linux-kernel - [PATCH 2/2] KVM: X86: Do the same ignore

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Message-Id: <20200622220442.21998-3-peterx@redhat.com>
Date:   Mon, 22 Jun 2020 18:04:42 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>, peterx@...hat.com,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH 2/2] KVM: X86: Do the same ignore_msrs check for feature msrs

Logically the ignore_msrs and report_ignored_msrs should also apply to feature
MSRs.  Add them in.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 arch/x86/kvm/svm/svm.c |  2 +-
 arch/x86/kvm/vmx/vmx.c |  2 +-
 arch/x86/kvm/x86.c     | 10 ++++++++--
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index a862c768fd54..8fae61d71d6b 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2346,7 +2346,7 @@ static int svm_get_msr_feature(struct kvm_msr_entry *msr)
 			msr->data |= MSR_F10H_DECFG_LFENCE_SERIALIZE;
 		break;
 	default:
-		return 1;
+		return KVM_MSR_RET_INVALID;
 	}
 
 	return 0;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 89c766fad889..42dbb3d0a2bd 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1772,7 +1772,7 @@ static int vmx_get_msr_feature(struct kvm_msr_entry *msr)
 			return 1;
 		return vmx_get_vmx_msr(&vmcs_config.nested, msr->index, &msr->data);
 	default:
-		return 1;
+		return KVM_MSR_RET_INVALID;
 	}
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b49eaf8a2ce5..1af37794377e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1392,8 +1392,7 @@ static int kvm_get_msr_feature(struct kvm_msr_entry *msr)
 		rdmsrl_safe(msr->index, &msr->data);
 		break;
 	default:
-		if (kvm_x86_ops.get_msr_feature(msr))
-			return 1;
+		return kvm_x86_ops.get_msr_feature(msr);
 	}
 	return 0;
 }
@@ -1405,6 +1404,13 @@ static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 
 	msr.index = index;
 	r = kvm_get_msr_feature(&msr);
+
+	if (r == KVM_MSR_RET_INVALID) {
+		/* Unconditionally clear the output for simplicity */
+		*data = 0;
+		r = kvm_msr_ignored_check(vcpu, index, 0, false);
+	}
+
 	if (r)
 		return r;
 
-- 
2.26.2