Commit a4d3326c authored Dec 11, 2012 by Gleb Natapov Committed by Marcelo Tosatti Dec 11, 2012

KVM: VMX: fix DPL during entry to protected mode



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 c865c43d.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

parent 0ca0d818

arch/x86/kvm/vmx.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);