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-rw-r--r--target/i386/cpu.c234
-rw-r--r--target/i386/cpu.h14
-rw-r--r--target/i386/kvm.c29
3 files changed, 210 insertions, 67 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 94260412e2..1e69e68f25 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -335,6 +335,99 @@ static void encode_cache_cpuid80000006(CPUCacheInfo *l2,
}
/*
+ * Definitions used for building CPUID Leaf 0x8000001D and 0x8000001E
+ * Please refer to the AMD64 Architecture Programmer’s Manual Volume 3.
+ * Define the constants to build the cpu topology. Right now, TOPOEXT
+ * feature is enabled only on EPYC. So, these constants are based on
+ * EPYC supported configurations. We may need to handle the cases if
+ * these values change in future.
+ */
+/* Maximum core complexes in a node */
+#define MAX_CCX 2
+/* Maximum cores in a core complex */
+#define MAX_CORES_IN_CCX 4
+/* Maximum cores in a node */
+#define MAX_CORES_IN_NODE 8
+/* Maximum nodes in a socket */
+#define MAX_NODES_PER_SOCKET 4
+
+/*
+ * Figure out the number of nodes required to build this config.
+ * Max cores in a node is 8
+ */
+static int nodes_in_socket(int nr_cores)
+{
+ int nodes;
+
+ nodes = DIV_ROUND_UP(nr_cores, MAX_CORES_IN_NODE);
+
+ /* Hardware does not support config with 3 nodes, return 4 in that case */
+ return (nodes == 3) ? 4 : nodes;
+}
+
+/*
+ * Decide the number of cores in a core complex with the given nr_cores using
+ * following set constants MAX_CCX, MAX_CORES_IN_CCX, MAX_CORES_IN_NODE and
+ * MAX_NODES_PER_SOCKET. Maintain symmetry as much as possible
+ * L3 cache is shared across all cores in a core complex. So, this will also
+ * tell us how many cores are sharing the L3 cache.
+ */
+static int cores_in_core_complex(int nr_cores)
+{
+ int nodes;
+
+ /* Check if we can fit all the cores in one core complex */
+ if (nr_cores <= MAX_CORES_IN_CCX) {
+ return nr_cores;
+ }
+ /* Get the number of nodes required to build this config */
+ nodes = nodes_in_socket(nr_cores);
+
+ /*
+ * Divide the cores accros all the core complexes
+ * Return rounded up value
+ */
+ return DIV_ROUND_UP(nr_cores, nodes * MAX_CCX);
+}
+
+/* Encode cache info for CPUID[8000001D] */
+static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, CPUState *cs,
+ uint32_t *eax, uint32_t *ebx,
+ uint32_t *ecx, uint32_t *edx)
+{
+ uint32_t l3_cores;
+ assert(cache->size == cache->line_size * cache->associativity *
+ cache->partitions * cache->sets);
+
+ *eax = CACHE_TYPE(cache->type) | CACHE_LEVEL(cache->level) |
+ (cache->self_init ? CACHE_SELF_INIT_LEVEL : 0);
+
+ /* L3 is shared among multiple cores */
+ if (cache->level == 3) {
+ l3_cores = cores_in_core_complex(cs->nr_cores);
+ *eax |= ((l3_cores * cs->nr_threads) - 1) << 14;
+ } else {
+ *eax |= ((cs->nr_threads - 1) << 14);
+ }
+
+ assert(cache->line_size > 0);
+ assert(cache->partitions > 0);
+ assert(cache->associativity > 0);
+ /* We don't implement fully-associative caches */
+ assert(cache->associativity < cache->sets);
+ *ebx = (cache->line_size - 1) |
+ ((cache->partitions - 1) << 12) |
+ ((cache->associativity - 1) << 22);
+
+ assert(cache->sets > 0);
+ *ecx = cache->sets - 1;
+
