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| author | Liran Alon <liran.alon@oracle.com> | 2017-11-05 16:56:32 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-05 11:26:32 +0100 |
| commit | 15cc35bc76f95d22d1e3e42617f6103568f19931 (patch) | |
| tree | 41a867918a8e4b8755a11681dd9f56f067dc8e4d /arch | |
| parent | 6c4eaffbad3701f037f1d60ca892dcbe7641ff74 (diff) | |
| download | linux-stable-15cc35bc76f95d22d1e3e42617f6103568f19931.tar.gz linux-stable-15cc35bc76f95d22d1e3e42617f6103568f19931.tar.bz2 linux-stable-15cc35bc76f95d22d1e3e42617f6103568f19931.zip | |
KVM: x86: Exit to user-mode on #UD intercept when emulator requires
commit 61cb57c9ed631c95b54f8e9090c89d18b3695b3c upstream.
Instruction emulation after trapping a #UD exception can result in an
MMIO access, for example when emulating a MOVBE on a processor that
doesn't support the instruction. In this case, the #UD vmexit handler
must exit to user mode, but there wasn't any code to do so. Add it for
both VMX and SVM.
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Wanpeng Li <wanpeng.li@hotmail.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/svm.c | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/vmx.c | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index ca209a4a7834..17fb6c6d939a 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -2189,6 +2189,8 @@ static int ud_interception(struct vcpu_svm *svm) int er; er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD); + if (er == EMULATE_USER_EXIT) + return 0; if (er != EMULATE_DONE) kvm_queue_exception(&svm->vcpu, UD_VECTOR); return 1; diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 21cad7068cbf..b21113bcf227 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -5914,6 +5914,8 @@ static int handle_exception(struct kvm_vcpu *vcpu) return 1; } er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD); + if (er == EMULATE_USER_EXIT) + return 0; if (er != EMULATE_DONE) kvm_queue_exception(vcpu, UD_VECTOR); return 1; |