linux-kernel - Re: [RFC PATCH 0/5] Extend SEV-SNP SVSM support with a kvm

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Message-ID: <8db215c5-4393-4db1-883c-431fed9dfd59@redhat.com>
Date: Wed, 23 Oct 2024 13:48:57 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>,
 James Bottomley <James.Bottomley@...senpartnership.com>
Cc: roy.hopkins@...e.com, ashish.kalra@....com, bp@...en8.de,
 dave.hansen@...ux.intel.com, jroedel@...e.de, kvm@...r.kernel.org,
 linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
 michael.roth@....com, mingo@...hat.com, tglx@...utronix.de,
 thomas.lendacky@....com, x86@...nel.org
Subject: Re: [RFC PATCH 0/5] Extend SEV-SNP SVSM support with a kvm_vcpu per
 VMPL

On 10/21/24 21:51, Sean Christopherson wrote:
> On Fri, Oct 18, 2024, James Bottomley wrote:
>>> I've prepared this series as an extension to the RFC patch series:
>>> 'SEV-SNP support for running an SVSM' posted by Tom Lendacky [1].
>>> This extends the support for transitioning a vCPU between VM
>>> Privilege Levels (VMPLs) by storing the vCPU state for each VMPL in
>>> its own `struct kvm_vcpu`. This additionally allows for separate
>>> APICs for each VMPL.
>>
>> I couldn't attend KVM forum, but I understand based on feedback at a
>> session there, Paolo took the lead to provide an architecture document
>> for this feature, is that correct?
> 
> Yep.
> 
>> Just asking because I haven't noticed anything about this on the list.
> 
> Heh, there's quite a queue of blocked readers (and writers!) at this point ;-)

Well, at least one person had a writer's block instead.

I had it almost ready but then noticed a few hiccups in the design we 
came up with, and have been seating on it for a while.  I'm sending it 
now, finishing the commit messages.

Paolo