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