[PATCH v3 01/26] KVM: VMX: Return correct CPL during transition to protected mode

[Avi Kivity <avi@redhat.com>]

In protected mode, the CPL is defined as the lower two bits of CS, as set by
the last far jump.  But during the transition to protected mode, there is no
last far jump, so we need to return zero (the inherited real mode CPL).

Fix by reading CPL from the cache during the transition.  This isn't 100%
correct since we don't set the CPL cache on a far jump, but since protected
mode transition will always jump to a segment with RPL=0, it will always
work.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 arch/x86/kvm/vmx.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index eeeb4a2..8f2ddd9 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3175,11 +3175,22 @@ static int __vmx_get_cpl(struct kvm_vcpu *vcpu)
 
 static int vmx_get_cpl(struct kvm_vcpu *vcpu)
 {
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+	/*
+	 * If we enter real mode with cs.sel & 3 != 0, the normal CPL calculations
+	 * fail; use the cache instead.
+	 */
+	if (unlikely(vmx->emulation_required && emulate_invalid_guest_state)) {
+		return vmx->cpl;
+	}
+
 	if (!test_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail)) {
 		__set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
-		to_vmx(vcpu)->cpl = __vmx_get_cpl(vcpu);
+		vmx->cpl = __vmx_get_cpl(vcpu);
 	}
-	return to_vmx(vcpu)->cpl;
+
+	return vmx->cpl;
 }
 
 
-- 
1.7.11