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Re: [Qemu-devel] Make NVME device "migratable" (savevm)

From: Keith Busch
Subject: Re: [Qemu-devel] Make NVME device "migratable" (savevm)
Date: Tue, 29 Aug 2017 16:40:55 -0400
User-agent: Mutt/1.7.1 (2016-10-04)

On Tue, Aug 29, 2017 at 11:09:36AM +0100, Stefan Hajnoczi wrote:
> On Fri, Aug 25, 2017 at 11:39:30AM +0300, Sergei Dyshel wrote:
> > Hi all,
> > From what I understand, I can't "savevm" a VM that uses NVME device because
> > it has ".unmigratable = 1" in the code. What support must be implemented in
> > order to make it "migratable"?
> CCing Keith Busch, the NVMe maintainer.

To make it migratable, you'll need implement the VMStateDescription to
save and restore the entire controller state, including all the queues.
It doesn't actually look like there's a much state to track compared to
other migratale devices, I just never got any time to write it out.

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