From: Jim Mattson <jmattson@google.com>
Date: Mon, 17 Jul 2017 12:00:34 -0700
Subject: KVM: nVMX: Disallow VM-entry in MOV-SS shadow
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Patch-mainline: v4.13-rc2
Git-commit: b3f1dfb6e818a2352c38e3e37bb983eae98621b5
References: bsc#1077761
Immediately following MOV-to-SS/POP-to-SS, VM-entry is
disallowed. This check comes after the check for a valid VMCS. When
this check fails, the instruction pointer should fall through to the
next instruction, the ALU flags should be set to indicate VMfailValid,
and the VM-instruction error should be set to 26 ("VM entry with
events blocked by MOV SS").
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Acked-by: Alexander Graf <agraf@suse.de>
---
arch/x86/kvm/vmx.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -10467,6 +10467,7 @@
{
struct vmcs12 *vmcs12;
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 interrupt_shadow = vmx_get_interrupt_shadow(vcpu);
u32 exit_qual;
int ret;
@@ -10491,6 +10492,12 @@
* for misconfigurations which will anyway be caught by the processor
* when using the merged vmcs02.
*/
+ if (interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS) {
+ nested_vmx_failValid(vcpu,
+ VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS);
+ goto out;
+ }
+
if (vmcs12->launch_state == launch) {
nested_vmx_failValid(vcpu,
launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS