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KVM: VMX: fix DPL during entry to protected mode

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On CPUs without support for unrestricted guests DPL cannot be smaller
than RPL for data segments during guest entry, but this state can occurs
if a data segment selector changes while vcpu is in real mode to a value
with lowest two bits != 00. Fix that by forcing DPL == RPL on transition
to protected mode.

This is a regression introduced by c865c43de6.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2012-12-11 15:14:10 +02:00 committed by Marcelo Tosatti
parent 0ca0d818cb
commit a4d3326c2d
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/vmx.c
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@ -2766,6 +2766,7 @@ static void fix_pmode_dataseg(struct kvm_vcpu *vcpu, int seg, struct kvm_segment
if (!(vmcs_readl(sf->base) == tmp.base && tmp.s)) {
tmp.base = vmcs_readl(sf->base);
tmp.selector = vmcs_read16(sf->selector);
tmp.dpl = tmp.selector & SELECTOR_RPL_MASK;
tmp.s = 1;
}
vmx_set_segment(vcpu, &tmp, seg);