From: Avi Kivity Date: Mon, 3 Jan 2011 12:28:51 +0000 (+0200) Subject: KVM: VMX: Save and restore tr selector across mode switches X-Git-Tag: v2.6.39-rc1~436^2~51 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d0ba64f9b4b3e41e7b91681fe04a334bc8bfc8f5;p=platform%2Fkernel%2Flinux-stable.git KVM: VMX: Save and restore tr selector across mode switches When emulating real mode we play with tr hidden state, but leave tr.selector alone. That works well, except for save/restore, since loading TR writes it to the hidden state in vmx->rmode. Fix by also saving and restoring the tr selector; this makes things more consistent and allows migration to work during the early boot stages of Windows XP. Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti --- diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index bf89ec2..a2e83a9 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1683,6 +1683,7 @@ static void enter_pmode(struct kvm_vcpu *vcpu) vmx->emulation_required = 1; vmx->rmode.vm86_active = 0; + vmcs_write16(GUEST_TR_SELECTOR, vmx->rmode.tr.selector); vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base); vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit); vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar); @@ -1756,6 +1757,7 @@ static void enter_rmode(struct kvm_vcpu *vcpu) vmx->emulation_required = 1; vmx->rmode.vm86_active = 1; + vmx->rmode.tr.selector = vmcs_read16(GUEST_TR_SELECTOR); vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE); vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));