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

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Message-Id: <20200227132227.594460803@linuxfoundation.org>
Date:   Thu, 27 Feb 2020 14:36:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oliver Upton <oupton@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 099/113] KVM: nVMX: Dont emulate instructions in guest mode

From: Paolo Bonzini <pbonzini@...hat.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@...r.kernel.org
[Made commit, added commit msg - Oliver]
Signed-off-by: Oliver Upton <oupton@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.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)