Re: [Xen-devel] [BUG] win2008 guest cannot get ip through sriov

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Nov 03, 2017 at 01:10:26AM +0000, Hao, Xudong wrote:
> 
> > -----Original Message-----
> > From: Julien Grall [mailto:julien.grall@xxxxxxxxxx]
> > Sent: Thursday, November 2, 2017 9:50 PM
> > To: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> > Cc: Hao, Xudong <xudong.hao@xxxxxxxxx>; Jan Beulich <JBeulich@xxxxxxxx>;
> > Quan Xu <quan.xu0@xxxxxxxxx>; Lars Kurth <lars.kurth@xxxxxxxxxx>; Wei Liu
> > <wei.liu2@xxxxxxxxxx>; Zhang, PengtaoX <pengtaox.zhang@xxxxxxxxx>; Kang,
> > Luwei <luwei.kang@xxxxxxxxx>; Julien Grall <julien.grall@xxxxxxx>; Anthony
> > PERARD <anthony.perard@xxxxxxxxxx>; Xen-devel <xen-
> > devel@xxxxxxxxxxxxxxxxxxxx>
> > Subject: Re: [Xen-devel] [BUG] win2008 guest cannot get ip through sriov
> > 
> > Hi,
> > 
> > On 27/10/17 21:16, Stefano Stabellini wrote:
> > > On Fri, 27 Oct 2017, Julien Grall wrote:
> > >> On 27/10/17 08:27, Hao, Xudong wrote:
> > >>> This bug exist much long time, there are many discussion last year
> > >>> but not a solution then. I call out it now because there is a fix in 
> > >>> qemu
> > upstream:
> > >>> commit a8036336609d2e184fc3543a4c439c0ba7d7f3a2
> > >>> Author: Roger Pau Monne <roger.pau@xxxxxxxxxx>
> > >>> Date:   Thu Aug 24 16:07:03 2017 +0100
> > >>>
> > >>>       xen/pt: allow QEMU to request MSI unmasking at bind time
> > >>>
> > >>> The fix is not in qemu-xen tree yet, when will qemu-xen sync this
> > >>> fix? Is it possible to catch Xen 4.10's qemu-xen?
> > >>
> > >> I will let Stefano and Anthony providing feedback before giving a
> > >> release-ack here.
> > >
> > > Yes, I think we should backport the commit as it fixes a genuine bug.
> > > The backport is not risk-free but it only affects PCI Passthrough.
> > > Also the commit has been in QEMU for 2 months now.
> > 
> > Does anyone actually tested it with QEMU Xen tree?
> > 
> 
> Qemu Xen tree is default which is in Xen source code configuration file 
> Config.mk, I tested it with it.
> QEMU_UPSTREAM_URL ?= http://xenbits.xen.org/git-http/qemu-xen.git

Can you please make sure you have QEMU commit a80363: xen/pt: allow
QEMU to request MSI unmasking at bind time. AFAICT this is not yet in
the qemu-xen tree.

Roger.

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