KVM: SVM: Add module parameter to enable SEV-SNP

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 <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Signed-off-by: Ashish Kalra <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Michael Roth <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: codomania

arch/x86/kvm/svm/sev.c

@@ -49,7 +49,8 @@ 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;
+static bool sev_snp_enabled = true;
+module_param_named(sev_snp, sev_snp_enabled, bool, 0444);
 
 /* enable/disable SEV-ES DebugSwap support */
 static bool sev_es_debug_swap_enabled = true;