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

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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 <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
This commit is contained in:
Gleb Natapov 2011-02-21 12:07:58 +02:00 • committed by Marcelo Tosatti
commit a8ba6c2622
1 changed files with 1 additions and 0 deletions
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1
arch/x86/kvm/vmx.c
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@ -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;