[PATCH] x86/kvm/nVMX: don't skip emulated instruction twice when vmptr address is not backed

[Vitaly Kuznetsov]

Since commit 09abb5e3e5e50 ("KVM: nVMX: call kvm_skip_emulated_instruction
in nested_vmx_{fail,succeed}") nested_vmx_failValid() results in
kvm_skip_emulated_instruction() so doing it again in handle_vmptrld() when
vmptr address is not backed is wrong, we end up advancing RIP twice.

Fixes: fca91f6d60b6e ("kvm: nVMX: Set VM instruction error for VMPTRLD of 
unbacked page")
Reported-by: Cornelia Huck <coh...@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
---
 arch/x86/kvm/vmx/nested.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 3170e291215d..2616bd2c7f2c 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4540,9 +4540,8 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
                         * given physical address won't match the required
                         * VMCS12_REVISION identifier.
                         */
-                       nested_vmx_failValid(vcpu,
+                       return nested_vmx_failValid(vcpu,
                                VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
-                       return kvm_skip_emulated_instruction(vcpu);
                }
                new_vmcs12 = kmap(page);
                if (new_vmcs12->hdr.revision_id != VMCS12_REVISION ||
-- 
2.20.1