commit 030421334ae91b7f6302a1cfe9c971a8991b4870
Author: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Date:   Wed Jun 20 11:20:04 2007 +0300

    KVM: VMX: Reinitialize the real-mode tss when entering real mode
    
    Protected mode code may have corrupted the real-mode tss, so re-initialize
    it when switching to real mode.
    
    Signed-off-by: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index b47ddcc..42a9163 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -31,6 +31,8 @@
 MODULE_AUTHOR("Qumranet");
 MODULE_LICENSE("GPL");
 
+static int init_rmode_tss(struct kvm *kvm);
+
 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
 
@@ -951,6 +953,8 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
 	fix_rmode_seg(VCPU_SREG_DS, &vcpu->rmode.ds);
 	fix_rmode_seg(VCPU_SREG_GS, &vcpu->rmode.gs);
 	fix_rmode_seg(VCPU_SREG_FS, &vcpu->rmode.fs);
+
+	init_rmode_tss(vcpu->kvm);
 }
 
 #ifdef CONFIG_X86_64