linux-kernel - Re: [PART1 RFC 0/9] KVM: x86: Introduce SVM AVIC support

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Date:	Fri, 12 Feb 2016 21:05:22 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	joro@...tes.org, alex.williamson@...hat.com, gleb@...nel.org
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, wei@...hat.com,
	sherry.hurwitz@....com
Subject: Re: [PART1 RFC 0/9] KVM: x86: Introduce SVM AVIC support



On 12/02/2016 20:55, Suravee Suthikulpanit wrote:
>> Is it just this, or is there anything else?
> 
> For VM Migration, I meant the process of taking a snapshot of the VM and
> later on loading it back to resume where it left off, and not necessary
> to a different type of system. This would require saving off the VAPIC
> backing page of each vCPU along with the rest of per-VM AVIC data
> structures. IIUC, this might require changes in the QEmu as well.

It comes for free if you use regs for the backing page as I mentioned.
QEMU then manipulates the registers as usual throgh
KVM_GET_LAPIC/KVM_SET_LAPIC.  Same for non-AVIC <-> AVIC migration.

Paolo