linux-kernel - Re: [Qemu-devel] [RFC Patch 00/12] IXGBE: Add live migration support for SRIOV NIC

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Message-ID: <1445518861.4059.869.camel@redhat.com>
Date:	Thu, 22 Oct 2015 07:01:01 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Or Gerlitz <gerlitz.or@...il.com>, emil.s.tantilov@...el.com,
	kvm@...r.kernel.org, linux-pci@...r.kernel.org,
	qemu-devel@...gnu.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	carolyn.wyborny@...el.com,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>, agraf@...e.de,
	matthew.vick@...el.com, intel-wired-lan@...ts.osuosl.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	yang.z.zhang@...el.com,
	Mitch Williams <mitch.a.williams@...el.com>,
	nrupal.jani@...el.com, bhelgaas@...gle.com,
	Lan Tianyu <tianyu.lan@...el.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Shannon Nelson <shannon.nelson@...el.com>,
	eddie.dong@...el.com, Linux Kernel <linux-kernel@...r.kernel.org>,
	john.ronciak@...el.com, Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [Qemu-devel] [RFC Patch 00/12] IXGBE: Add live migration
 support for SRIOV NIC

On Thu, 2015-10-22 at 15:32 +0300, Michael S. Tsirkin wrote:
> On Wed, Oct 21, 2015 at 01:20:27PM -0600, Alex Williamson wrote:
> > The trouble here is that the VF needs to be unplugged prior to the start
> > of migration because we can't do effective dirty page tracking while the
> > device is connected and doing DMA.
> 
> That's exactly what patch 12/12 is trying to accomplish.
> 
> I do see some problems with it, but I also suggested some solutions.

I was replying to:

> So... what would you expect service down wise for the following
> solution which is zero touch and I think should work for any VF
> driver:

And then later note:

"Here it's done via an enlightened guest driver."

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