diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-05-16 11:11:29 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-05-23 16:53:43 +0200 |
| commit | 14cb949a3e2efd64ea3271b919b33b452ce7b180 (patch) | |
| tree | b26418271f60efab486679c13a3d03ad577375ea | |
| parent | 5919e0328b7d6a08a661c3c747bae3e841d4e6f4 (diff) | |
target-i386: key sfence availability on CPUID_SSE, not CPUID_SSE2
sfence was introduced before lfence and mfence. This fixes Linux
2.4's measurement of checksumming speeds for the pIII_sse
algorithm:
md: linear personality registered as nr 1
md: raid0 personality registered as nr 2
md: raid1 personality registered as nr 3
md: raid5 personality registered as nr 4
raid5: measuring checksumming speed
8regs : 384.400 MB/sec
32regs : 259.200 MB/sec
invalid operand: 0000
CPU: 0
EIP: 0010:[<c0240b2a>] Not tainted
EFLAGS: 00000246
eax: c15d8000 ebx: 00000000 ecx: 00000000 edx: c15d5000
esi: 8005003b edi: 00000004 ebp: 00000000 esp: c15bdf50
ds: 0018 es: 0018 ss: 0018
Process swapper (pid: 1, stackpage=c15bd000)
Stack: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000
00000000 00000206 c0241c6c 00001000 c15d4000 c15d7000 c15d4000
c15d4000
Call Trace: [<c0241c6c>] [<c0105000>] [<c0241db4>] [<c010503b>]
[<c0105000>]
[<c0107416>] [<c0105030>]
Code: 0f ae f8 0f 10 04 24 0f 10 4c 24 10 0f 10 54 24 20 0f 10 5c
<0>Kernel panic: Attempted to kill init!
Reported-by: Stefan Weil <sw@weilnetz.de>
Fixes: 121f3157887f92268a3d6169e2d4601f9292020b
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | target-i386/translate.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index 8085467945..731b10de06 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -8008,6 +8008,11 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, } /* fallthru */ case 0xf9 ... 0xff: /* sfence */ + if (!(s->cpuid_features & CPUID_SSE) + || (prefixes & PREFIX_LOCK)) { + goto illegal_op; + } + break; case 0xe8 ... 0xef: /* lfence */ case 0xf0 ... 0xf7: /* mfence */ if (!(s->cpuid_features & CPUID_SSE2) |