[PATCH 4/4] KVM: SVM: Delay legacy platform initialization on SNP

[Dionna Glaze]

When no SEV or SEV-ES guests are active, then the firmware can be
updated while (SEV-SNP) VM guests are active.

CC: Sean Christopherson <seanjc@xxxxxxxxxx>
CC: Paolo Bonzini <pbonzini@xxxxxxxxxx>
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxxxxx>
CC: Borislav Petkov <bp@xxxxxxxxx>
CC: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>

Co-authored-by: Ashish Kalra <ashish.kalra@xxxxxxx>
Change-Id: I3efb5fbbd0da05ab29f85504a86693f5cdf49050
Signed-off-by: Dionna Glaze <dionnaglaze@xxxxxxxxxx>
---
 arch/x86/kvm/svm/sev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index f6e96ec0a5caa..8d365e2e3c1b1 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -445,6 +445,8 @@ static int __sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp,
 		goto e_no_asid;
 
 	init_args.probe = false;
+	init_args.supports_download_firmware_ex =
+		vm_type != KVM_X86_SEV_VM && vm_type != KVM_X86_SEV_ES_VM;
 	ret = sev_platform_init(&init_args);
 	if (ret)
 		goto e_free;
-- 
2.47.0.163.g1226f6d8fa-goog