KVM: VMX: Return correct CPL during transition to protected mode

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>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e10ec0e4d1c69b7ba12b3ce8baa0c26d4605405d..486db2f9561b78634fb16c405543b034f8c9df1f 100644 (file)
--- 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;
 }