x\n", limit);
                abort();
            }
            c = &cpuid_data.entries[cpuid_i++];

            c->function = i;
            c->flags = 0;
            cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
        }
    }

    cpuid_data.cpuid.nent = cpuid_i;

    if (((env->cpuid_version >> 8)&0xF) >= 6
        && (env->features[FEAT_1_EDX] & (CPUID_MCE | CPUID_MCA)) ==
           (CPUID_MCE | CPUID_MCA)
        && kvm_check_extension(cs->kvm_state, KVM_CAP_MCE) > 0) {
        uint64_t mcg_cap, unsupported_caps;
        int banks;
        int ret;

        ret = kvm_get_mce_cap_supported(cs->kvm_state, &mcg_cap, &banks);
        if (ret < 0) {
            fprintf(stderr, "kvm_get_mce_cap_supported: %s", strerror(-ret));
            return ret;
        }

        if (banks < (env->mcg_cap & MCG_CAP_BANKS_MASK)) {
            error_report("kvm: Unsupported MCE bank count (QEMU = %d, KVM = %d)",
                         (int)(env->mcg_cap & MCG_CAP_BANKS_MASK), banks);
            return -ENOTSUP;
        }

        unsupported_caps = env->mcg_cap & ~(mcg_cap | MCG_CAP_BANKS_MASK);
        if (unsupported_caps) {
            if (unsupported_caps & MCG_LMCE_P) {
                error_report("kvm: LMCE not supported");
                return -ENOTSUP;
            }
            error_report("warning: Unsupported MCG_CAP bits: 0x%" PRIx64,
                         unsupported_caps);
        }

        env->mcg_cap &= mcg_cap | MCG_CAP_BANKS_MASK;
        ret = kvm_vcpu_ioctl(cs, KVM_X86_SETUP_MCE, &env->mcg_cap);
        if (ret < 0) {
            fprintf(stderr, "KVM_X86_SETUP_MCE: %s", strerror(-ret));
            return ret;
        }
    }

    qemu_add_vm_change_state_handler(cpu_update_state, env);

    c = cpuid_find_entry(&cpuid_data.cpuid, 1, 0);
    if (c) {
        has_msr_feature_control = !!(c->ecx & CPUID_EXT_VMX) ||
                                  !!(c->ecx & CPUID_EXT_SMX);
    }

    if (env->mcg_cap & MCG_LMCE_P) {
        has_msr_mcg_ext_ctl = has_msr_feature_control = true;
    }

    if (!env->user_tsc_khz) {
        if ((env->features[FEAT_8000_0007_EDX] & CPUID_APM_INVTSC) &&
            invtsc_mig_blocker == NULL) {
            /* for migration */
            error_setg(&invtsc_mig_blocker,
                       "State blocked by non-migratable CPU device"
                       " (invtsc flag)");
            r = migrate_add_blocker(invtsc_mig_blocker, &local_err);
            if (local_err) {
                error_report_err(local_err);
                error_free(invtsc_mig_blocker);
                goto fail;
            }
            /* for savevm */
            vmstate_x86_cpu.unmigratable = 1;
        }
    }

    r = kvm_arch_set_tsc_khz(cs);
    if (r < 0) {
        goto fail;
    }

    /* vcpu's TSC frequency is either specified by user, or following
     * the value used by KVM if the former is not present. In the
     * latter case, we query it from KVM and record in env->tsc_khz,
     * so that vcpu's TSC frequency can be migrated later via this field.
     */
    if (!env->tsc_khz) {
        r = kvm_check_extension(cs->kvm_state, KVM_CAP_GET_TSC_KHZ) ?
            kvm_vcpu_ioctl(cs, KVM_GET_TSC_KHZ) :
            -ENOTSUP;
        if (r > 0) {
            env->tsc_khz = r;
        }
    }

    if (cpu->vmware_cpuid_freq
        /* Guests depend on 0x40000000 to detect this feature, so only expose
         * it if KVM exposes leaf 0x40000000. (Conflicts with Hyper-V) */
        && cpu->expose_kvm
        && kvm_base == KVM_CPUID_SIGNATURE
        /* TSC clock must be stable and known for this feature. */
        && ((env->features[FEAT_8000_0007_EDX] & CPUID_APM_INVTSC)
            || env->user_tsc_khz != 0)
        && env->tsc_khz != 0) {

        c = &cpuid_data.entries[cpuid_i++];
        c->function = KVM_CPUID_SIGNATURE | 0x10;
        c->eax = env->tsc_khz;
        /* LAPIC resolution of 1ns (freq: 1GHz) is hardcoded in KVM's
         * APIC_BUS_CYCLE_NS */
        c->ebx = 1000000;
        c->ecx = c->edx = 0;

        c = cpuid_find_entry(&cpuid_data.cpuid, kvm_base, 0);
        c->eax = MAX(c->eax, KVM_CPUID_SIGNATURE | 0x10);
    }

    cpuid_data.cpuid.nent = cpuid_i;

    cpuid_data.cpuid.padding = 0;
    r = kvm_vcpu_ioctl(cs, KVM_SET_CPUID2, &cpuid_data);
    if (r) {
        goto fail;
    }

    if (has_xsave) {
        env->kvm_xsave_buf = qemu_memalign(4096, sizeof(struct kvm_xsave));
    }
    cpu->kvm_msr_buf = g_malloc0(MSR_BUF_SIZE);

    if (!(env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_RDTSCP)) {
        has_msr_tsc_aux = false;
    }

    return 0;

 fail:
    migrate_del_blocker(invtsc_mig_blocker);
    return r;
}

void kvm_arch_reset_vcpu(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;

    env->exception_injected = -1;
    env->interrupt_injected = -1;
    env->xcr0 = 1;
    if (kvm_irqchip_in_kernel()) {
        env->mp_state = cpu_is_bsp(cpu) ? KVM_MP_STATE_RUNNABLE :
                                          KVM_MP_STATE_UNINITIALIZED;
    } else {
        env->mp_state = KVM_MP_STATE_RUNNABLE;
    }
}

void kvm_arch_do_init_vcpu(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;

    /* APs get directly into wait-for-SIPI state.  */
    if (env->mp_state == KVM_MP_STATE_UNINITIALIZED) {
        env->mp_state = KVM_MP_STATE_INIT_RECEIVED;
    }
}

static int kvm_get_supported_msrs(KVMState *s)
{
    static int kvm_supported_msrs;
    int ret = 0;

    /* first time */
    if (kvm_supported_msrs == 0) {
        struct kvm_msr_list msr_list, *kvm_msr_list;

        kvm_supported_msrs = -1;

        /* Obtain MSR list from KVM.  These are the MSRs that we must
         * save/restore */
        msr_list.nmsrs = 0;
        ret = kvm_ioctl(s, KVM_GET_MSR_INDEX_LIST, &msr_list);
        if (ret < 0 && ret != -E2BIG) {
            return ret;
        }
        /* Old kernel modules had a bug and could write beyond the provided
           memory. Allocate at least a safe amount of 1K. */
        kvm_msr_list = g_malloc0(MAX(1024, sizeof(msr_list) +
                                              msr_list.nmsrs *
                                              sizeof(msr_list.indices[0])));

        kvm_msr_list->nmsrs = msr_list.nmsrs;
        ret = kvm_ioctl(s, KVM_GET_MSR_INDEX_LIST, kvm_msr_list);
        if (ret >= 0) {
            int i;

            for (i = 0; i < kvm_msr_list->nmsrs; i++) {
                if (kvm_msr_list->indices[i] == MSR_STAR) {
                    has_msr_star = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == MSR_VM_HSAVE_PA) {
                    has_msr_hsave_pa = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == MSR_TSC_AUX) {
                    has_msr_tsc_aux = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == MSR_TSC_ADJUST) {
                    has_msr_tsc_adjust = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == MSR_IA32_TSCDEADLINE) {
                    has_msr_tsc_deadline = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == MSR_IA32_SMBASE) {
                    has_msr_smbase = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == MSR_IA32_MISC_ENABLE) {
                    has_msr_misc_enable = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == MSR_IA32_BNDCFGS) {
                    has_msr_bndcfgs = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == MSR_IA32_XSS) {
                    has_msr_xss = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == HV_X64_MSR_CRASH_CTL) {
                    has_msr_hv_crash = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == HV_X64_MSR_RESET) {
                    has_msr_hv_reset = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == HV_X64_MSR_VP_INDEX) {
                    has_msr_hv_vpindex = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == HV_X64_MSR_VP_RUNTIME) {
                    has_msr_hv_runtime = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == HV_X64_MSR_SCONTROL) {
                    has_msr_hv_synic = true;
                    continue;
                }
                if (kvm_msr_list->indices[i] == HV_X64_MSR_STIMER0_CONFIG) {
                    has_msr_hv_stimer = true;
                    continue;
                }
            }
        }

        g_free(kvm_msr_list);
    }

    return ret;
}

static Notifier smram_machine_done;
static KVMMemoryListener smram_listener;
static AddressSpace smram_address_space;
static MemoryRegion smram_as_root;
static MemoryRegion smram_as_mem;

static void register_smram_listener(Notifier *n, void *unused)
{
    MemoryRegion *smram =
        (MemoryRegion *) object_resolve_path("/machine/smram", NULL);

    /* Outer container... */
    memory_region_init(&smram_as_root, OBJECT(kvm_state), "mem-container-smram", ~0ull);
    memory_region_set_enabled(&smram_as_root, true);

    /* ... with two regions inside: normal system memory with low
     * priority, and...
     */
    memory_region_init_alias(&smram_as_mem, OBJECT(kvm_state), "mem-smram",
                             get_system_memory(), 0, ~0ull);
    memory_region_add_subregion_overlap(&smram_as_root, 0, &smram_as_mem, 0);
    memory_region_set_enabled(&smram_as_mem, true);

    if (smram) {
        /* ... SMRAM with higher priority */
        memory_region_add_subregion_overlap(&smram_as_root, 0, smram, 10);
        memory_region_set_enabled(smram, true);
    }

    address_space_init(&smram_address_space, &smram_as_root, "KVM-SMRAM");
    kvm_memory_listener_register(kvm_state, &smram_listener,
                                 &smram_address_space, 1);
}

int kvm_arch_init(MachineState *ms, KVMState *s)
{
    uint64_t identity_base = 0xfffbc000;
    uint64_t shadow_mem;
    int ret;
    struct utsname utsname;

#ifdef KVM_CAP_XSAVE
    has_xsave = kvm_check_extension(s, KVM_CAP_XSAVE);
#endif

#ifdef KVM_CAP_XCRS
    has_xcrs = kvm_check_extension(s, KVM_CAP_XCRS);
#endif

#ifdef KVM_CAP_PIT_STATE2
    has_pit_state2 = kvm_check_extension(s, KVM_CAP_PIT_STATE2);
#endif

    ret = kvm_get_supported_msrs(s);
    if (ret < 0) {
        return ret;
    }

    uname(&utsname);
    lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0;

    /*
     * On older Intel CPUs, KVM uses vm86 mode to emulate 16-bit code directly.
     * In order to use vm86 mode, an EPT identity map and a TSS  are needed.
     * Since these must be part of guest physical memory, we need to allocate
     * them, both by setting their start addresses in the kernel and by
     * creating a corresponding e820 entry. We need 4 pages before the BIOS.
     *
     * Older KVM versions may not support setting the identity map base. In
     * that case we need to stick with the default, i.e. a 256K maximum BIOS
     * size.
     */
    if (kvm_check_extension(s, KVM_CAP_SET_IDENTITY_MAP_ADDR)) {
        /* Allows up to 16M BIOSes. */
        identity_base = 0xfeffc000;

        ret = kvm_vm_ioctl(s, KVM_SET_IDENTITY_MAP_ADDR, &identity_base);
        if (ret < 0) {
            return ret;
        }
    }

    /* Set TSS base one page after EPT identity map. */
    ret = kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, identity_base + 0x1000);
    if (ret < 0) {
        return ret;
    }

