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

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Message-ID: <20241029183907.3536683-5-dionnaglaze@google.com>
Date: Tue, 29 Oct 2024 18:39:04 +0000
From: Dionna Glaze <dionnaglaze@...gle.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>
Cc: Dionna Glaze <dionnaglaze@...gle.com>, Ashish Kalra <ashish.kalra@....com>, kvm@...r.kernel.org
Subject: [PATCH 4/4] KVM: SVM: Delay legacy platform initialization on SNP

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@...gle.com>
CC: Paolo Bonzini <pbonzini@...hat.com>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Ingo Molnar <mingo@...hat.com>
CC: Borislav Petkov <bp@...en8.de>
CC: Dave Hansen <dave.hansen@...ux.intel.com>

Co-authored-by: Ashish Kalra <ashish.kalra@....com>
Change-Id: I3efb5fbbd0da05ab29f85504a86693f5cdf49050
Signed-off-by: Dionna Glaze <dionnaglaze@...gle.com>
---
 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