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x86: fix migration from pre-version 12

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On KVM, the KVM_SET_XSAVE would be executed with a 0 xstate_bv,
and not restore anything.

Since FP and SSE data are always valid, set them in xstate_bv at reset
time.  In fact, that value is the same that KVM_GET_XSAVE returns on
pre-XSAVE hosts.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-09-13 15:55:57 +02:00 committed by Gleb Natapov
parent a684f3cf9b
commit c74f41bbcc
2 changed files with 5 additions and 0 deletions
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1
target-i386/cpu.c
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@ -2405,6 +2405,7 @@ static void x86_cpu_reset(CPUState *s)
env->fpuc = 0x37f;
env->mxcsr = 0x1f80;
env->xstate_bv = XSTATE_FP | XSTATE_SSE;
env->pat = 0x0007040600070406ULL;
env->msr_ia32_misc_enable = MSR_IA32_MISC_ENABLE_DEFAULT;

4
target-i386/cpu.h
View File

@ -380,6 +380,10 @@
#define MSR_VM_HSAVE_PA 0xc0010117
#define XSTATE_FP 1
#define XSTATE_SSE 2
#define XSTATE_YMM 4
/* CPUID feature words */
typedef enum FeatureWord {
FEAT_1_EDX, /* CPUID[1].EDX */