    /* Tell fw_cfg to notify the BIOS to reserve the range. */
    ret = e820_add_entry(identity_base, 0x4000, E820_RESERVED);
    if (ret < 0) {
        fprintf(stderr, "e820_add_entry() table is full\n");
        return ret;
    }
    qemu_register_reset(kvm_unpoison_all, NULL);

    shadow_mem = machine_kvm_shadow_mem(ms);
    if (shadow_mem != -1) {
        shadow_mem /= 4096;
        ret = kvm_vm_ioctl(s, KVM_SET_NR_MMU_PAGES, shadow_mem);
        if (ret < 0) {
            return ret;
        }
    }

    if (kvm_check_extension(s, KVM_CAP_X86_SMM)) {
        smram_machine_done.notify = register_smram_listener;
        qemu_add_machine_init_done_notifier(&smram_machine_done);
    }
    return 0;
}

static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
{
    lhs->selector = rhs->selector;
    lhs->base = rhs->base;
    lhs->limit = rhs->limit;
    lhs->type = 3;
    lhs->present = 1;
    lhs->dpl = 3;
    lhs->db = 0;
    lhs->s = 1;
    lhs->l = 0;
    lhs->g = 0;
    lhs->avl = 0;
    lhs->unusable = 0;
}

static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
{
    unsigned flags = rhs->flags;
    lhs->selector = rhs->selector;
    lhs->base = rhs->base;
    lhs->limit = rhs->limit;
    lhs->type = (flags >> DESC_TYPE_SHIFT) & 15;
    lhs->present = (flags & DESC_P_MASK) != 0;
    lhs->dpl = (flags >> DESC_DPL_SHIFT) & 3;
    lhs->db = (flags >> DESC_B_SHIFT) & 1;
    lhs->s = (flags & DESC_S_MASK) != 0;
    lhs->l = (flags >> DESC_L_SHIFT) & 1;
    lhs->g = (flags & DESC_G_MASK) != 0;
    lhs->avl = (flags & DESC_AVL_MASK) != 0;
    lhs->unusable = !lhs->present;
    lhs->padding = 0;
}

static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs)
{
    lhs->selector = rhs->selector;
    lhs->base = rhs->base;
    lhs->limit = rhs->limit;
    if (rhs->unusable) {
        lhs->flags = 0;
    } else {
        lhs->flags = (rhs->type << DESC_TYPE_SHIFT) |
                     (rhs->present * DESC_P_MASK) |
                     (rhs->dpl << DESC_DPL_SHIFT) |
                     (rhs->db << DESC_B_SHIFT) |
                     (rhs->s * DESC_S_MASK) |
                     (rhs->l << DESC_L_SHIFT) |
                     (rhs->g * DESC_G_MASK) |
                     (rhs->avl * DESC_AVL_MASK);
    }
}

static void kvm_getput_reg(__u64 *kvm_reg, target_ulong *qemu_reg, int set)
{
    if (set) {
        *kvm_reg = *qemu_reg;
    } else {
        *qemu_reg = *kvm_reg;
    }
}

static int kvm_getput_regs(X86CPU *cpu, int set)
{
    CPUX86State *env = &cpu->env;
    struct kvm_regs regs;
    int ret = 0;

    if (!set) {
        ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_REGS, &regs);
        if (ret < 0) {
            return ret;
        }
    }

    kvm_getput_reg(&regs.rax, &env->regs[R_EAX], set);
    kvm_getput_reg(&regs.rbx, &env->regs[R_EBX], set);
    kvm_getput_reg(&regs.rcx, &env->regs[R_ECX], set);
    kvm_getput_reg(&regs.rdx, &env->regs[R_EDX], set);
    kvm_getput_reg(&regs.rsi, &env->regs[R_ESI], set);
    kvm_getput_reg(&regs.rdi, &env->regs[R_EDI], set);
    kvm_getput_reg(&regs.rsp, &env->regs[R_ESP], set);
    kvm_getput_reg(&regs.rbp, &env->regs[R_EBP], set);
#ifdef TARGET_X86_64
    kvm_getput_reg(&regs.r8, &env->regs[8], set);
    kvm_getput_reg(&regs.r9, &env->regs[9], set);
    kvm_getput_reg(&regs.r10, &env->regs[10], set);
    kvm_getput_reg(&regs.r11, &env->regs[11], set);
    kvm_getput_reg(&regs.r12, &env->regs[12], set);
    kvm_getput_reg(&regs.r13, &env->regs[13], set);
    kvm_getput_reg(&regs.r14, &env->regs[14], set);
    kvm_getput_reg(&regs.r15, &env->regs[15], set);
#endif

    kvm_getput_reg(&regs.rflags, &env->eflags, set);
    kvm_getput_reg(&regs.rip, &env->eip, set);

    if (set) {
        ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_REGS, &regs);
    }

    return ret;
}

static int kvm_put_fpu(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_fpu fpu;
    int i;

    memset(&fpu, 0, sizeof fpu);
    fpu.fsw = env->fpus & ~(7 << 11);
    fpu.fsw |= (env->fpstt & 7) << 11;
    fpu.fcw = env->fpuc;
    fpu.last_opcode = env->fpop;
    fpu.last_ip = env->fpip;
    fpu.last_dp = env->fpdp;
    for (i = 0; i < 8; ++i) {
        fpu.ftwx |= (!env->fptags[i]) << i;
    }
    memcpy(fpu.fpr, env->fpregs, sizeof env->fpregs);
    for (i = 0; i < CPU_NB_REGS; i++) {
        stq_p(&fpu.xmm[i][0], env->xmm_regs[i].ZMM_Q(0));
        stq_p(&fpu.xmm[i][8], env->xmm_regs[i].ZMM_Q(1));
    }
    fpu.mxcsr = env->mxcsr;

    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_FPU, &fpu);
}

#define XSAVE_FCW_FSW     0
#define XSAVE_FTW_FOP     1
#define XSAVE_CWD_RIP     2
#define XSAVE_CWD_RDP     4
#define XSAVE_MXCSR       6
#define XSAVE_ST_SPACE    8
#define XSAVE_XMM_SPACE   40
#define XSAVE_XSTATE_BV   128
#define XSAVE_YMMH_SPACE  144
#define XSAVE_BNDREGS     240
#define XSAVE_BNDCSR      256
#define XSAVE_OPMASK      272
#define XSAVE_ZMM_Hi256   288
#define XSAVE_Hi16_ZMM    416
#define XSAVE_PKRU        672

#define XSAVE_BYTE_OFFSET(word_offset) \
    ((word_offset) * sizeof(((struct kvm_xsave *)0)->region[0]))

#define ASSERT_OFFSET(word_offset, field) \
    QEMU_BUILD_BUG_ON(XSAVE_BYTE_OFFSET(word_offset) != \
                      offsetof(X86XSaveArea, field))

ASSERT_OFFSET(XSAVE_FCW_FSW, legacy.fcw);
ASSERT_OFFSET(XSAVE_FTW_FOP, legacy.ftw);
ASSERT_OFFSET(XSAVE_CWD_RIP, legacy.fpip);
ASSERT_OFFSET(XSAVE_CWD_RDP, legacy.fpdp);
ASSERT_OFFSET(XSAVE_MXCSR, legacy.mxcsr);
ASSERT_OFFSET(XSAVE_ST_SPACE, legacy.fpregs);
ASSERT_OFFSET(XSAVE_XMM_SPACE, legacy.xmm_regs);
ASSERT_OFFSET(XSAVE_XSTATE_BV, header.xstate_bv);
ASSERT_OFFSET(XSAVE_YMMH_SPACE, avx_state);
ASSERT_OFFSET(XSAVE_BNDREGS, bndreg_state);
ASSERT_OFFSET(XSAVE_BNDCSR, bndcsr_state);
ASSERT_OFFSET(XSAVE_OPMASK, opmask_state);
ASSERT_OFFSET(XSAVE_ZMM_Hi256, zmm_hi256_state);
ASSERT_OFFSET(XSAVE_Hi16_ZMM, hi16_zmm_state);
ASSERT_OFFSET(XSAVE_PKRU, pkru_state);

static int kvm_put_xsave(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    X86XSaveArea *xsave = env->kvm_xsave_buf;
    uint16_t cwd, swd, twd;
    int i;

    if (!has_xsave) {
        return kvm_put_fpu(cpu);
    }

    memset(xsave, 0, sizeof(struct kvm_xsave));
    twd = 0;
    swd = env->fpus & ~(7 << 11);
    swd |= (env->fpstt & 7) << 11;
    cwd = env->fpuc;
    for (i = 0; i < 8; ++i) {
        twd |= (!env->fptags[i]) << i;
    }
    xsave->legacy.fcw = cwd;
    xsave->legacy.fsw = swd;
    xsave->legacy.ftw = twd;
    xsave->legacy.fpop = env->fpop;
    xsave->legacy.fpip = env->fpip;
    xsave->legacy.fpdp = env->fpdp;
    memcpy(&xsave->legacy.fpregs, env->fpregs,
            sizeof env->fpregs);
    xsave->legacy.mxcsr = env->mxcsr;
    xsave->header.xstate_bv = env->xstate_bv;
    memcpy(&xsave->bndreg_state.bnd_regs, env->bnd_regs,
            sizeof env->bnd_regs);
    xsave->bndcsr_state.bndcsr = env->bndcs_regs;
    memcpy(&xsave->opmask_state.opmask_regs, env->opmask_regs,
            sizeof env->opmask_regs);

    for (i = 0; i < CPU_NB_REGS; i++) {
        uint8_t *xmm = xsave->legacy.xmm_regs[i];
        uint8_t *ymmh = xsave->avx_state.ymmh[i];
        uint8_t *zmmh = xsave->zmm_hi256_state.zmm_hi256[i];
        stq_p(xmm,     env->xmm_regs[i].ZMM_Q(0));
        stq_p(xmm+8,   env->xmm_regs[i].ZMM_Q(1));
        stq_p(ymmh,    env->xmm_regs[i].ZMM_Q(2));
        stq_p(ymmh+8,  env->xmm_regs[i].ZMM_Q(3));
        stq_p(zmmh,    env->xmm_regs[i].ZMM_Q(4));
        stq_p(zmmh+8,  env->xmm_regs[i].ZMM_Q(5));
        stq_p(zmmh+16, env->xmm_regs[i].ZMM_Q(6));
        stq_p(zmmh+24, env->xmm_regs[i].ZMM_Q(7));
    }

#ifdef TARGET_X86_64
    memcpy(&xsave->hi16_zmm_state.hi16_zmm, &env->xmm_regs[16],
            16 * sizeof env->xmm_regs[16]);
    memcpy(&xsave->pkru_state, &env->pkru, sizeof env->pkru);
#endif
    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_XSAVE, xsave);
}

static int kvm_put_xcrs(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_xcrs xcrs = {};

    if (!has_xcrs) {
        return 0;
    }

    xcrs.nr_xcrs = 1;
    xcrs.flags = 0;
    xcrs.xcrs[0].xcr = 0;
    xcrs.xcrs[0].value = env->xcr0;
    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_XCRS, &xcrs);
}

static int kvm_put_sregs(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_sregs sregs;

    memset(sregs.interrupt_bitmap, 0, sizeof(sregs.interrupt_bitmap));
    if (env->interrupt_injected >= 0) {
        sregs.interrupt_bitmap[env->interrupt_injected / 64] |=
                (uint64_t)1 << (env->interrupt_injected % 64);
    }

    if ((env->eflags & VM_MASK)) {
        set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
        set_v8086_seg(&sregs.ds, &env->segs[R_DS]);
        set_v8086_seg(&sregs.es, &env->segs[R_ES]);
        set_v8086_seg(&sregs.fs, &env->segs[R_FS]);
        set_v8086_seg(&sregs.gs, &env->segs[R_GS]);
        set_v8086_seg(&sregs.ss, &env->segs[R_SS]);
    } else {
        set_seg(&sregs.cs, &env->segs[R_CS]);
        set_seg(&sregs.ds, &env->segs[R_DS]);
        set_seg(&sregs.es, &env->segs[R_ES]);
        set_seg(&sregs.fs, &env->segs[R_FS]);
        set_seg(&sregs.gs, &env->segs[R_GS]);
        set_seg(&sregs.ss, &env->segs[R_SS]);
    }

    set_seg(&sregs.tr, &env->tr);
    set_seg(&sregs.ldt, &env->ldt);

    sregs.idt.limit = env->idt.limit;
    sregs.idt.base = env->idt.base;
    memset(sregs.idt.padding, 0, sizeof sregs.idt.padding);
    sregs.gdt.limit = env->gdt.limit;
    sregs.gdt.base = env->gdt.base;
    memset(sregs.gdt.padding, 0, sizeof sregs.gdt.padding);

    sregs.cr0 = env->cr[0];
    sregs.cr2 = env->cr[2];
    sregs.cr3 = env->cr[3];
    sregs.cr4 = env->cr[4];

    sregs.cr8 = cpu_get_apic_tpr(cpu->apic_state);
    sregs.apic_base = cpu_get_apic_base(cpu->apic_state);

    sregs.efer = env->efer;

    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_SREGS, &sregs);
}

static void kvm_msr_buf_reset(X86CPU *cpu)
{
    memset(cpu->kvm_msr_buf, 0, MSR_BUF_SIZE);
}

static void kvm_msr_entry_add(X86CPU *cpu, uint32_t index, uint64_t value)
{
    struct kvm_msrs *msrs = cpu->kvm_msr_buf;
    void *limit = ((void *)msrs) + MSR_BUF_SIZE;
    struct kvm_msr_entry *entry = &msrs->entries[msrs->nmsrs];

    assert((void *)(entry + 1) <= limit);

    entry->index = index;
    entry->reserved = 0;
    entry->data = value;
    msrs->nmsrs++;
}

static int kvm_put_one_msr(X86CPU *cpu, int index, uint64_t value)
{
    kvm_msr_buf_reset(cpu);
    kvm_msr_entry_add(cpu, index, value);

    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MSRS, cpu->kvm_msr_buf);
}

void kvm_put_apicbase(X86CPU *cpu, uint64_t value)
{
    int ret;

    ret = kvm_put_one_msr(cpu, MSR_IA32_APICBASE, value);
    assert(ret == 1);
}

static int kvm_put_tscdeadline_msr(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    int ret;

    if (!has_msr_tsc_deadline) {
        return 0;
    }

    ret = kvm_put_one_msr(cpu, MSR_IA32_TSCDEADLINE, env->tsc_deadline);
    if (ret < 0) {
        return ret;
    }

    assert(ret == 1);
    return 0;
}

/*
 * Provide a separate write service for the feature control MSR in order to
 * kick the VCPU out of VMXON or even guest mode on reset. This has to be done
 * before writing any other state because forcibly leaving nested mode
 * invalidates the VCPU state.
 */
static int kvm_put_msr_feature_control(X86CPU *cpu)
{
    int ret;

    if (!has_msr_feature_control) {
        return 0;
    }

    ret = kvm_put_one_msr(cpu, MSR_IA32_FEATURE_CONTROL,
                          cpu->env.msr_ia32_feature_control);
    if (ret < 0) {
        return ret;
    }

    assert(ret == 1);
    return 0;
}

static int kvm_put_msrs(X86CPU *cpu, int level)
{
    CPUX86State *env = &cpu->env;
    int i;
    int ret;

    kvm_msr_buf_reset(cpu);

    kvm_msr_entry_add(cpu, MSR_IA32_SYSENTER_CS, env->sysenter_cs);
    kvm_msr_entry_add(cpu, MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
    kvm_msr_entry_add(cpu, MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
    kvm_msr_entry_add(cpu, MSR_PAT, env->pat);
    if (has_msr_star) {
        kvm_msr_entry_add(cpu, MSR_STAR, env->star);
    }
    if (has_msr_hsave_pa) {
        kvm_msr_entry_add(cpu, MSR_VM_HSAVE_PA, env->vm_hsave);
    }
    if (has_msr_tsc_aux) {
        kvm_msr_entry_add(cpu, MSR_TSC_AUX, env->tsc_aux);
    }
    if (has_msr_tsc_adjust) {
        kvm_msr_entry_add(cpu, MSR_TSC_ADJUST, env->tsc_adjust);
    }
    if (has_msr_misc_enable) {
        kvm_msr_entry_add(cpu, MSR_IA32_MISC_ENABLE,
                          env->msr_ia32_misc_enable);
    }
    if (has_msr_smbase) {
        kvm_msr_entry_add(cpu, MSR_IA32_SMBASE, env->smbase);
    }
    if (has_msr_bndcfgs) {
        kvm_msr_entry_add(cpu, MSR_IA32_BNDCFGS, env->msr_bndcfgs);
    }
    if (has_msr_xss) {
        kvm_msr_entry_add(cpu, MSR_IA32_XSS, env->xss);
    }
#ifdef TARGET_X86_64
    if (lm_capable_kernel) {
        kvm_msr_entry_add(cpu, MSR_CSTAR, env->cstar);
        kvm_msr_entry_add(cpu, MSR_KERNELGSBASE, env->kernelgsbase);
        kvm_msr_entry_add(cpu, MSR_FMASK, env->fmask);
        kvm_msr_entry_add(cpu, MSR_LSTAR, env->lstar);
    }
#endif
    /*
     * The following MSRs have side effects on the guest or are too heavy
     * for normal writeback. Limit them to reset or full state updates.
     */
    if (level >= KVM_PUT_RESET_STATE) {
        kvm_msr_entry_add(cpu, MSR_IA32_TSC, env->tsc);
        kvm_msr_entry_add(cpu, MSR_KVM_SYSTEM_TIME, env->system_time_msr);
        kvm_msr_entry_add(cpu, MSR_KVM_WALL_CLOCK, env->wall_clock_msr);
        if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF)) {
            kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, env->async_pf_en_msr);
        }
        if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_PV_EOI)) {
            kvm_msr_entry_add(cpu, MSR_KVM_PV_EOI_EN, env->pv_eoi_en_msr);
        }
        if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_STEAL_TIME)) {
            kvm_msr_entry_add(cpu, MSR_KVM_STEAL_TIME, env->steal_time_msr);
        }
        if (has_msr_architectural_pmu) {
            /* Stop the counter.  */
            kvm_msr_entry_add(cpu, MSR_CORE_PERF_FIXED_CTR_CTRL, 0);
            kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_CTRL, 0);

            /* Set the counter values.  */
            for (i = 0; i < MAX_FIXED_COUNTERS; i++) {
                kvm_msr_entry_add(cpu, MSR_CORE_PERF_FIXED_CTR0 + i,
                                  env->msr_fixed_counters[i]);
            }
            for (i = 0; i < num_architectural_pmu_counters; i++) {
                kvm_msr_entry_add(cpu, MSR_P6_PERFCTR0 + i,
                                  env->msr_gp_counters[i]);
                kvm_msr_entry_add(cpu, MSR_P6_EVNTSEL0 + i,
                                  env->msr_gp_evtsel[i]);
            }
            kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_STATUS,
                              env->msr_global_status);
            kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_OVF_CTRL,
                              env->msr_global_ovf_ctrl);

            /* Now start the PMU.  */
            kvm_msr_entry_add(cpu, MSR_CORE_PERF_FIXED_CTR_CTRL,
                              env->msr_fixed_ctr_ctrl);
            kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_CTRL,
                              env->msr_global_ctrl);
        }
        if (has_msr_hv_hypercall) {
            kvm_msr_entry_add(cpu, HV_X64_MSR_GUEST_OS_ID,
                              env->msr_hv_guest_os_id);
            kvm_msr_entry_add(cpu, HV_X64_MSR_HYPERCALL,
                              env->msr_hv_hypercall);
        }
        if (cpu->hyperv_vapic) {
            kvm_msr_entry_add(cpu, HV_X64_MSR_APIC_ASSIST_PAGE,
                              env->msr_hv_vapic);
        }
        if (cpu->hyperv_time) {
            kvm_msr_entry_add(cpu, HV_X64_MSR_REFERENCE_TSC, env->msr_hv_tsc);
        }
        if (has_msr_hv_crash) {
            int j;

            for (j = 0; j < HV_X64_MSR_CRASH_PARAMS; j++)
                kvm_msr_entry_add(cpu, HV_X64_MSR_CRASH_P0 + j,
                                  env->msr_hv_crash_params[j]);

            kvm_msr_entry_add(cpu, HV_X64_MSR_CRASH_CTL,
                              HV_X64_MSR_CRASH_CTL_NOTIFY);
        }
        if (has_msr_hv_runtime) {
            kvm_msr_entry_add(cpu, HV_X64_MSR_VP_RUNTIME, env->msr_hv_runtime);
        }
        if (cpu->hyperv_synic) {
            int j;

            kvm_msr_entry_add(cpu, HV_X64_MSR_SCONTROL,
                              env->msr_hv_synic_control);
            kvm_msr_entry_add(cpu, HV_X64_MSR_SVERSION,
                              env->msr_hv_synic_version);
            kvm_msr_entry_add(cpu, HV_X64_MSR_SIEFP,
                              env->msr_hv_synic_evt_page);
            kvm_msr_entry_add(cpu, HV_X64_MSR_SIMP,
                              env->msr_hv_synic_msg_page);

            for (j = 0; j < ARRAY_SIZE(env->msr_hv_synic_sint); j++) {
                kvm_msr_entry_add(cpu, HV_X64_MSR_SINT0 + j,
                                  env->msr_hv_synic_sint[j]);
            }
        }
        if (has_msr_hv_stimer) {
            int j;

            for (j = 0; j < ARRAY_SIZE(env->msr_hv_stimer_config); j++) {
                kvm_msr_entry_add(cpu, HV_X64_MSR_STIMER0_CONFIG + j * 2,
                                env->msr_hv_stimer_config[j]);
            }

            for (j = 0; j < ARRAY_SIZE(env->msr_hv_stimer_count); j++) {
                kvm_msr_entry_add(cpu, HV_X64_MSR_STIMER0_COUNT + j * 2,
                                env->msr_hv_stimer_count[j]);
            }
        }
        if (env->features[FEAT_1_EDX] & CPUID_MTRR) {
            uint64_t phys_mask = MAKE_64BIT_MASK(0, cpu->phys_bits);

            kvm_msr_entry_add(cpu, MSR_MTRRdefType, env->mtrr_deftype);
            kvm_msr_entry_add(cpu, MSR_MTRRfix64K_00000, env->mtrr_fixed[0]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix16K_80000, env->mtrr_fixed[1]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix16K_A0000, env->mtrr_fixed[2]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix4K_C0000, env->mtrr_fixed[3]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix4K_C8000, env->mtrr_fixed[4]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix4K_D0000, env->mtrr_fixed[5]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix4K_D8000, env->mtrr_fixed[6]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix4K_E0000, env->mtrr_fixed[7]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix4K_E8000, env->mtrr_fixed[8]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix4K_F0000, env->mtrr_fixed[9]);
            kvm_msr_entry_add(cpu, MSR_MTRRfix4K_F8000, env->mtrr_fixed[10]);
            for (i = 0; i < MSR_MTRRcap_VCNT; i++) {
                /* The CPU GPs if we write to a bit above the physical limit of
                 * the host CPU (and KVM emulates that)
                 */
                uint64_t mask = env->mtrr_var[i].mask;
                mask &= phys_mask;

                kvm_msr_entry_add(cpu, MSR_MTRRphysBase(i),
                                  env->mtrr_var[i].base);
                kvm_msr_entry_add(cpu, MSR_MTRRphysMask(i), mask);
            }
        }

        /* Note: MSR_IA32_FEATURE_CONTROL is written separately, see
         *       kvm_put_msr_feature_control. */
    }
    if (env->mcg_cap) {
        int i;

        kvm_msr_entry_add(cpu, MSR_MCG_STATUS, env->mcg_status);
        kvm_msr_entry_add(cpu, MSR_MCG_CTL, env->mcg_ctl);
        if (has_msr_mcg_ext_ctl) {
            kvm_msr_entry_add(cpu, MSR_MCG_EXT_CTL, env->mcg_ext_ctl);
        }
        for (i = 0; i < (env->mcg_cap & 0xff) * 4; i++) {
            kvm_msr_entry_add(cpu, MSR_MC0_CTL + i, env->mce_banks[i]);
        }
    }

