From c74f41bbcc83d12787ac42f2c74fc2be54e9f222 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 13 Sep 2013 15:55:57 +0200 Subject: [PATCH] x86: fix migration from pre-version 12 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 Signed-off-by: Gleb Natapov --- target-i386/cpu.c | 1 + target-i386/cpu.h | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/target-i386/cpu.c b/target-i386/cpu.c index b682802..ea99b26 100644 --- a/target-i386/cpu.c +++ b/target-i386/cpu.c @@ -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; diff --git a/target-i386/cpu.h b/target-i386/cpu.h index 5723eff..ea373e8 100644 --- a/target-i386/cpu.h +++ b/target-i386/cpu.h @@ -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 */ -- 2.7.4