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authorGleb Natapov <gleb@redhat.com>2012-12-11 15:14:10 +0200
committerMarcelo Tosatti <mtosatti@redhat.com>2012-12-11 21:00:27 -0200
commita4d3326c2de46fd7bcc47d1e8786efccfc152f81 (patch)
tree62f62c8db52b530949001e3ca39c684da9387976 /arch/x86
parent0ca0d818cbcbcac75a02833861b6fc42a98b904e (diff)
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 c865c43de66dc97. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/vmx.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 1a30fd5c3fb2..feab3d973b68 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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);