    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MSRS, cpu->kvm_msr_buf);
    if (ret < 0) {
        return ret;
    }

    assert(ret == cpu->kvm_msr_buf->nmsrs);
    return 0;
}


static int kvm_get_fpu(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_fpu fpu;
    int i, ret;

    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_FPU, &fpu);
    if (ret < 0) {
        return ret;
    }

    env->fpstt = (fpu.fsw >> 11) & 7;
    env->fpus = fpu.fsw;
    env->fpuc = fpu.fcw;
    env->fpop = fpu.last_opcode;
    env->fpip = fpu.last_ip;
    env->fpdp = fpu.last_dp;
    for (i = 0; i < 8; ++i) {
        env->fptags[i] = !((fpu.ftwx >> i) & 1);
    }
    memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs);
    for (i = 0; i < CPU_NB_REGS; i++) {
        env->xmm_regs[i].ZMM_Q(0) = ldq_p(&fpu.xmm[i][0]);
        env->xmm_regs[i].ZMM_Q(1) = ldq_p(&fpu.xmm[i][8]);
    }
    env->mxcsr = fpu.mxcsr;

    return 0;
}

static int kvm_get_xsave(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    X86XSaveArea *xsave = env->kvm_xsave_buf;
    int ret, i;
    uint16_t cwd, swd, twd;

    if (!has_xsave) {
        return kvm_get_fpu(cpu);
    }

    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_XSAVE, xsave);
    if (ret < 0) {
        return ret;
    }

    cwd = xsave->legacy.fcw;
    swd = xsave->legacy.fsw;
    twd = xsave->legacy.ftw;
    env->fpop = xsave->legacy.fpop;
    env->fpstt = (swd >> 11) & 7;
    env->fpus = swd;
    env->fpuc = cwd;
    for (i = 0; i < 8; ++i) {
        env->fptags[i] = !((twd >> i) & 1);
    }
    env->fpip = xsave->legacy.fpip;
    env->fpdp = xsave->legacy.fpdp;
    env->mxcsr = xsave->legacy.mxcsr;
    memcpy(env->fpregs, &xsave->legacy.fpregs,
            sizeof env->fpregs);
    env->xstate_bv = xsave->header.xstate_bv;
    memcpy(env->bnd_regs, &xsave->bndreg_state.bnd_regs,
            sizeof env->bnd_regs);
    env->bndcs_regs = xsave->bndcsr_state.bndcsr;
    memcpy(env->opmask_regs, &xsave->opmask_state.opmask_regs,
            sizeof env->opmask_regs);

    for (i = 0; i < CPU_NB_REGS; i++) {
        uint8_t *xmm = xsave->legacy.xmm_regs[i];
        uint8_t *ymmh = xsave->avx_state.ymmh[i];
        uint8_t *zmmh = xsave->zmm_hi256_state.zmm_hi256[i];
        env->xmm_regs[i].ZMM_Q(0) = ldq_p(xmm);
        env->xmm_regs[i].ZMM_Q(1) = ldq_p(xmm+8);
        env->xmm_regs[i].ZMM_Q(2) = ldq_p(ymmh);
        env->xmm_regs[i].ZMM_Q(3) = ldq_p(ymmh+8);
        env->xmm_regs[i].ZMM_Q(4) = ldq_p(zmmh);
        env->xmm_regs[i].ZMM_Q(5) = ldq_p(zmmh+8);
        env->xmm_regs[i].ZMM_Q(6) = ldq_p(zmmh+16);
        env->xmm_regs[i].ZMM_Q(7) = ldq_p(zmmh+24);
    }

#ifdef TARGET_X86_64
    memcpy(&env->xmm_regs[16], &xsave->hi16_zmm_state.hi16_zmm,
           16 * sizeof env->xmm_regs[16]);
    memcpy(&env->pkru, &xsave->pkru_state, sizeof env->pkru);
#endif
    return 0;
}

static int kvm_get_xcrs(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    int i, ret;
    struct kvm_xcrs xcrs;

    if (!has_xcrs) {
        return 0;
    }

    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_XCRS, &xcrs);
    if (ret < 0) {
        return ret;
    }

    for (i = 0; i < xcrs.nr_xcrs; i++) {
        /* Only support xcr0 now */
        if (xcrs.xcrs[i].xcr == 0) {
            env->xcr0 = xcrs.xcrs[i].value;
            break;
        }
    }
    return 0;
}

static int kvm_get_sregs(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_sregs sregs;
    uint32_t hflags;
    int bit, i, ret;

    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_SREGS, &sregs);
    if (ret < 0) {
        return ret;
    }

    /* There can only be one pending IRQ set in the bitmap at a time, so try
       to find it and save its number instead (-1 for none). */
    env->interrupt_injected = -1;
    for (i = 0; i < ARRAY_SIZE(sregs.interrupt_bitmap); i++) {
        if (sregs.interrupt_bitmap[i]) {
            bit = ctz64(sregs.interrupt_bitmap[i]);
            env->interrupt_injected = i * 64 + bit;
            break;
        }
    }

    get_seg(&env->segs[R_CS], &sregs.cs);
    get_seg(&env->segs[R_DS], &sregs.ds);
    get_seg(&env->segs[R_ES], &sregs.es);
    get_seg(&env->segs[R_FS], &sregs.fs);
    get_seg(&env->segs[R_GS], &sregs.gs);
    get_seg(&env->segs[R_SS], &sregs.ss);

    get_seg(&env->tr, &sregs.tr);
    get_seg(&env->ldt, &sregs.ldt);

    env->idt.limit = sregs.idt.limit;
    env->idt.base = sregs.idt.base;
    env->gdt.limit = sregs.gdt.limit;
    env->gdt.base = sregs.gdt.base;

    env->cr[0] = sregs.cr0;
    env->cr[2] = sregs.cr2;
    env->cr[3] = sregs.cr3;
    env->cr[4] = sregs.cr4;

    env->efer = sregs.efer;

    /* changes to apic base and cr8/tpr are read back via kvm_arch_post_run */

#define HFLAG_COPY_MASK \
    ~( HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \
       HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \
       HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \
       HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)

    hflags = env->hflags & HFLAG_COPY_MASK;
    hflags |= (env->segs[R_SS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
    hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT);
    hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) &
                (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK);
    hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK));

    if (env->cr[4] & CR4_OSFXSR_MASK) {
        hflags |= HF_OSFXSR_MASK;
    }

    if (env->efer & MSR_EFER_LMA) {
        hflags |= HF_LMA_MASK;
    }

    if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) {
        hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
    } else {
        hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >>
                    (DESC_B_SHIFT - HF_CS32_SHIFT);
        hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >>
                    (DESC_B_SHIFT - HF_SS32_SHIFT);
        if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK) ||
            !(hflags & HF_CS32_MASK)) {
            hflags |= HF_ADDSEG_MASK;
        } else {
            hflags |= ((env->segs[R_DS].base | env->segs[R_ES].base |
                        env->segs[R_SS].base) != 0) << HF_ADDSEG_SHIFT;
        }
    }
    env->hflags = hflags;

    return 0;
}

static int kvm_get_msrs(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_msr_entry *msrs = cpu->kvm_msr_buf->entries;
    int ret, i;
    uint64_t mtrr_top_bits;

    kvm_msr_buf_reset(cpu);

    kvm_msr_entry_add(cpu, MSR_IA32_SYSENTER_CS, 0);
    kvm_msr_entry_add(cpu, MSR_IA32_SYSENTER_ESP, 0);
    kvm_msr_entry_add(cpu, MSR_IA32_SYSENTER_EIP, 0);
    kvm_msr_entry_add(cpu, MSR_PAT, 0);
    if (has_msr_star) {
        kvm_msr_entry_add(cpu, MSR_STAR, 0);
    }
    if (has_msr_hsave_pa) {
        kvm_msr_entry_add(cpu, MSR_VM_HSAVE_PA, 0);
    }
    if (has_msr_tsc_aux) {
        kvm_msr_entry_add(cpu, MSR_TSC_AUX, 0);
    }
    if (has_msr_tsc_adjust) {
        kvm_msr_entry_add(cpu, MSR_TSC_ADJUST, 0);
    }
    if (has_msr_tsc_deadline) {
        kvm_msr_entry_add(cpu, MSR_IA32_TSCDEADLINE, 0);
    }
    if (has_msr_misc_enable) {
        kvm_msr_entry_add(cpu, MSR_IA32_MISC_ENABLE, 0);
    }
    if (has_msr_smbase) {
        kvm_msr_entry_add(cpu, MSR_IA32_SMBASE, 0);
    }
    if (has_msr_feature_control) {
        kvm_msr_entry_add(cpu, MSR_IA32_FEATURE_CONTROL, 0);
    }
    if (has_msr_bndcfgs) {
        kvm_msr_entry_add(cpu, MSR_IA32_BNDCFGS, 0);
    }
    if (has_msr_xss) {
        kvm_msr_entry_add(cpu, MSR_IA32_XSS, 0);
    }


    if (!env->tsc_valid) {
        kvm_msr_entry_add(cpu, MSR_IA32_TSC, 0);
        env->tsc_valid = !runstate_is_running();
    }

#ifdef TARGET_X86_64
    if (lm_capable_kernel) {
        kvm_msr_entry_add(cpu, MSR_CSTAR, 0);
        kvm_msr_entry_add(cpu, MSR_KERNELGSBASE, 0);
        kvm_msr_entry_add(cpu, MSR_FMASK, 0);
        kvm_msr_entry_add(cpu, MSR_LSTAR, 0);
    }
#endif
    kvm_msr_entry_add(cpu, MSR_KVM_SYSTEM_TIME, 0);
    kvm_msr_entry_add(cpu, MSR_KVM_WALL_CLOCK, 0);
    if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF)) {
        kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, 0);
    }
    if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_PV_EOI)) {
        kvm_msr_entry_add(cpu, MSR_KVM_PV_EOI_EN, 0);
    }
    if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_STEAL_TIME)) {
        kvm_msr_entry_add(cpu, MSR_KVM_STEAL_TIME, 0);
    }
    if (has_msr_architectural_pmu) {
        kvm_msr_entry_add(cpu, MSR_CORE_PERF_FIXED_CTR_CTRL, 0);
        kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_CTRL, 0);
        kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_STATUS, 0);
        kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_OVF_CTRL, 0);
        for (i = 0; i < MAX_FIXED_COUNTERS; i++) {
            kvm_msr_entry_add(cpu, MSR_CORE_PERF_FIXED_CTR0 + i, 0);
        }
        for (i = 0; i < num_architectural_pmu_counters; i++) {
            kvm_msr_entry_add(cpu, MSR_P6_PERFCTR0 + i, 0);
            kvm_msr_entry_add(cpu, MSR_P6_EVNTSEL0 + i, 0);
        }
    }

    if (env->mcg_cap) {
        kvm_msr_entry_add(cpu, MSR_MCG_STATUS, 0);
        kvm_msr_entry_add(cpu, MSR_MCG_CTL, 0);
        if (has_msr_mcg_ext_ctl) {
            kvm_msr_entry_add(cpu, MSR_MCG_EXT_CTL, 0);
        }
        for (i = 0; i < (env->mcg_cap & 0xff) * 4; i++) {
            kvm_msr_entry_add(cpu, MSR_MC0_CTL + i, 0);
        }
    }

    if (has_msr_hv_hypercall) {
        kvm_msr_entry_add(cpu, HV_X64_MSR_HYPERCALL, 0);
        kvm_msr_entry_add(cpu, HV_X64_MSR_GUEST_OS_ID, 0);
    }
    if (cpu->hyperv_vapic) {
        kvm_msr_entry_add(cpu, HV_X64_MSR_APIC_ASSIST_PAGE, 0);
    }
    if (cpu->hyperv_time) {
        kvm_msr_entry_add(cpu, HV_X64_MSR_REFERENCE_TSC, 0);
    }
    if (has_msr_hv_crash) {
        int j;

        for (j = 0; j < HV_X64_MSR_CRASH_PARAMS; j++) {
            kvm_msr_entry_add(cpu, HV_X64_MSR_CRASH_P0 + j, 0);
        }
    }
    if (has_msr_hv_runtime) {
        kvm_msr_entry_add(cpu, HV_X64_MSR_VP_RUNTIME, 0);
    }
    if (cpu->hyperv_synic) {
        uint32_t msr;

        kvm_msr_entry_add(cpu, HV_X64_MSR_SCONTROL, 0);
        kvm_msr_entry_add(cpu, HV_X64_MSR_SVERSION, 0);
        kvm_msr_entry_add(cpu, HV_X64_MSR_SIEFP, 0);
        kvm_msr_entry_add(cpu, HV_X64_MSR_SIMP, 0);
        for (msr = HV_X64_MSR_SINT0; msr <= HV_X64_MSR_SINT15; msr++) {
            kvm_msr_entry_add(cpu, msr, 0);
        }
    }
    if (has_msr_hv_stimer) {
        uint32_t msr;

        for (msr = HV_X64_MSR_STIMER0_CONFIG; msr <= HV_X64_MSR_STIMER3_COUNT;
             msr++) {
            kvm_msr_entry_add(cpu, msr, 0);
        }
    }
    if (env->features[FEAT_1_EDX] & CPUID_MTRR) {
        kvm_msr_entry_add(cpu, MSR_MTRRdefType, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix64K_00000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix16K_80000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix16K_A0000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix4K_C0000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix4K_C8000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix4K_D0000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix4K_D8000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix4K_E0000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix4K_E8000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix4K_F0000, 0);
        kvm_msr_entry_add(cpu, MSR_MTRRfix4K_F8000, 0);
        for (i = 0; i < MSR_MTRRcap_VCNT; i++) {
            kvm_msr_entry_add(cpu, MSR_MTRRphysBase(i), 0);
            kvm_msr_entry_add(cpu, MSR_MTRRphysMask(i), 0);
        }
    }

    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, cpu->kvm_msr_buf);
    if (ret < 0) {
        return ret;
    }

    assert(ret == cpu->kvm_msr_buf->nmsrs);
    /*
     * MTRR masks: Each mask consists of 5 parts
     * a  10..0: must be zero
     * b  11   : valid bit
     * c n-1.12: actual mask bits
     * d  51..n: reserved must be zero
     * e  63.52: reserved must be zero
     *
     * 'n' is the number of physical bits supported by the CPU and is
     * apparently always <= 52.   We know our 'n' but don't know what
     * the destinations 'n' is; it might be smaller, in which case
     * it masks (c) on loading. It might be larger, in which case
     * we fill 'd' so that d..c is consistent irrespetive of the 'n'
     * we're migrating to.
     */

    if (cpu->fill_mtrr_mask) {
        QEMU_BUILD_BUG_ON(TARGET_PHYS_ADDR_SPACE_BITS > 52);
        assert(cpu->phys_bits <= TARGET_PHYS_ADDR_SPACE_BITS);
        mtrr_top_bits = MAKE_64BIT_MASK(cpu->phys_bits, 52 - cpu->phys_bits);
    } else {
        mtrr_top_bits = 0;
    }

    for (i = 0; i < ret; i++) {
        uint32_t index = msrs[i].index;
        switch (index) {
        case MSR_IA32_SYSENTER_CS:
            env->sysenter_cs = msrs[i].data;
            break;
        case MSR_IA32_SYSENTER_ESP:
            env->sysenter_esp = msrs[i].data;
            break;
        case MSR_IA32_SYSENTER_EIP:
            env->sysenter_eip = msrs[i].data;
            break;
        case MSR_PAT:
            env->pat = msrs[i].data;
            break;
        case MSR_STAR:
            env->star = msrs[i].data;
            break;
#ifdef TARGET_X86_64
        case MSR_CSTAR:
            env->cstar = msrs[i].data;
            break;
        case MSR_KERNELGSBASE:
            env->kernelgsbase = msrs[i].data;
            break;
        case MSR_FMASK:
            env->fmask = msrs[i].data;
            break;
        case MSR_LSTAR:
            env->lstar = msrs[i].data;
            break;
#endif
        case MSR_IA32_TSC:
            env->tsc = msrs[i].data;
            break;
        case MSR_TSC_AUX:
            env->tsc_aux = msrs[i].data;
            break;
        case MSR_TSC_ADJUST:
            env->tsc_adjust = msrs[i].data;
            break;
        case MSR_IA32_TSCDEADLINE:
            env->tsc_deadline = msrs[i].data;
            break;
        case MSR_VM_HSAVE_PA:
            env->vm_hsave = msrs[i].data;
            break;
        case MSR_KVM_SYSTEM_TIME:
            env->system_time_msr = msrs[i].data;
            break;
        case MSR_KVM_WALL_CLOCK:
            env->wall_clock_msr = msrs[i].data;
            break;
        case MSR_MCG_STATUS:
            env->mcg_status = msrs[i].data;
            break;
        case MSR_MCG_CTL:
            env->mcg_ctl = msrs[i].data;
            break;
        case MSR_MCG_EXT_CTL:
            env->mcg_ext_ctl = msrs[i].data;
            break;
        case MSR_IA32_MISC_ENABLE:
            env->msr_ia32_misc_enable = msrs[i].data;
            break;
        case MSR_IA32_SMBASE:
            env->smbase = msrs[i].data;
            break;
        case MSR_IA32_FEATURE_CONTROL:
            env->msr_ia32_feature_control = msrs[i].data;
            break;
        case MSR_IA32_BNDCFGS:
            env->msr_bndcfgs = msrs[i].data;
            break;
        case MSR_IA32_XSS:
            env->xss = msrs[i].data;
            break;
        default:
            if (msrs[i].index >= MSR_MC0_CTL &&
                msrs[i].index < MSR_MC0_CTL + (env->mcg_cap & 0xff) * 4) {
                env->mce_banks[msrs[i].index - MSR_MC0_CTL] = msrs[i].data;
            }
            break;
        case MSR_KVM_ASYNC_PF_EN:
            env->async_pf_en_msr = msrs[i].data;
            break;
        case MSR_KVM_PV_EOI_EN:
            env->pv_eoi_en_msr = msrs[i].data;
            break;
        case MSR_KVM_STEAL_TIME:
            env->steal_time_msr = msrs[i].data;
            break;
        case MSR_CORE_PERF_FIXED_CTR_CTRL:
            env->msr_fixed_ctr_ctrl = msrs[i].data;
            break;
        case MSR_CORE_PERF_GLOBAL_CTRL:
            env->msr_global_ctrl = msrs[i].data;
            break;
        case MSR_CORE_PERF_GLOBAL_STATUS:
            env->msr_global_status = msrs[i].data;
            break;
        case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
            env->msr_global_ovf_ctrl = msrs[i].data;
            break;
        case MSR_CORE_PERF_FIXED_CTR0 ... MSR_CORE_PERF_FIXED_CTR0 + MAX_FIXED_COUNTERS - 1:
            env->msr_fixed_counters[index - MSR_CORE_PERF_FIXED_CTR0] = msrs[i].data;
            break;
        case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR0 + MAX_GP_COUNTERS - 1:
            env->msr_gp_counters[index - MSR_P6_PERFCTR0] = msrs[i].data;
            break;
        case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL0 + MAX_GP_COUNTERS - 1:
            env->msr_gp_evtsel[index - MSR_P6_EVNTSEL0] = msrs[i].data;
            break;
        case HV_X64_MSR_HYPERCALL:
            env->msr_hv_hypercall = msrs[i].data;
            break;
        case HV_X64_MSR_GUEST_OS_ID:
            env->msr_hv_guest_os_id = msrs[i].data;
            break;
        case HV_X64_MSR_APIC_ASSIST_PAGE:
            env->msr_hv_vapic = msrs[i].data;
            break;
        case HV_X64_MSR_REFERENCE_TSC:
            env->msr_hv_tsc = msrs[i].data;
            break;
        case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
            env->msr_hv_crash_params[index - HV_X64_MSR_CRASH_P0] = msrs[i].data;
            break;
        case HV_X64_MSR_VP_RUNTIME:
            env->msr_hv_runtime = msrs[i].data;
            break;
        case HV_X64_MSR_SCONTROL:
            env->msr_hv_synic_control = msrs[i].data;
            break;
        case HV_X64_MSR_SVERSION:
            env->msr_hv_synic_version = msrs[i].data;
            break;
        case HV_X64_MSR_SIEFP:
            env->msr_hv_synic_evt_page = msrs[i].data;
            break;
        case HV_X64_MSR_SIMP:
            env->msr_hv_synic_msg_page = msrs[i].data;
            break;
        case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
            env->msr_hv_synic_sint[index - HV_X64_MSR_SINT0] = msrs[i].data;
            break;
        case HV_X64_MSR_STIMER0_CONFIG:
        case HV_X64_MSR_STIMER1_CONFIG:
        case HV_X64_MSR_STIMER2_CONFIG:
        case HV_X64_MSR_STIMER3_CONFIG:
            env->msr_hv_stimer_config[(index - HV_X64_MSR_STIMER0_CONFIG)/2] =
                                msrs[i].data;
            break;
        case HV_X64_MSR_STIMER0_COUNT:
        case HV_X64_MSR_STIMER1_COUNT:
        case HV_X64_MSR_STIMER2_COUNT:
        case HV_X64_MSR_STIMER3_COUNT:
            env->msr_hv_stimer_count[(index - HV_X64_MSR_STIMER0_COUNT)/2] =
                                msrs[i].data;
            break;
        case MSR_MTRRdefType:
            env->mtrr_deftype = msrs[i].data;
            break;
        case MSR_MTRRfix64K_00000:
            env->mtrr_fixed[0] = msrs[i].data;
            break;
        case MSR_MTRRfix16K_80000:
            env->mtrr_fixed[1] = msrs[i].data;
            break;
        case MSR_MTRRfix16K_A0000:
            env->mtrr_fixed[2] = msrs[i].data;
            break;
        case MSR_MTRRfix4K_C0000:
            env->mtrr_fixed[3] = msrs[i].data;
            break;
        case MSR_MTRRfix4K_C8000:
            env->mtrr_fixed[4] = msrs[i].data;
            break;
        case MSR_MTRRfix4K_D0000:
            env->mtrr_fixed[5] = msrs[i].data;
            break;
        case MSR_MTRRfix4K_D8000:
            env->mtrr_fixed[6] = msrs[i].data;
            break;
        case MSR_MTRRfix4K_E0000:
            env->mtrr_fixed[7] = msrs[i].data;
            break;
        case MSR_MTRRfix4K_E8000:
            env->mtrr_fixed[8] = msrs[i].data;
            break;
        case MSR_MTRRfix4K_F0000:
            env->mtrr_fixed[9] = msrs[i].data;
            break;
        case MSR_MTRRfix4K_F8000:
            env->mtrr_fixed[10] = msrs[i].data;
            break;
        case MSR_MTRRphysBase(0) ... MSR_MTRRphysMask(MSR_MTRRcap_VCNT - 1):
            if (index & 1) {
                env->mtrr_var[MSR_MTRRphysIndex(index)].mask = msrs[i].data |
                                                               mtrr_top_bits;
            } else {
                env->mtrr_var[MSR_MTRRphysIndex(index)].base = msrs[i].data;
            }
            break;
        }
    }

    return 0;
}

static int kvm_put_mp_state(X86CPU *cpu)
{
    struct kvm_mp_state mp_state = { .mp_state = cpu->env.mp_state };

