linux-kernel - [PATCH RFC v8 49/56] KVM: SVM: Implement .fault_is

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Date:   Mon, 20 Feb 2023 12:38:40 -0600
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>,
        <linux-kernel@...r.kernel.org>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <jroedel@...e.de>, <thomas.lendacky@....com>,
        <hpa@...or.com>, <ardb@...nel.org>, <pbonzini@...hat.com>,
        <seanjc@...gle.com>, <vkuznets@...hat.com>, <jmattson@...gle.com>,
        <luto@...nel.org>, <dave.hansen@...ux.intel.com>, <slp@...hat.com>,
        <pgonda@...gle.com>, <peterz@...radead.org>,
        <srinivas.pandruvada@...ux.intel.com>, <rientjes@...gle.com>,
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        <vbabka@...e.cz>, <kirill@...temov.name>, <ak@...ux.intel.com>,
        <tony.luck@...el.com>, <marcorr@...gle.com>,
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        <alpergun@...gle.com>, <dgilbert@...hat.com>, <jarkko@...nel.org>,
        <ashish.kalra@....com>, <nikunj.dadhania@....com>
Subject: [PATCH RFC v8 49/56] KVM: SVM: Implement .fault_is_private callback for SNP

KVM MMU will use this to determine whether an #NPF should be serviced
with restricted memory or not.

Signed-off-by: Michael Roth <michael.roth@....com>
---
 arch/x86/kvm/svm/sev.c | 10 ++++++++++
 arch/x86/kvm/svm/svm.c |  1 +
 arch/x86/kvm/svm/svm.h |  2 ++
 3 files changed, 13 insertions(+)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 73d614c538da..7a74a92cb39a 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -4499,3 +4499,13 @@ int sev_update_mem_attr(struct kvm_memory_slot *slot, unsigned int attr,
 
 	return 0;
 }
+
+bool sev_fault_is_private(struct kvm *kvm, gpa_t gpa, u64 error_code, bool *private_fault)
+{
+	if (!sev_snp_guest(kvm))
+		return false;
+
+	*private_fault = (error_code & PFERR_GUEST_ENC_MASK) ? true : false;
+
+	return true;
+}
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index e2edc4700e55..18e4a6c17d11 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4861,6 +4861,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 
 	.adjust_mapping_level = sev_adjust_mapping_level,
 	.update_mem_attr = sev_update_mem_attr,
+	.fault_is_private = sev_fault_is_private,
 };
 
 /*
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 50a2bcaf3fd7..97038afa8020 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -728,6 +728,8 @@ void sev_snp_init_protected_guest_state(struct kvm_vcpu *vcpu);
 int sev_update_mem_attr(struct kvm_memory_slot *slot, unsigned int attr,
 			gfn_t start, gfn_t end);
 
+bool sev_fault_is_private(struct kvm *kvm, gpa_t gpa, u64 error_code, bool *private_fault);
+
 /* vmenter.S */
 
 void __svm_sev_es_vcpu_run(struct vcpu_svm *svm, bool spec_ctrl_intercepted);
-- 
2.25.1