+ *edx = (cache->no_invd_sharing ? CACHE_NO_INVD_SHARING : 0) |
+ (cache->inclusive ? CACHE_INCLUSIVE : 0) |
+ (cache->complex_indexing ? CACHE_COMPLEX_IDX : 0);
+}
+
+/*
* Definitions of the hardcoded cache entries we expose:
* These are legacy cache values. If there is a need to change any
* of these values please use builtin_x86_defs
@@ -1112,7 +1205,7 @@ struct X86CPUDefinition {
};
static CPUCaches epyc_cache_info = {
- .l1d_cache = {
+ .l1d_cache = &(CPUCacheInfo) {
.type = DCACHE,
.level = 1,
.size = 32 * KiB,
@@ -1124,7 +1217,7 @@ static CPUCaches epyc_cache_info = {
.self_init = 1,
.no_invd_sharing = true,
},
- .l1i_cache = {
+ .l1i_cache = &(CPUCacheInfo) {
.type = ICACHE,
.level = 1,
.size = 64 * KiB,
@@ -1136,7 +1229,7 @@ static CPUCaches epyc_cache_info = {
.self_init = 1,
.no_invd_sharing = true,
},
- .l2_cache = {
+ .l2_cache = &(CPUCacheInfo) {
.type = UNIFIED_CACHE,
.level = 2,
.size = 512 * KiB,
@@ -1146,7 +1239,7 @@ static CPUCaches epyc_cache_info = {
.sets = 1024,
.lines_per_tag = 1,
},
- .l3_cache = {
+ .l3_cache = &(CPUCacheInfo) {
.type = UNIFIED_CACHE,
.level = 3,
.size = 8 * MiB,
@@ -3340,9 +3433,8 @@ static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
env->features[w] = def->features[w];
}
- /* Store Cache information from the X86CPUDefinition if available */
- env->cache_info = def->cache_info;
- cpu->legacy_cache = def->cache_info ? 0 : 1;
+ /* legacy-cache defaults to 'off' if CPU model provides cache info */
+ cpu->legacy_cache = !def->cache_info;
/* Special cases not set in the X86CPUDefinition structs: */
/* TODO: in-kernel irqchip for hvf */
@@ -3693,21 +3785,11 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
if (!cpu->enable_l3_cache) {
*ecx = 0;
} else {
- if (env->cache_info && !cpu->legacy_cache) {
- *ecx = cpuid2_cache_descriptor(&env->cache_info->l3_cache);
- } else {
- *ecx = cpuid2_cache_descriptor(&legacy_l3_cache);
- }
- }
- if (env->cache_info && !cpu->legacy_cache) {
- *edx = (cpuid2_cache_descriptor(&env->cache_info->l1d_cache) << 16) |
- (cpuid2_cache_descriptor(&env->cache_info->l1i_cache) << 8) |
- (cpuid2_cache_descriptor(&env->cache_info->l2_cache));
- } else {
- *edx = (cpuid2_cache_descriptor(&legacy_l1d_cache) << 16) |
- (cpuid2_cache_descriptor(&legacy_l1i_cache) << 8) |
- (cpuid2_cache_descriptor(&legacy_l2_cache_cpuid2));
+ *ecx = cpuid2_cache_descriptor(env->cache_info_cpuid2.l3_cache);
}
+ *edx = (cpuid2_cache_descriptor(env->cache_info_cpuid2.l1d_cache) << 16) |
+ (cpuid2_cache_descriptor(env->cache_info_cpuid2.l1i_cache) << 8) |
+ (cpuid2_cache_descriptor(env->cache_info_cpuid2.l2_cache));
break;
case 4:
/* cache info: needed for Core compatibility */
@@ -3720,35 +3802,27 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
}
} else {
*eax = 0;
- CPUCacheInfo *l1d, *l1i, *l2, *l3;
- if (env->cache_info && !cpu->legacy_cache) {
- l1d = &env->cache_info->l1d_cache;
- l1i = &env->cache_info->l1i_cache;
- l2 = &env->cache_info->l2_cache;
- l3 = &env->cache_info->l3_cache;
- } else {
- l1d = &legacy_l1d_cache;
- l1i = &legacy_l1i_cache;
- l2 = &legacy_l2_cache;
- l3 = &legacy_l3_cache;
- }
switch (count) {
case 0: /* L1 dcache info */
- encode_cache_cpuid4(l1d, 1, cs->nr_cores,
