diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2019-08-13 15:53:31 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-08-22 10:09:19 +0200 |
| commit | 97413d2981bb3619a9d39f0b611318664d7231f5 (patch) | |
| tree | 59386ea81b7e964cb9ecdab2e3dc189bbaaf606d /arch/x86/kvm | |
| parent | f8ea7c6049d5d0766b84c8107583ed0094773d06 (diff) | |
x86: KVM: clear interrupt shadow on EMULTYPE_SKIP
When doing x86_emulate_instruction(EMULTYPE_SKIP) interrupt shadow has to
be cleared if and only if the skipping is successful.
There are two immediate issues:
- In SVM skip_emulated_instruction() we are not zapping interrupt shadow
in case kvm_emulate_instruction(EMULTYPE_SKIP) is used to advance RIP
(!nrpip_save).
- In VMX handle_ept_misconfig() when running as a nested hypervisor we
(static_cpu_has(X86_FEATURE_HYPERVISOR) case) forget to clear interrupt
shadow.
Note that we intentionally don't handle the case when the skipped
instruction is supposed to prolong the interrupt shadow ("MOV/POP SS") as
skip-emulation of those instructions should not happen under normal
circumstances.
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 73825abb92b3..90a895de5e43 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6546,6 +6546,7 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, kvm_rip_write(vcpu, ctxt->_eip); if (ctxt->eflags & X86_EFLAGS_RF) kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF); + kvm_x86_ops->set_interrupt_shadow(vcpu, 0); return EMULATE_DONE; } |