    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
}

static int kvm_get_mp_state(X86CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    CPUX86State *env = &cpu->env;
    struct kvm_mp_state mp_state;
    int ret;

    ret = kvm_vcpu_ioctl(cs, KVM_GET_MP_STATE, &mp_state);
    if (ret < 0) {
        return ret;
    }
    env->mp_state = mp_state.mp_state;
    if (kvm_irqchip_in_kernel()) {
        cs->halted = (mp_state.mp_state == KVM_MP_STATE_HALTED);
    }
    return 0;
}

static int kvm_get_apic(X86CPU *cpu)
{
    DeviceState *apic = cpu->apic_state;
    struct kvm_lapic_state kapic;
    int ret;

    if (apic && kvm_irqchip_in_kernel()) {
        ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_LAPIC, &kapic);
        if (ret < 0) {
            return ret;
        }

        kvm_get_apic_state(apic, &kapic);
    }
    return 0;
}

static int kvm_put_vcpu_events(X86CPU *cpu, int level)
{
    CPUState *cs = CPU(cpu);
    CPUX86State *env = &cpu->env;
    struct kvm_vcpu_events events = {};

    if (!kvm_has_vcpu_events()) {
        return 0;
    }

    events.exception.injected = (env->exception_injected >= 0);
    events.exception.nr = env->exception_injected;
    events.exception.has_error_code = env->has_error_code;
    events.exception.error_code = env->error_code;
    events.exception.pad = 0;

    events.interrupt.injected = (env->interrupt_injected >= 0);
    events.interrupt.nr = env->interrupt_injected;
    events.interrupt.soft = env->soft_interrupt;

    events.nmi.injected = env->nmi_injected;
    events.nmi.pending = env->nmi_pending;
    events.nmi.masked = !!(env->hflags2 & HF2_NMI_MASK);
    events.nmi.pad = 0;

    events.sipi_vector = env->sipi_vector;
    events.flags = 0;

    if (has_msr_smbase) {
        events.smi.smm = !!(env->hflags & HF_SMM_MASK);
        events.smi.smm_inside_nmi = !!(env->hflags2 & HF2_SMM_INSIDE_NMI_MASK);
        if (kvm_irqchip_in_kernel()) {
            /* As soon as these are moved to the kernel, remove them
             * from cs->interrupt_request.
             */
            events.smi.pending = cs->interrupt_request & CPU_INTERRUPT_SMI;
            events.smi.latched_init = cs->interrupt_request & CPU_INTERRUPT_INIT;
            cs->interrupt_request &= ~(CPU_INTERRUPT_INIT | CPU_INTERRUPT_SMI);
        } else {
            /* Keep these in cs->interrupt_request.  */
            events.smi.pending = 0;
            events.smi.latched_init = 0;
        }
        events.flags |= KVM_VCPUEVENT_VALID_SMM;
    }

    if (level >= KVM_PUT_RESET_STATE) {
        events.flags |=
            KVM_VCPUEVENT_VALID_NMI_PENDING | KVM_VCPUEVENT_VALID_SIPI_VECTOR;
    }

    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events);
}

static int kvm_get_vcpu_events(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_vcpu_events events;
    int ret;

    if (!kvm_has_vcpu_events()) {
        return 0;
    }

    memset(&events, 0, sizeof(events));
    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events);
    if (ret < 0) {
       return ret;
    }
    env->exception_injected =
       events.exception.injected ? events.exception.nr : -1;
    env->has_error_code = events.exception.has_error_code;
    env->error_code = events.exception.error_code;

    env->interrupt_injected =
        events.interrupt.injected ? events.interrupt.nr : -1;
    env->soft_interrupt = events.interrupt.soft;

    env->nmi_injected = events.nmi.injected;
    env->nmi_pending = events.nmi.pending;
    if (events.nmi.masked) {
        env->hflags2 |= HF2_NMI_MASK;
    } else {
        env->hflags2 &= ~HF2_NMI_MASK;
    }

    if (events.flags & KVM_VCPUEVENT_VALID_SMM) {
        if (events.smi.smm) {
            env->hflags |= HF_SMM_MASK;
        } else {
            env->hflags &= ~HF_SMM_MASK;
        }
        if (events.smi.pending) {
            cpu_interrupt(CPU(cpu), CPU_INTERRUPT_SMI);
        } else {
            cpu_reset_interrupt(CPU(cpu), CPU_INTERRUPT_SMI);
        }
        if (events.smi.smm_inside_nmi) {
            env->hflags2 |= HF2_SMM_INSIDE_NMI_MASK;
        } else {
            env->hflags2 &= ~HF2_SMM_INSIDE_NMI_MASK;
        }
        if (events.smi.latched_init) {
            cpu_interrupt(CPU(cpu), CPU_INTERRUPT_INIT);
        } else {
            cpu_reset_interrupt(CPU(cpu), CPU_INTERRUPT_INIT);
        }
    }

    env->sipi_vector = events.sipi_vector;

    return 0;
}

static int kvm_guest_debug_workarounds(X86CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    CPUX86State *env = &cpu->env;
    int ret = 0;
    unsigned long reinject_trap = 0;

    if (!kvm_has_vcpu_events()) {
        if (env->exception_injected == 1) {
            reinject_trap = KVM_GUESTDBG_INJECT_DB;
        } else if (env->exception_injected == 3) {
            reinject_trap = KVM_GUESTDBG_INJECT_BP;
        }
        env->exception_injected = -1;
    }

    /*
     * Kernels before KVM_CAP_X86_ROBUST_SINGLESTEP overwrote flags.TF
     * injected via SET_GUEST_DEBUG while updating GP regs. Work around this
     * by updating the debug state once again if single-stepping is on.
     * Another reason to call kvm_update_guest_debug here is a pending debug
     * trap raise by the guest. On kernels without SET_VCPU_EVENTS we have to
     * reinject them via SET_GUEST_DEBUG.
     */
    if (reinject_trap ||
        (!kvm_has_robust_singlestep() && cs->singlestep_enabled)) {
        ret = kvm_update_guest_debug(cs, reinject_trap);
    }
    return ret;
}

static int kvm_put_debugregs(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_debugregs dbgregs;
    int i;

    if (!kvm_has_debugregs()) {
        return 0;
    }

    for (i = 0; i < 4; i++) {
        dbgregs.db[i] = env->dr[i];
    }
    dbgregs.dr6 = env->dr[6];
    dbgregs.dr7 = env->dr[7];
    dbgregs.flags = 0;

    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_DEBUGREGS, &dbgregs);
}

static int kvm_get_debugregs(X86CPU *cpu)
{
    CPUX86State *env = &cpu->env;
    struct kvm_debugregs dbgregs;
    int i, ret;

    if (!kvm_has_debugregs()) {
        return 0;
    }

    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_DEBUGREGS, &dbgregs);
    if (ret < 0) {
        return ret;
    }
    for (i = 0; i < 4; i++) {
        env->dr[i] = dbgregs.db[i];
    }
    env->dr[4] = env->dr[6] = dbgregs.dr6;
    env->dr[5] = env->dr[7] = dbgregs.dr7;

    return 0;
}

int kvm_arch_put_registers(CPUState *cpu, int level)
{
    X86CPU *x86_cpu = X86_CPU(cpu);
    int ret;

    assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu));

    if (level >= KVM_PUT_RESET_STATE) {
        ret = kvm_put_msr_feature_control(x86_cpu);
        if (ret < 0) {
            return ret;
        }
    }

    if (level == KVM_PUT_FULL_STATE) {
        /* We don't check for kvm_arch_set_tsc_khz() errors here,
         * because TSC frequency mismatch shouldn't abort migration,
         * unless the user explicitly asked for a more strict TSC
         * setting (e.g. using an explicit "tsc-freq" option).
         */
        kvm_arch_set_tsc_khz(cpu);
    }

    ret = kvm_getput_regs(x86_cpu, 1);
    if (ret < 0) {
        return ret;
    }
    ret = kvm_put_xsave(x86_cpu);
    if (ret < 0) {
        return ret;
    }
    ret = kvm_put_xcrs(x86_cpu);
    if (ret < 0) {
        return ret;
    }
    ret = kvm_put_sregs(x86_cpu);
    if (ret < 0) {
        return ret;
    }
    /* must be before kvm_put_msrs */
    ret = kvm_inject_mce_oldstyle(x86_cpu);
    if (ret < 0) {
        return ret;
    }
    ret = kvm_put_msrs(x86_cpu, level);
    if (ret < 0) {
        return ret;
    }
    if (level >= KVM_PUT_RESET_STATE) {
        ret = kvm_put_mp_state(x86_cpu);
        if (ret < 0) {
            return ret;
        }
    }

    ret = kvm_put_tscdeadline_msr(x86_cpu);
    if (ret < 0) {
        return ret;
    }

    ret = kvm_put_vcpu_events(x86_cpu, level);
    if (ret < 0) {
        return ret;
    }
    ret = kvm_put_debugregs(x86_cpu);
    if (ret < 0) {
        return ret;
    }
    /* must be last */
    ret = kvm_guest_debug_workarounds(x86_cpu);
    if (ret < 0) {
        return ret;
    }
    return 0;
}

int kvm_arch_get_registers(CPUState *cs)
{
    X86CPU *cpu = X86_CPU(cs);
    int ret;

    assert(cpu_is_stopped(cs) || qemu_cpu_is_self(cs));

    ret = kvm_getput_regs(cpu, 0);
    if (ret < 0) {
        goto out;
    }
    ret = kvm_get_xsave(cpu);
    if (ret < 0) {
        goto out;
    }
    ret = kvm_get_xcrs(cpu);
    if (ret < 0) {
        goto out;
    }
    ret = kvm_get_sregs(cpu);
    if (ret < 0) {
        goto out;
    }
    ret = kvm_get_msrs(cpu);
    if (ret < 0) {
        goto out;
    }
    ret = kvm_get_mp_state(cpu);
    if (ret < 0) {
        goto out;
    }
    ret = kvm_get_apic(cpu);
    if (ret < 0) {
        goto out;
    }
    ret = kvm_get_vcpu_events(cpu);
    if (ret < 0) {
        goto out;
    }
    ret = kvm_get_debugregs(cpu);
    if (ret < 0) {
        goto out;
    }
    ret = 0;
 out:
    cpu_sync_bndcs_hflags(&cpu->env);
    return ret;
}

void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
{
    X86CPU *x86_cpu = X86_CPU(cpu);
    CPUX86State *env = &x86_cpu->env;
    int ret;

    /* Inject NMI */
    if (cpu->interrupt_request & (CPU_INTERRUPT_NMI | CPU_INTERRUPT_SMI)) {
        if (cpu->interrupt_request & CPU_INTERRUPT_NMI) {
            qemu_mutex_lock_iothread();
            cpu->interrupt_request &= ~CPU_INTERRUPT_NMI;
            qemu_mutex_unlock_iothread();
            DPRINTF("injected NMI\n");
            ret = kvm_vcpu_ioctl(cpu, KVM_NMI);
            if (ret < 0) {
                fprintf(stderr, "KVM: injection failed, NMI lost (%s)\n",
                        strerror(-ret));
            }
        }
        if (cpu->interrupt_request & CPU_INTERRUPT_SMI) {
            qemu_mutex_lock_iothread();
            cpu->interrupt_request &= ~CPU_INTERRUPT_SMI;
            qemu_mutex_unlock_iothread();
            DPRINTF("injected SMI\n");
            ret = kvm_vcpu_ioctl(cpu, KVM_SMI);
            if (ret < 0) {
                fprintf(stderr, "KVM: injection failed, SMI lost (%s)\n",
                        strerror(-ret));
            }
        }
    }

    if (!kvm_pic_in_kernel()) {
        qemu_mutex_lock_iothread();
    }

    /* Force the VCPU out of its inner loop to process any INIT requests
     * or (for userspace APIC, but it is cheap to combine the checks here)
     * pending TPR access reports.
     */
    if (cpu->interrupt_request & (CPU_INTERRUPT_INIT | CPU_INTERRUPT_TPR)) {
        if ((cpu->interrupt_request & CPU_INTERRUPT_INIT) &&
            !(env->hflags & HF_SMM_MASK)) {
            cpu->exit_request = 1;
        }
        if (cpu->interrupt_request & CPU_INTERRUPT_TPR) {
            cpu->exit_request = 1;
        }
    }

    if (!kvm_pic_in_kernel()) {
        /* Try to inject an interrupt if the guest can accept it */
        if (run->ready_for_interrupt_injection &&
            (cpu->interrupt_request & CPU_INTERRUPT_HARD) &&
            (env->eflags & IF_MASK)) {
            int irq;

            cpu->interrupt_request &= ~CPU_INTERRUPT_HARD;
            irq = cpu_get_pic_interrupt(env);
            if (irq >= 0) {
                struct kvm_interrupt intr;

                intr.irq = irq;
                DPRINTF("injected interrupt %d\n", irq);
                ret = kvm_vcpu_ioctl(cpu, KVM_INTERRUPT, &intr);
                if (ret < 0) {
                    fprintf(stderr,
                            "KVM: injection failed, interrupt lost (%s)\n",
                            strerror(-ret));
                }
            }
        }