+ encode_cache_cpuid4(env->cache_info_cpuid4.l1d_cache,
+ 1, cs->nr_cores,
eax, ebx, ecx, edx);
break;
case 1: /* L1 icache info */
- encode_cache_cpuid4(l1i, 1, cs->nr_cores,
+ encode_cache_cpuid4(env->cache_info_cpuid4.l1i_cache,
+ 1, cs->nr_cores,
eax, ebx, ecx, edx);
break;
case 2: /* L2 cache info */
- encode_cache_cpuid4(l2, cs->nr_threads, cs->nr_cores,
+ encode_cache_cpuid4(env->cache_info_cpuid4.l2_cache,
+ cs->nr_threads, cs->nr_cores,
eax, ebx, ecx, edx);
break;
case 3: /* L3 cache info */
pkg_offset = apicid_pkg_offset(cs->nr_cores, cs->nr_threads);
if (cpu->enable_l3_cache) {
- encode_cache_cpuid4(l3, (1 << pkg_offset), cs->nr_cores,
+ encode_cache_cpuid4(env->cache_info_cpuid4.l3_cache,
+ (1 << pkg_offset), cs->nr_cores,
eax, ebx, ecx, edx);
break;
}
@@ -3961,13 +4035,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
(L1_ITLB_2M_ASSOC << 8) | (L1_ITLB_2M_ENTRIES);
*ebx = (L1_DTLB_4K_ASSOC << 24) | (L1_DTLB_4K_ENTRIES << 16) | \
(L1_ITLB_4K_ASSOC << 8) | (L1_ITLB_4K_ENTRIES);
- if (env->cache_info && !cpu->legacy_cache) {
- *ecx = encode_cache_cpuid80000005(&env->cache_info->l1d_cache);
- *edx = encode_cache_cpuid80000005(&env->cache_info->l1i_cache);
- } else {
- *ecx = encode_cache_cpuid80000005(&legacy_l1d_cache_amd);
- *edx = encode_cache_cpuid80000005(&legacy_l1i_cache_amd);
- }
+ *ecx = encode_cache_cpuid80000005(env->cache_info_amd.l1d_cache);
+ *edx = encode_cache_cpuid80000005(env->cache_info_amd.l1i_cache);
break;
case 0x80000006:
/* cache info (L2 cache) */
@@ -3983,17 +4052,10 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
(L2_DTLB_4K_ENTRIES << 16) | \
(AMD_ENC_ASSOC(L2_ITLB_4K_ASSOC) << 12) | \
(L2_ITLB_4K_ENTRIES);
- if (env->cache_info && !cpu->legacy_cache) {
- encode_cache_cpuid80000006(&env->cache_info->l2_cache,
- cpu->enable_l3_cache ?
- &env->cache_info->l3_cache : NULL,
- ecx, edx);
- } else {
- encode_cache_cpuid80000006(&legacy_l2_cache_amd,
- cpu->enable_l3_cache ?
- &legacy_l3_cache : NULL,
- ecx, edx);
- }
+ encode_cache_cpuid80000006(env->cache_info_amd.l2_cache,
+ cpu->enable_l3_cache ?
+ env->cache_info_amd.l3_cache : NULL,
+ ecx, edx);
break;
case 0x80000007:
*eax = 0;
@@ -4034,6 +4096,30 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*edx = 0;
}
break;
+ case 0x8000001D:
+ *eax = 0;
+ switch (count) {
+ case 0: /* L1 dcache info */
+ encode_cache_cpuid8000001d(env->cache_info_amd.l1d_cache, cs,
+ eax, ebx, ecx, edx);
+ break;
+ case 1: /* L1 icache info */
+ encode_cache_cpuid8000001d(env->cache_info_amd.l1i_cache, cs,
+ eax, ebx, ecx, edx);
+ break;
+ case 2: /* L2 cache info */
+ encode_cache_cpuid8000001d(env->cache_info_amd.l2_cache, cs,
+ eax, ebx, ecx, edx);
+ break;
+ case 3: /* L3 cache info */
+ encode_cache_cpuid8000001d(env->cache_info_amd.l3_cache, cs,
+ eax, ebx, ecx, edx);
+ break;
+ default: /* end of info */
+ *eax = *ebx = *ecx = *edx = 0;
+ break;
+ }
+ break;
case 0xC0000000:
*eax = env->cpuid_xlevel2;
*ebx = 0;
@@ -4690,6 +4776,37 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
cpu->phys_bits = 32;
}
}
+
+ /* Cache information initialization */
+ if (!cpu->legacy_cache) {
+ if (!xcc->cpu_def || !xcc->cpu_def->cache_info) {
+ char *name = x86_cpu_class_get_model_name(xcc);
+ error_setg(errp,
