Commit a8ba6c26 authored Feb 21, 2011 by Gleb Natapov Committed by Marcelo Tosatti Mar 17, 2011

KVM: VMX: update live TR selector if it changes in real mode



When rmode.vm86 is active TR descriptor is updated with vm86 task values,
but selector is left intact. vmx_set_segment() makes sure that if TR
register is written into while vm86 is active the new values are saved
for use after vm86 is deactivated, but since selector is not updated on
vm86 activation/deactivation new value is lost. Fix this by writing new
selector into vmcs immediately.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

parent a3b5ba49

arch/x86/kvm/vmx.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -2138,6 +2138,7 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu,
		u32 ar;

		if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) {
		vmcs_write16(sf->selector, var->selector);
		vmx->rmode.tr.selector = var->selector;
		vmx->rmode.tr.base = var->base;
		vmx->rmode.tr.limit = var->limit;

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