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

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Message-ID: <20210226133023.GA5950@ashkalra_ubuntu_server>
Date:   Fri, 26 Feb 2021 13:30:23 +0000
From:   Ashish Kalra <ashish.kalra@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     James Bottomley <James.Bottomley@...senPartnership.com>,
        natet@...gle.com, brijesh.singh@....com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, rientjes@...gle.com,
        seanjc@...gle.com, srutherford@...gle.com, thomas.lendacky@....com,
        x86@...nel.org, Tobin Feldman-Fitzthum <tobin@....com>,
        DOV MURIK <Dov.Murik1@...ibm.com>
Subject: Re: [RFC] KVM: x86: Support KVM VMs sharing SEV context

On Thu, Feb 25, 2021 at 09:33:09PM +0100, Paolo Bonzini wrote:
> On 25/02/21 19:18, Ashish Kalra wrote:
> > I do believe that some of these alternative SEV live migration support
> > or Migration helper (MH) solutions will still use SEV PSP migration for
> > migrating the MH itself, therefore the SEV live migration patches
> > (currently v10 posted upstream) still make sense and will be used.
> 
> I think that since the migration helper (at least for SEV, not -ES) is part
> of the attested firmware, it can be started on the destination before the
> rest of the VM.
> 

We may also need to transport VMSA(s) securely using the PSP migration
support for SEV-ES live migration with MH.

Thanks,
Ashish