linux-kernel - Re: [RFC v2] KVM: x86: Support KVM VMs sharing SEV context

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Date:   Thu, 8 Apr 2021 12:48:56 -0700
From:   Steve Rutherford <srutherford@...gle.com>
To:     jejb@...ux.ibm.com
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Ashish Kalra <ashish.kalra@....com>,
        Nathan Tempelman <natet@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        X86 ML <x86@...nel.org>, KVM list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        dovmurik@...ux.vnet.ibm.com, lersek@...hat.com, frankeh@...ibm.com
Subject: Re: [RFC v2] KVM: x86: Support KVM VMs sharing SEV context

On Thu, Apr 8, 2021 at 10:43 AM James Bottomley <jejb@...ux.ibm.com> wrote:
>
> On Fri, 2021-04-02 at 16:20 +0200, Paolo Bonzini wrote:
> > On 02/04/21 13:58, Ashish Kalra wrote:
> > > Hi Nathan,
> > >
> > > Will you be posting a corresponding Qemu patch for this ?
> >
> > Hi Ashish,
> >
> > as far as I know IBM is working on QEMU patches for guest-based
> > migration helpers.
>
> Yes, that's right, we'll take on this part.
>
> > However, it would be nice to collaborate on the low-level (SEC/PEI)
> > firmware patches to detect whether a CPU is part of the primary VM
> > or the mirror.  If Google has any OVMF patches already done for that,
> > it would be great to combine it with IBM's SEV migration code and
> > merge it into upstream OVMF.
>
> We've reached the stage with our prototyping where not having the OVMF
> support is blocking us from working on QEMU.  If we're going to have to
> reinvent the wheel in OVMF because Google is unwilling to publish the
> patches, can you at least give some hints about how you did it?
>
> Thanks,
>
> James

Hey James,
It's not strictly necessary to modify OVMF to make SEV VMs live
migrate. If we were to modify OVMF, we would contribute those changes
upstream.

Thanks,
Steve