linux-kernel - [PATCH RFC v9 43/51] KVM: SEV: Configure MMU to check for private fault flags

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Message-ID: <20230612042559.375660-44-michael.roth@amd.com>
Date:   Sun, 11 Jun 2023 23:25:51 -0500
From:   Michael Roth <michael.roth@....com>
To:     <kvm@...r.kernel.org>
CC:     <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
        <linux-crypto@...r.kernel.org>, <x86@...nel.org>,
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Subject: [PATCH RFC v9 43/51] KVM: SEV: Configure MMU to check for private fault flags

SEV-SNP uses a #NPF flag to indicate whether the guest expects a shared
or a private page, which in turn dictates whether the KVM MMU should
map a normal page or a gmem page. Set the appropriate mask to enable
this handling for SEV-SNP guests.

Signed-off-by: Michael Roth <michael.roth@....com>
---
 arch/x86/kvm/svm/sev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index ec74ff5e09c7..909ecd90d199 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2006,6 +2006,8 @@ static int snp_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
 	if (rc)
 		goto e_free_context;
 
+	kvm->arch.mmu_private_fault_mask = PFERR_GUEST_ENC_MASK;
+
 	return 0;
 
 e_free_context:
-- 
2.25.1