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

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Message-ID: <35b66cd3-5124-4950-b8ca-d0e52f725e34@amd.com>
Date: Thu, 31 Oct 2024 03:17:12 -0500
From: "Kalra, Ashish" <ashish.kalra@....com>
To: Dionna Glaze <dionnaglaze@...gle.com>, 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: kvm@...r.kernel.org
Subject: Re: [PATCH 4/4] KVM: SVM: Delay legacy platform initialization on SNP

On 10/29/2024 1:39 PM, Dionna Glaze wrote:
> 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;

Reviewed-by: Ashish Kalra <ashish.kalra@....com>

Thanks,
Ashish