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From 8328cafa2406bcfed728c236fce8e5121f6c0b6d Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Tue, 5 Nov 2013 15:10:43 +0100
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Subject: [PATCH 52/81] x86: fix migration from pre-version 12
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1383664244-14818-2-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 55408
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 1/2] x86: fix migration from pre-version 12
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Bugzilla: 1005695
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RH-Acked-by: Alex Williamson <alex.williamson@redhat.com>
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RH-Acked-by: Orit Wasserman <owasserm@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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On KVM, the KVM_SET_XSAVE would be executed with a 0 xstate_bv,
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and not restore anything.
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Since FP and SSE data are always valid, set them in xstate_bv at reset
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time. In fact, that value is the same that KVM_GET_XSAVE returns on
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pre-XSAVE hosts.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Gleb Natapov <gleb@redhat.com>
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(cherry picked from commit c74f41bbcc83d12787ac42f2c74fc2be54e9f222)
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---
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target-i386/cpu.c | 1 +
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target-i386/cpu.h | 4 ++++
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2 files changed, 5 insertions(+)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target-i386/cpu.c | 1 +
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target-i386/cpu.h | 4 ++++
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2 files changed, 5 insertions(+), 0 deletions(-)
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diff --git a/target-i386/cpu.c b/target-i386/cpu.c
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index 170a46c..bc077ca 100644
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--- a/target-i386/cpu.c
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+++ b/target-i386/cpu.c
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@@ -2269,6 +2269,7 @@ static void x86_cpu_reset(CPUState *s)
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env->fpuc = 0x37f;
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env->mxcsr = 0x1f80;
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+ env->xstate_bv = XSTATE_FP | XSTATE_SSE;
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env->pat = 0x0007040600070406ULL;
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env->msr_ia32_misc_enable = MSR_IA32_MISC_ENABLE_DEFAULT;
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diff --git a/target-i386/cpu.h b/target-i386/cpu.h
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index 6aebc80..9c55953 100644
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--- a/target-i386/cpu.h
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+++ b/target-i386/cpu.h
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@@ -379,6 +379,10 @@
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#define MSR_VM_HSAVE_PA 0xc0010117
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+#define XSTATE_FP 1
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+#define XSTATE_SSE 2
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+#define XSTATE_YMM 4
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+
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/* CPUID feature words */
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typedef enum FeatureWord {
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FEAT_1_EDX, /* CPUID[1].EDX */
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--
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1.7.1
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