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target-i386: key sfence availability on CPUID_SSE, not CPUID_SSE2

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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!

Backports commit bd5d278668f33aa08755a982986cd1159746c037 from qemu
This commit is contained in:
Paolo Bonzini 2018-02-23 14:03:06 -05:00 committed by Lioncash
parent 0c4bebb9bc
commit 44c4dd02c9
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 5 additions and 0 deletions
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5
qemu/target-i386/translate.c
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@ -8714,6 +8714,11 @@ case 0x101:
case 0xfd:
case 0xfe:
case 0xff: /* sfence */
if (!(s->cpuid_features & CPUID_SSE)
|| (prefixes & PREFIX_LOCK)) {
goto illegal_op;
}
break;
case 0xe8:
case 0xe9:
case 0xea: