From: Sean Christopherson <seanjc@google.com>
To: "Jörg Rödel" <joro@8bytes.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
x86@kernel.org, Tom Lendacky <thomas.lendacky@amd.com>,
Michael Roth <michael.roth@amd.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
coconut-svsm@lists.linux.dev,
Joerg Roedel <joerg.roedel@amd.com>
Subject: Re: [PATCH 4/4] kvm: svm: Support KVM_SEV_SNP_PAGE_TYPE_VMSA at SNP_LAUNCH_UPDATE
Date: Thu, 11 Jun 2026 05:43:05 -0700 [thread overview]
Message-ID: <aiqtWVMqTK6vDoZ8@google.com> (raw)
In-Reply-To: <20260611123528.572255-5-joro@8bytes.org>
On Thu, Jun 11, 2026, Jörg Rödel wrote:
> From: Joerg Roedel <joerg.roedel@amd.com>
>
> Support setting a VMSA in guest physical memory during the SEV-SNP
> launch process. Only one VMSA can be provided which will then be used
> for the BSP. All of the APs will not have a VMSA allocated or assigned
> when this feature is used.
>
> This ensures stable launch measurements on SEV-SNP which are
> independent of the number of VCPUs the VM is launched with.
This needs a *much* longer explanation and more justification for exactly why
this needs to be handled in KVM. I understand most of the words and acronyms,
but that's about where my understanding stops.
next prev parent reply other threads:[~2026-06-11 12:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-11 12:35 [PATCH 0/4] KVM: SEV: Support direct setting of VMSA for SEV-SNP guests Jörg Rödel
2026-06-11 12:35 ` [PATCH 1/4] kvm: svm: Streamline VMSA setting for VCPUs Jörg Rödel
2026-06-11 12:56 ` sashiko-bot
2026-06-11 14:13 ` Jörg Rödel
2026-06-11 12:35 ` [PATCH 2/4] kvm: svm: Defer VMSA allocation to LAUNCH_FINISH stage Jörg Rödel
2026-06-11 12:58 ` sashiko-bot
2026-06-11 14:29 ` Jörg Rödel
2026-06-11 12:35 ` [PATCH 3/4] kvm: svm: Support guest-provided VMSA for launching Jörg Rödel
2026-06-11 13:05 ` sashiko-bot
2026-06-11 14:43 ` Jörg Rödel
2026-06-11 12:35 ` [PATCH 4/4] kvm: svm: Support KVM_SEV_SNP_PAGE_TYPE_VMSA at SNP_LAUNCH_UPDATE Jörg Rödel
2026-06-11 12:43 ` Sean Christopherson [this message]
2026-06-11 13:23 ` Jörg Rödel
2026-06-11 12:58 ` sashiko-bot
2026-06-11 15:23 ` Jörg Rödel
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