linux-kernel - [PATCH] KVM: x86: fix eflags state following processor init/reset

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Date:	Wed, 21 Oct 2015 14:28:25 +0800
From:	Wanpeng Li <wanpeng.li@...mail.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Wanpeng Li <wanpeng.li@...mail.com>
Subject: [PATCH] KVM: x86: fix eflags state following processor init/reset

Reference SDM 3.4.3:

Following initialization of the processor (either by asserting the 
RESET pin or the INIT pin), the state of the EFLAGS register is 
00000002H.

However, the eflags fixed bit is not set and other bits are also not 
cleared during the init/reset in kvm.

This patch fix it by set eflags register to 00000002H following 
initialization of the processor.

Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
---
 arch/x86/kvm/vmx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index b680c2e..326f6ea 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4935,6 +4935,7 @@ static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
 	vmx_set_efer(vcpu, 0);
 	vmx_fpu_activate(vcpu);
 	update_exception_bitmap(vcpu);
+	vmx_set_rflags(vcpu, X86_EFLAGS_FIXED);
 
 	vpid_sync_context(vmx->vpid);
 }
-- 
1.9.1

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