Re: [PATCH] KVM: x86: fix eflags state following processor init/reset

From: Wanpeng Li
Date: Tue Oct 27 2015 - 23:24:32 EST

Ping, :-)
On 10/21/15 2:28 PM, Wanpeng Li wrote:
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

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 <>
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_set_rflags(vcpu, X86_EFLAGS_FIXED);

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