linux-kernel - [Part2 PATCH v5 29/31] KVM: SVM: Clear C-bit from the page fault address

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Message-Id: <20171004131412.13038-30-brijesh.singh@amd.com>
Date:   Wed,  4 Oct 2017 08:14:10 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Brijesh Singh <brijesh.singh@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: [Part2 PATCH v5 29/31] KVM: SVM: Clear C-bit from the page fault address

When SEV is active, on #NPF the page fault address will contain the C-bit.
We must clear the C-bit before handling the fault.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: "Radim Krčmář" <rkrcmar@...hat.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Borislav Petkov <bp@...e.de>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: x86@...nel.org
Cc: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Reviewed-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Brijesh Singh <brijesh.singh@....com>
---
 arch/x86/kvm/svm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 5c2f5b15886c..a47981714433 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2439,7 +2439,7 @@ static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
 
 static int pf_interception(struct vcpu_svm *svm)
 {
-	u64 fault_address = svm->vmcb->control.exit_info_2;
+	u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
 	u64 error_code = svm->vmcb->control.exit_info_1;
 
 	return kvm_handle_page_fault(&svm->vcpu, error_code, fault_address,
-- 
2.9.5