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authorJim Mattson <jmattson@google.com>2017-07-17 12:00:34 -0700
committerRadim Krčmář <rkrcmar@redhat.com>2017-07-19 16:19:13 +0200
commitb3f1dfb6e818a2352c38e3e37bb983eae98621b5 (patch)
treed2b5e4c1bc538499a563ccf3f6393882866089d1 /arch
parent4c4a6f790ee862ee9f0dc8b35c71f55bcf792b71 (diff)
downloadlinux-b3f1dfb6e818a2352c38e3e37bb983eae98621b5.tar.bz2
KVM: nVMX: Disallow VM-entry in MOV-SS shadow
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/vmx.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a0c472bcb2a2..791c018a0034 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -10492,6 +10492,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
{
struct vmcs12 *vmcs12;
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 interrupt_shadow = vmx_get_interrupt_shadow(vcpu);
u32 exit_qual;
int ret;
@@ -10516,6 +10517,12 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
* 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