linux-kernel - Re: [PATCH 00/12] SEV Live Migration Patchset.

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Date:   Thu, 19 Mar 2020 17:24:51 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ashish Kalra <ashish.kalra@....com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        David Rientjes <rientjes@...gle.com>, X86 ML <x86@...nel.org>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH 00/12] SEV Live Migration Patchset.

On 19/03/20 17:18, Ashish Kalra wrote:
>>> For the second case, we have been discussing this internally,
>>> and one option is to extend the KVM capabilites/feature bits to check for this ?
>> You could extend the hypercall to completely block live migration (e.g.
>> a0=a1=~0, a2=0 to unblock or 1 to block).  The KVM_GET_PAGE_ENC_BITMAP
>> ioctl can also return the blocked/unblocked state.
>>
> Currently i have added a new KVM para feature
> "KVM_FEATURE_SEV_LIVE_MIGRATION" to indicate host support for the SEV
> live migration feature and a custom KVM MSR "MSR_KVM_SEV_LIVE_MIG_EN"
> for the guest to enable SEV live migration. The MSR also has other
> flags for future SEV live migration extensions.

Ok, that would be fine too.  Thanks!

Paolo