linux-kernel - [PATCH] KVM: x86: filter guest NX capability for cpuid2

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Message-Id: <20201005145921.84848-1-tianjia.zhang@linux.alibaba.com>
Date:   Mon,  5 Oct 2020 22:59:21 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
Subject: [PATCH] KVM: x86: filter guest NX capability for cpuid2

Original KVM_SET_CPUID has removed NX on non-NX hosts as it did
before. but KVM_SET_CPUID2 does not. The two should be consistent.

Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
---
 arch/x86/kvm/cpuid.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 3fd6eec202d7..3e7ba2b11acb 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -257,6 +257,7 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
 		goto out;
 	}
 
+	cpuid_fix_nx_cap(vcpu);
 	kvm_update_cpuid_runtime(vcpu);
 	kvm_vcpu_after_set_cpuid(vcpu);
 out:
-- 
2.24.3 (Apple Git-128)