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From:   Michael Roth <michael.roth@amd.com>
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Subject: [PATCH RFC v7 58/64] KVM: SVM: Add module parameter to enable the SEV-SNP
Date:   Wed, 14 Dec 2022 13:40:50 -0600
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From: Brijesh Singh <brijesh.singh@amd.com>

Add a module parameter than can be used to enable or disable the SEV-SNP
feature. Now that KVM contains the support for the SNP set the GHCB
hypervisor feature flag to indicate that SNP is supported.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
---
 arch/x86/kvm/svm/sev.c | 7 ++++---
 arch/x86/kvm/svm/svm.h | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 8783b64557e5..b0f25ced7bcf 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -54,14 +54,15 @@ module_param_named(sev, sev_enabled, bool, 0444);
 /* enable/disable SEV-ES support */
 static bool sev_es_enabled = true;
 module_param_named(sev_es, sev_es_enabled, bool, 0444);
+
+/* enable/disable SEV-SNP support */
+static bool sev_snp_enabled = true;
+module_param_named(sev_snp, sev_snp_enabled, bool, 0444);
 #else
 #define sev_enabled false
 #define sev_es_enabled false
 #endif /* CONFIG_KVM_AMD_SEV */
 
-/* enable/disable SEV-SNP support */
-static bool sev_snp_enabled;
-
 #define AP_RESET_HOLD_NONE		0
 #define AP_RESET_HOLD_NAE_EVENT		1
 #define AP_RESET_HOLD_MSR_PROTO		2
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 277f53c903c2..4692ada13f02 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -708,7 +708,7 @@ void avic_set_virtual_apic_mode(struct kvm_vcpu *vcpu);
 #define GHCB_VERSION_MAX	2ULL
 #define GHCB_VERSION_MIN	1ULL
 
-#define GHCB_HV_FT_SUPPORTED	0
+#define GHCB_HV_FT_SUPPORTED	(GHCB_HV_FT_SNP | GHCB_HV_FT_SNP_AP_CREATION)
 
 extern unsigned int max_sev_asid;
 
-- 
2.25.1