        /* If we have an interrupt but the guest is not ready to receive an
         * interrupt, request an interrupt window exit.  This will
         * cause a return to userspace as soon as the guest is ready to
         * receive interrupts. */
        if ((cpu->interrupt_request & CPU_INTERRUPT_HARD)) {
            run->request_interrupt_window = 1;
        } else {
            run->request_interrupt_window = 0;
        }

        DPRINTF("setting tpr\n");
        run->cr8 = cpu_get_apic_tpr(x86_cpu->apic_state);

        qemu_mutex_unlock_iothread();
    }
}

MemTxAttrs kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
{
    X86CPU *x86_cpu = X86_CPU(cpu);
    CPUX86State *env = &x86_cpu->env;

    if (run->flags & KVM_RUN_X86_SMM) {
        env->hflags |= HF_SMM_MASK;
    } else {
        env->hflags &= ~HF_SMM_MASK;
    }
    if (run->if_flag) {
        env->eflags |= IF_MASK;
    } else {
        env->eflags &= ~IF_MASK;
    }

    /* We need to protect the apic state against concurrent accesses from
     * different threads in case the userspace irqchip is used. */
    if (!kvm_irqchip_in_kernel()) {
        qemu_mutex_lock_iothread();
    }
    cpu_set_apic_tpr(x86_cpu->apic_state, run->cr8);
    cpu_set_apic_base(x86_cpu->apic_state, run->apic_base);
    if (!kvm_irqchip_in_kernel()) {
        qemu_mutex_unlock_iothread();
    }
    return cpu_get_mem_attrs(env);
}

int kvm_arch_process_async_events(CPUState *cs)
{
    X86CPU *cpu = X86_CPU(cs);
    CPUX86State *env = &cpu->env;

    if (cs->interrupt_request & CPU_INTERRUPT_MCE) {
        /* We must not raise CPU_INTERRUPT_MCE if it's not supported. */
        assert(env->mcg_cap);

        cs->interrupt_request &= ~CPU_INTERRUPT_MCE;

        kvm_cpu_synchronize_state(cs);

        if (env->exception_injected == EXCP08_DBLE) {
            /* this means triple fault */
            qemu_system_reset_request();
            cs->exit_request = 1;
            return 0;
        }
        env->exception_injected = EXCP12_MCHK;
        env->has_error_code = 0;

        cs->halted = 0;
        if (kvm_irqchip_in_kernel() && env->mp_state == KVM_MP_STATE_HALTED) {
            env->mp_state = KVM_MP_STATE_RUNNABLE;
        }
    }

    if ((cs->interrupt_request & CPU_INTERRUPT_INIT) &&
        !(env->hflags & HF_SMM_MASK)) {
        kvm_cpu_synchronize_state(cs);
        do_cpu_init(cpu);
    }

    if (kvm_irqchip_in_kernel()) {
        return 0;
    }

    if (cs->interrupt_request & CPU_INTERRUPT_POLL) {
        cs->interrupt_request &= ~CPU_INTERRUPT_POLL;
        apic_poll_irq(cpu->apic_state);
    }
    if (((cs->interrupt_request & CPU_INTERRUPT_HARD) &&
         (env->eflags & IF_MASK)) ||
        (cs->interrupt_request & CPU_INTERRUPT_NMI)) {
        cs->halted = 0;
    }
    if (cs->interrupt_request & CPU_INTERRUPT_SIPI) {
        kvm_cpu_synchronize_state(cs);
        do_cpu_sipi(cpu);
    }
    if (cs->interrupt_request & CPU_INTERRUPT_TPR) {
        cs->interrupt_request &= ~CPU_INTERRUPT_TPR;
        kvm_cpu_synchronize_state(cs);
        apic_handle_tpr_access_report(cpu->apic_state, env->eip,
                                      env->tpr_access_type);
    }

    return cs->halted;
}

static int kvm_handle_halt(X86CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    CPUX86State *env = &cpu->env;

    if (!((cs->interrupt_request & CPU_INTERRUPT_HARD) &&
          (env->eflags & IF_MASK)) &&
        !(cs->interrupt_request & CPU_INTERRUPT_NMI)) {
        cs->halted = 1;
        return EXCP_HLT;
    }

    return 0;
}

static int kvm_handle_tpr_access(X86CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    struct kvm_run *run = cs->kvm_run;

    apic_handle_tpr_access_report(cpu->apic_state, run->tpr_access.rip,
                                  run->tpr_access.is_write ? TPR_ACCESS_WRITE
                                                           : TPR_ACCESS_READ);
    return 1;
}

int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
{
    static const uint8_t int3 = 0xcc;

    if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 0) ||
        cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&int3, 1, 1)) {
        return -EINVAL;
    }
    return 0;
}

int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
{
    uint8_t int3;

    if (cpu_memory_rw_debug(cs, bp->pc, &int3, 1, 0) || int3 != 0xcc ||
        cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
        return -EINVAL;
    }
    return 0;
}

static struct {
    target_ulong addr;
    int len;
    int type;
} hw_breakpoint[4];

static int nb_hw_breakpoint;

static int find_hw_breakpoint(target_ulong addr, int len, int type)
{
    int n;

    for (n = 0; n < nb_hw_breakpoint; n++) {
        if (hw_breakpoint[n].addr == addr && hw_breakpoint[n].type == type &&
            (hw_breakpoint[n].len == len || len == -1)) {
            return n;
        }
    }
    return -1;
}

int kvm_arch_insert_hw_breakpoint(target_ulong addr,
                                  target_ulong len, int type)
{
    switch (type) {
    case GDB_BREAKPOINT_HW:
        len = 1;
        break;
    case GDB_WATCHPOINT_WRITE:
    case GDB_WATCHPOINT_ACCESS:
        switch (len) {
        case 1:
            break;
        case 2:
        case 4:
        case 8:
            if (addr & (len - 1)) {
                return -EINVAL;
            }
            break;
        default:
            return -EINVAL;
        }
        break;
    default:
        return -ENOSYS;
    }

    if (nb_hw_breakpoint == 4) {
        return -ENOBUFS;
    }
    if (find_hw_breakpoint(addr, len, type) >= 0) {
        return -EEXIST;
    }
    hw_breakpoint[nb_hw_breakpoint].addr = addr;
    hw_breakpoint[nb_hw_breakpoint].len = len;
    hw_breakpoint[nb_hw_breakpoint].type = type;
    nb_hw_breakpoint++;

    return 0;
}

int kvm_arch_remove_hw_breakpoint(target_ulong addr,
                                  target_ulong len, int type)
{
    int n;

    n = find_hw_breakpoint(addr, (type == GDB_BREAKPOINT_HW) ? 1 : len, type);
    if (n < 0) {
        return -ENOENT;
    }
    nb_hw_breakpoint--;
    hw_breakpoint[n] = hw_breakpoint[nb_hw_breakpoint];

    return 0;
}

void kvm_arch_remove_all_hw_breakpoints(void)
{
    nb_hw_breakpoint = 0;
}

static CPUWatchpoint hw_watchpoint;

static int kvm_handle_debug(X86CPU *cpu,
                            struct kvm_debug_exit_arch *arch_info)
{
    CPUState *cs = CPU(cpu);
    CPUX86State *env = &cpu->env;
    int ret = 0;
    int n;

    if (arch_info->exception == 1) {
        if (arch_info->dr6 & (1 << 14)) {
            if (cs->singlestep_enabled) {
                ret = EXCP_DEBUG;
            }
        } else {
            for (n = 0; n < 4; n++) {
                if (arch_info->dr6 & (1 << n)) {
                    switch ((arch_info->dr7 >> (16 + n*4)) & 0x3) {
                    case 0x0:
                        ret = EXCP_DEBUG;
                        break;
                    case 0x1:
                        ret = EXCP_DEBUG;
                        cs->watchpoint_hit = &hw_watchpoint;
                        hw_watchpoint.vaddr = hw_breakpoint[n].addr;
                        hw_watchpoint.flags = BP_MEM_WRITE;
                        break;
                    case 0x3:
                        ret = EXCP_DEBUG;
                        cs->watchpoint_hit = &hw_watchpoint;
                        hw_watchpoint.vaddr = hw_breakpoint[n].addr;
                        hw_watchpoint.flags = BP_MEM_ACCESS;
                        break;
                    }
                }
            }
        }
    } else if (kvm_find_sw_breakpoint(cs, arch_info->pc)) {
        ret = EXCP_DEBUG;
    }
    if (ret == 0) {
        cpu_synchronize_state(cs);
        assert(env->exception_injected == -1);

        /* pass to guest */
        env->exception_injected = arch_info->exception;
        env->has_error_code = 0;
    }

    return ret;
}

void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg)
{
    const uint8_t type_code[] = {
        [GDB_BREAKPOINT_HW] = 0x0,
        [GDB_WATCHPOINT_WRITE] = 0x1,
        [GDB_WATCHPOINT_ACCESS] = 0x3
    };
    const uint8_t len_code[] = {
        [1] = 0x0, [2] = 0x1, [4] = 0x3, [8] = 0x2
    };
    int n;

    if (kvm_sw_breakpoints_active(cpu)) {
        dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
    }
    if (nb_hw_breakpoint > 0) {
        dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
        dbg->arch.debugreg[7] = 0x0600;
        for (n = 0; n < nb_hw_breakpoint; n++) {
            dbg->arch.debugreg[n] = hw_breakpoint[n].addr;
            dbg->arch.debugreg[7] |= (2 << (n * 2)) |
                (type_code[hw_breakpoint[n].type] << (16 + n*4)) |
                ((uint32_t)len_code[hw_breakpoint[n].len] << (18 + n*4));
        }
    }
}

static bool host_supports_vmx(void)
{
    uint32_t ecx, unused;

    host_cpuid(1, 0, &unused, &unused, &ecx, &unused);
    return ecx & CPUID_EXT_VMX;
}