+ "CPU model '%s' doesn't support legacy-cache=off", name);
+ g_free(name);
+ return;
+ }
+ env->cache_info_cpuid2 = env->cache_info_cpuid4 = env->cache_info_amd =
+ *xcc->cpu_def->cache_info;
+ } else {
+ /* Build legacy cache information */
+ env->cache_info_cpuid2.l1d_cache = &legacy_l1d_cache;
+ env->cache_info_cpuid2.l1i_cache = &legacy_l1i_cache;
+ env->cache_info_cpuid2.l2_cache = &legacy_l2_cache_cpuid2;
+ env->cache_info_cpuid2.l3_cache = &legacy_l3_cache;
+
+ env->cache_info_cpuid4.l1d_cache = &legacy_l1d_cache;
+ env->cache_info_cpuid4.l1i_cache = &legacy_l1i_cache;
+ env->cache_info_cpuid4.l2_cache = &legacy_l2_cache;
+ env->cache_info_cpuid4.l3_cache = &legacy_l3_cache;
+
+ env->cache_info_amd.l1d_cache = &legacy_l1d_cache_amd;
+ env->cache_info_amd.l1i_cache = &legacy_l1i_cache_amd;
+ env->cache_info_amd.l2_cache = &legacy_l2_cache_amd;
+ env->cache_info_amd.l3_cache = &legacy_l3_cache;
+ }
+
+
cpu_exec_realizefn(cs, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
@@ -5173,11 +5290,10 @@ static Property x86_cpu_properties[] = {
DEFINE_PROP_BOOL("vmware-cpuid-freq", X86CPU, vmware_cpuid_freq, true),
DEFINE_PROP_BOOL("tcg-cpuid", X86CPU, expose_tcg, true),
/*
- * lecacy_cache defaults to CPU model being chosen. This is set in
- * x86_cpu_load_def based on cache_info which is initialized in
- * builtin_x86_defs
+ * lecacy_cache defaults to true unless the CPU model provides its
+ * own cache information (see x86_cpu_load_def()).
*/
- DEFINE_PROP_BOOL("legacy-cache", X86CPU, legacy_cache, false),
+ DEFINE_PROP_BOOL("legacy-cache", X86CPU, legacy_cache, true),
/*
* From "Requirements for Implementing the Microsoft
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 664504610e..89c82be8d2 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1098,10 +1098,10 @@ typedef struct CPUCacheInfo {
typedef struct CPUCaches {
- CPUCacheInfo l1d_cache;
- CPUCacheInfo l1i_cache;
- CPUCacheInfo l2_cache;
- CPUCacheInfo l3_cache;
+ CPUCacheInfo *l1d_cache;
+ CPUCacheInfo *l1i_cache;
+ CPUCacheInfo *l2_cache;
+ CPUCacheInfo *l3_cache;
} CPUCaches;
typedef struct CPUX86State {
@@ -1293,7 +1293,11 @@ typedef struct CPUX86State {
/* Features that were explicitly enabled/disabled */
FeatureWordArray user_features;
uint32_t cpuid_model[12];
- CPUCaches *cache_info;
+ /* Cache information for CPUID. When legacy-cache=on, the cache data
+ * on each CPUID leaf will be different, because we keep compatibility
+ * with old QEMU versions.
+ */
+ CPUCaches cache_info_cpuid2, cache_info_cpuid4, cache_info_amd;
/* MTRRs */
uint64_t mtrr_fixed[11];
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 44f70733e7..445e0e0b11 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -979,9 +979,32 @@ int kvm_arch_init_vcpu(CPUState *cs)
}
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);
+ switch (i) {
+ case 0x8000001d:
+ /* Query for all AMD cache information leaves */
+ for (j = 0; ; j++) {
+ 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 (c->eax == 0) {
+ break;
+ }
+ 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;
+ }
}
/* Call Centaur's CPUID instructions they are supported. */
generated by cgit v1.2.3 (git 2.26.2) at 2025-01-26 04:10:11 +0000