linux-kernel - RE: [RFC PATCH V2 0/3] IXGBE/VFIO: Add live migration support for SRIOV NIC

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Message-ID: <A12AC9D104E08D47BAF23C492F83C53B25CDE9E3@SHSMSX104.ccr.corp.intel.com>
Date:	Thu, 26 Nov 2015 03:15:35 +0000
From:	"Dong, Eddie" <eddie.dong@...el.com>
To:	Alexander Duyck <alexander.duyck@...il.com>,
	"Lan, Tianyu" <tianyu.lan@...el.com>
CC:	"a.motakis@...tualopensystems.com" <a.motakis@...tualopensystems.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	"b.reynal@...tualopensystems.com" <b.reynal@...tualopensystems.com>,
	"Bjorn Helgaas" <bhelgaas@...gle.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Jani, Nrupal" <nrupal.jani@...el.com>,
	Alexander Graf <agraf@...e.de>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
	"Tantilov, Emil S" <emil.s.tantilov@...el.com>,
	"Or Gerlitz" <gerlitz.or@...il.com>,
	"Rustad, Mark D" <mark.d.rustad@...el.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Eric Auger <eric.auger@...aro.org>,
	intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Vick, Matthew" <matthew.vick@...el.com>,
	"Williams, Mitch A" <mitch.a.williams@...el.com>,
	Netdev <netdev@...r.kernel.org>,
	"Nelson, Shannon" <shannon.nelson@...el.com>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	"zajec5@...il.com" <zajec5@...il.com>
Subject: RE: [RFC PATCH V2 0/3] IXGBE/VFIO: Add live migration support for
 SRIOV NIC

> On Wed, Nov 25, 2015 at 12:21 AM, Lan Tianyu <tianyu.lan@...el.com> wrote:
> > On 2015年11月25日 13:30, Alexander Duyck wrote:
> >> No, what I am getting at is that you can't go around and modify the
> >> configuration space for every possible device out there.  This
> >> solution won't scale.
> >
> >
> > PCI config space regs are emulation by Qemu and so We can find the
> > free PCI config space regs for the faked PCI capability. Its position
> > can be not permanent.
> 
> Yes, but do you really want to edit every driver on every OS that you plan to
> support this on.  What about things like direct assignment of regular Ethernet
> ports?  What you really need is a solution that will work generically on any
> existing piece of hardware out there.

The fundamental assumption of this patch series is to modify the driver in guest to self-emulate or track the device state, so that the migration may be possible.
I don't think we can modify OS, without modifying the drivers, even using the PCIe hotplug mechanism.  
In the meantime, modifying Windows OS is a big challenge given that only Microsoft can do. While, modifying driver is relatively simple and manageable to device vendors, if the device vendor want to support state-clone based migration.

Thx Eddie