#define VMX_INVALID_GUEST_STATE 0x80000021

int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
{
    X86CPU *cpu = X86_CPU(cs);
    uint64_t code;
    int ret;

    switch (run->exit_reason) {
    case KVM_EXIT_HLT:
        DPRINTF("handle_hlt\n");
        qemu_mutex_lock_iothread();
        ret = kvm_handle_halt(cpu);
        qemu_mutex_unlock_iothread();
        break;
    case KVM_EXIT_SET_TPR:
        ret = 0;
        break;
    case KVM_EXIT_TPR_ACCESS:
        qemu_mutex_lock_iothread();
        ret = kvm_handle_tpr_access(cpu);
        qemu_mutex_unlock_iothread();
        break;
    case KVM_EXIT_FAIL_ENTRY:
        code = run->fail_entry.hardware_entry_failure_reason;
        fprintf(stderr, "KVM: entry failed, hardware error 0x%" PRIx64 "\n",
                code);
        if (host_supports_vmx() && code == VMX_INVALID_GUEST_STATE) {
            fprintf(stderr,
                    "\nIf you're running a guest on an Intel machine without "
                        "unrestricted mode\n"
                    "support, the failure can be most likely due to the guest "
                        "entering an invalid\n"
                    "state for Intel VT. For example, the guest maybe running "
                        "in big real mode\n"
                    "which is not supported on less recent Intel processors."
                        "\n\n");
        }
        ret = -1;
        break;
    case KVM_EXIT_EXCEPTION:
        fprintf(stderr, "KVM: exception %d exit (error code 0x%x)\n",
                run->ex.exception, run->ex.error_code);
        ret = -1;
        break;
    case KVM_EXIT_DEBUG:
        DPRINTF("kvm_exit_debug\n");
        qemu_mutex_lock_iothread();
        ret = kvm_handle_debug(cpu, &run->debug.arch);
        qemu_mutex_unlock_iothread();
        break;
    case KVM_EXIT_HYPERV:
        ret = kvm_hv_handle_exit(cpu, &run->hyperv);
        break;
    case KVM_EXIT_IOAPIC_EOI:
        ioapic_eoi_broadcast(run->eoi.vector);
        ret = 0;
        break;
    default:
        fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
        ret = -1;
        break;
    }

    return ret;
}

bool kvm_arch_stop_on_emulation_error(CPUState *cs)
{
    X86CPU *cpu = X86_CPU(cs);
    CPUX86State *env = &cpu->env;

    kvm_cpu_synchronize_state(cs);
    return !(env->cr[0] & CR0_PE_MASK) ||
           ((env->segs[R_CS].selector  & 3) != 3);
}

void kvm_arch_init_irq_routing(KVMState *s)
{
    if (!kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
        /* If kernel can't do irq routing, interrupt source
         * override 0->2 cannot be set up as required by HPET.
         * So we have to disable it.
         */
        no_hpet = 1;
    }
    /* We know at this point that we're using the in-kernel
     * irqchip, so we can use irqfds, and on x86 we know
     * we can use msi via irqfd and GSI routing.
     */
    kvm_msi_via_irqfd_allowed = true;
    kvm_gsi_routing_allowed = true;

    if (kvm_irqchip_is_split()) {
        int i;

        /* If the ioapic is in QEMU and the lapics are in KVM, reserve
           MSI routes for signaling interrupts to the local apics. */
        for (i = 0; i < IOAPIC_NUM_PINS; i++) {
            if (kvm_irqchip_add_msi_route(s, 0, NULL) < 0) {
                error_report("Could not enable split IRQ mode.");
                exit(1);
            }
        }
    }
}

int kvm_arch_irqchip_create(MachineState *ms, KVMState *s)
{
    int ret;
    if (machine_kernel_irqchip_split(ms)) {
        ret = kvm_vm_enable_cap(s, KVM_CAP_SPLIT_IRQCHIP, 0, 24);
        if (ret) {
            error_report("Could not enable split irqchip mode: %s",
                         strerror(-ret));
            exit(1);
        } else {
            DPRINTF("Enabled KVM_CAP_SPLIT_IRQCHIP\n");
            kvm_split_irqchip = true;
            return 1;
        }
    } else {
        return 0;
    }
}

/* Classic KVM device assignment interface. Will remain x86 only. */
int kvm_device_pci_assign(KVMState *s, PCIHostDeviceAddress *dev_addr,
                          uint32_t flags, uint32_t *dev_id)
{
    struct kvm_assigned_pci_dev dev_data = {
        .segnr = dev_addr->domain,
        .busnr = dev_addr->bus,
        .devfn = PCI_DEVFN(dev_addr->slot, dev_addr->function),
        .flags = flags,
    };
    int ret;

    dev_data.assigned_dev_id =
        (dev_addr->domain << 16) | (dev_addr->bus << 8) | dev_data.devfn;

    ret = kvm_vm_ioctl(s, KVM_ASSIGN_PCI_DEVICE, &dev_data);
    if (ret < 0) {
        return ret;
    }

    *dev_id = dev_data.assigned_dev_id;

    return 0;
}

int kvm_device_pci_deassign(KVMState *s, uint32_t dev_id)
{
    struct kvm_assigned_pci_dev dev_data = {
        .assigned_dev_id = dev_id,
    };

    return kvm_vm_ioctl(s, KVM_DEASSIGN_PCI_DEVICE, &dev_data);
}

static int kvm_assign_irq_internal(KVMState *s, uint32_t dev_id,
                                   uint32_t irq_type, uint32_t guest_irq)
{
    struct kvm_assigned_irq assigned_irq = {
        .assigned_dev_id = dev_id,
        .guest_irq = guest_irq,
        .flags = irq_type,
    };

    if (kvm_check_extension(s, KVM_CAP_ASSIGN_DEV_IRQ)) {
        return kvm_vm_ioctl(s, KVM_ASSIGN_DEV_IRQ, &assigned_irq);
    } else {
        return kvm_vm_ioctl(s, KVM_ASSIGN_IRQ, &assigned_irq);
    }
}

int kvm_device_intx_assign(KVMState *s, uint32_t dev_id, bool use_host_msi,
                           uint32_t guest_irq)
{
    uint32_t irq_type = KVM_DEV_IRQ_GUEST_INTX |
        (use_host_msi ? KVM_DEV_IRQ_HOST_MSI : KVM_DEV_IRQ_HOST_INTX);

    return kvm_assign_irq_internal(s, dev_id, irq_type, guest_irq);
}

int kvm_device_intx_set_mask(KVMState *s, uint32_t dev_id, bool masked)
{
    struct kvm_assigned_pci_dev dev_data = {
        .assigned_dev_id = dev_id,
        .flags = masked ? KVM_DEV_ASSIGN_MASK_INTX : 0,
    };

    return kvm_vm_ioctl(s, KVM_ASSIGN_SET_INTX_MASK, &dev_data);
}

static int kvm_deassign_irq_internal(KVMState *s, uint32_t dev_id,
                                     uint32_t type)
{
    struct kvm_assigned_irq assigned_irq = {
        .assigned_dev_id = dev_id,
        .flags = type,
    };

    return kvm_vm_ioctl(s, KVM_DEASSIGN_DEV_IRQ, &assigned_irq);
}

int kvm_device_intx_deassign(KVMState *s, uint32_t dev_id, bool use_host_msi)
{
    return kvm_deassign_irq_internal(s, dev_id, KVM_DEV_IRQ_GUEST_INTX |
        (use_host_msi ? KVM_DEV_IRQ_HOST_MSI : KVM_DEV_IRQ_HOST_INTX));
}

int kvm_device_msi_assign(KVMState *s, uint32_t dev_id, int virq)
{
    return kvm_assign_irq_internal(s, dev_id, KVM_DEV_IRQ_HOST_MSI |
                                              KVM_DEV_IRQ_GUEST_MSI, virq);
}

int kvm_device_msi_deassign(KVMState *s, uint32_t dev_id)
{
    return kvm_deassign_irq_internal(s, dev_id, KVM_DEV_IRQ_GUEST_MSI |
                                                KVM_DEV_IRQ_HOST_MSI);
}

bool kvm_device_msix_supported(KVMState *s)
{
    /* The kernel lacks a corresponding KVM_CAP, so we probe by calling
     * KVM_ASSIGN_SET_MSIX_NR with an invalid parameter. */
    return kvm_vm_ioctl(s, KVM_ASSIGN_SET_MSIX_NR, NULL) == -EFAULT;
}

int kvm_device_msix_init_vectors(KVMState *s, uint32_t dev_id,
                                 uint32_t nr_vectors)
{
    struct kvm_assigned_msix_nr msix_nr = {
        .assigned_dev_id = dev_id,
        .entry_nr = nr_vectors,
    };

    return kvm_vm_ioctl(s, KVM_ASSIGN_SET_MSIX_NR, &msix_nr);
}

int kvm_device_msix_set_vector(KVMState *s, uint32_t dev_id, uint32_t vector,
                               int virq)
{
    struct kvm_assigned_msix_entry msix_entry = {
        .assigned_dev_id = dev_id,
        .gsi = virq,
        .entry = vector,
    };

    return kvm_vm_ioctl(s, KVM_ASSIGN_SET_MSIX_ENTRY, &msix_entry);
}

int kvm_device_msix_assign(KVMState *s, uint32_t dev_id)
{
    return kvm_assign_irq_internal(s, dev_id, KVM_DEV_IRQ_HOST_MSIX |
                                              KVM_DEV_IRQ_GUEST_MSIX, 0);
}

int kvm_device_msix_deassign(KVMState *s, uint32_t dev_id)
{
    return kvm_deassign_irq_internal(s, dev_id, KVM_DEV_IRQ_GUEST_MSIX |
                                                KVM_DEV_IRQ_HOST_MSIX);
}

int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
                             uint64_t address, uint32_t data, PCIDevice *dev)
{
    X86IOMMUState *iommu = x86_iommu_get_default();

    if (iommu) {
        int ret;
        MSIMessage src, dst;
        X86IOMMUClass *class = X86_IOMMU_GET_CLASS(iommu);

        src.address = route->u.msi.address_hi;
        src.address <<= VTD_MSI_ADDR_HI_SHIFT;
        src.address |= route->u.msi.address_lo;
        src.data = route->u.msi.data;

        ret = class->int_remap(iommu, &src, &dst, dev ? \
                               pci_requester_id(dev) : \
                               X86_IOMMU_SID_INVALID);
        if (ret) {
            trace_kvm_x86_fixup_msi_error(route->gsi);
            return 1;
        }

        route->u.msi.address_hi = dst.address >> VTD_MSI_ADDR_HI_SHIFT;
        route->u.msi.address_lo = dst.address & VTD_MSI_ADDR_LO_MASK;
        route->u.msi.data = dst.data;
    }

    return 0;
}

typedef struct MSIRouteEntry MSIRouteEntry;

struct MSIRouteEntry {
    PCIDevice *dev;             /* Device pointer */
    int vector;                 /* MSI/MSIX vector index */
    int virq;                   /* Virtual IRQ index */
    QLIST_ENTRY(MSIRouteEntry) list;
};

/* List of used GSI routes */
static QLIST_HEAD(, MSIRouteEntry) msi_route_list = \
    QLIST_HEAD_INITIALIZER(msi_route_list);

static void kvm_update_msi_routes_all(void *private, bool global,
                                      uint32_t index, uint32_t mask)
{
    int cnt = 0;
    MSIRouteEntry *entry;
    MSIMessage msg;
    /* TODO: explicit route update */
    QLIST_FOREACH(entry, &msi_route_list, list) {
        cnt++;
        msg = pci_get_msi_message(entry->dev, entry->vector);
        kvm_irqchip_update_msi_route(kvm_state, entry->virq,
                                     msg, entry->dev);
    }
    kvm_irqchip_commit_routes(kvm_state);
    trace_kvm_x86_update_msi_routes(cnt);
}

int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
                                int vector, PCIDevice *dev)
{
    static bool notify_list_inited = false;
    MSIRouteEntry *entry;

    if (!dev) {
        /* These are (possibly) IOAPIC routes only used for split
         * kernel irqchip mode, while what we are housekeeping are
         * PCI devices only. */
        return 0;
    }

    entry = g_new0(MSIRouteEntry, 1);
    entry->dev = dev;
    entry->vector = vector;
    entry->virq = route->gsi;
    QLIST_INSERT_HEAD(&msi_route_list, entry, list);

    trace_kvm_x86_add_msi_route(route->gsi);

    if (!notify_list_inited) {
        /* For the first time we do add route, add ourselves into
         * IOMMU's IEC notify list if needed. */
        X86IOMMUState *iommu = x86_iommu_get_default();
        if (iommu) {
            x86_iommu_iec_register_notifier(iommu,
                                            kvm_update_msi_routes_all,
                                            NULL);
        }
        notify_list_inited = true;
    }
    return 0;
}

int kvm_arch_release_virq_post(int virq)
{
    MSIRouteEntry *entry, *next;
    QLIST_FOREACH_SAFE(entry, &msi_route_list, list, next) {
        if (entry->virq == virq) {
            trace_kvm_x86_remove_msi_route(virq);
            QLIST_REMOVE(entry, list);
            break;
        }
    }
    return 0;
}

int kvm_arch_msi_data_to_gsi(uint32_t data)
{
    abort();
}