[Part2 PATCH v4 29/29] KVM: X86: Add CONFIG_KVM_AMD_SEV

[Brijesh Singh <brijesh.singh@amd.com>]

The config option can be used to enable SEV support on AMD Processors.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 arch/x86/kvm/Kconfig | 8 ++++++++
 arch/x86/kvm/svm.c   | 3 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 3ea624452f93..06d3d221a503 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -79,6 +79,14 @@ config KVM_AMD
 	  To compile this as a module, choose M here: the module
 	  will be called kvm-amd.
 
+config KVM_AMD_SEV
+	def_bool y
+	bool "AMD Secure Encrypted Virtualization (SEV) support"
+	depends on KVM_AMD
+	select CRYPTO_DEV_SP_PSP
+	---help---
+	Provides support for Encrypted VMs on AMD processors.
+
 config KVM_MMU_AUDIT
 	bool "Audit KVM MMU"
 	depends on KVM && TRACEPOINTS
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d997f63c765d..f9878efb808a 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1143,7 +1143,8 @@ static __init int svm_hardware_setup(void)
 		kvm_tsc_scaling_ratio_frac_bits = 32;
 	}
 
-	if (boot_cpu_has(X86_FEATURE_SEV))
+	if (boot_cpu_has(X86_FEATURE_SEV) &&
+	    IS_ENABLED(CONFIG_KVM_AMD_SEV))
 		sev_hardware_setup();
 
 	if (nested) {
-- 
2.9.5