[PATCH 4.4 099/113] KVM: nVMX: Dont emulate instructions in guest mode

Greg Kroah-Hartman
2020-02-27T13:45:04Z

From: Paolo Bonzini <pbonzini@redhat.com>

[ Upstream commit 07721feee46b4b248402133228235318199b05ec ]

vmx_check_intercept is not yet fully implemented. To avoid emulating
instructions disallowed by the L1 hypervisor, refuse to emulate
instructions by default.

Cc: stable@vger.kernel.org
[Made commit, added commit msg - Oliver]
Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kvm/vmx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -10759,7 +10759,7 @@ static int vmx_check_intercept(struct kv
}

/* TODO: check more intercepts... */
- return X86EMUL_CONTINUE;
+ return X86EMUL_UNHANDLEABLE;
}

static void vmx_sched_in(struct kvm_vcpu *vcpu, int cpu)