linux-kernel - Re: [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature implicitly on Incoming VM(s).

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Date:   Sun, 6 Dec 2020 11:18:20 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ashish Kalra <ashish.kalra@....com>
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        joro@...tes.org, bp@...e.de, Thomas.Lendacky@....com,
        x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        srutherford@...gle.com, rientjes@...gle.com,
        venu.busireddy@...cle.com, brijesh.singh@....com
Subject: Re: [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature
 implicitly on Incoming VM(s).

On 04/12/20 22:46, Ashish Kalra wrote:
>> I would prefer that userspace does this using KVM_SET_MSR instead.
>
> Ok.
> 
> But, this is for a VM which has already been migrated based on feature
> support on host and guest and host negotation and enablement of the live
> migration support, so i am assuming that a VM which has already been
> migrated can have this support enabled implicitly for further migration.

It's just that it is a unexpected side effect of 
KVM_SET_PAGE_ENC_BITMAP.  I prefer to have it tied to the more obvious 
KVM_SET_MSR ioctl.

Paolo