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

["Hao, Xudong" <xudong.hao@xxxxxxxxx>]

> -----Original Message-----
> From: Julien Grall [mailto:julien.grall@xxxxxxxxxx]
> Sent: Thursday, November 9, 2017 10:37 PM
> To: Roger Pau Monné <roger.pau@xxxxxxxxxx>; Hao, Xudong
> <xudong.hao@xxxxxxxxx>
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>; Lars Kurth
> <lars.kurth@xxxxxxxxxx>; Quan Xu <quan.xu0@xxxxxxxxx>; Kang, Luwei
> <luwei.kang@xxxxxxxxx>; Zhang, PengtaoX <pengtaox.zhang@xxxxxxxxx>; Julien
> Grall <julien.grall@xxxxxxx>; Jan Beulich <JBeulich@xxxxxxxx>; Xen-devel
> <xen-devel@xxxxxxxxxxxxxxxxxxxx>; Anthony PERARD
> <anthony.perard@xxxxxxxxxx>; Wei Liu <wei.liu2@xxxxxxxxxx>
> Subject: Re: [Xen-devel] [BUG] win2008 guest cannot get ip through sriov
> 
> On 09/11/17 14:36, Julien Grall wrote:
> > Hi Roger,
> >
> > On 09/11/17 09:27, Roger Pau Monné wrote:
> >> On Thu, Nov 09, 2017 at 12:22:49AM +0000, Hao, Xudong wrote:
> >>>> Qemu-xen didn't have commit a80363, so I report this issue to ask
> >>>> for sync up with qemu upstream. Last mail I mean I usually used
> >>>> Qemu Xen tree to do test, and found out this issue.
> >>>>
> >>>> Before requesting the backport, have you tested whether it fixes
> >>>> your issues?
> >>>>
> >>>
> >>> Yes, Luwei (Cced) tested it with pass result.
> >>
> >> In which case requesting a backport would be in place on the grounds
> >> that's a bug fix.
> >>
> >> The patch in question fixes a bug mostly seen when doing
> >> PCI-passthrough of devices that support MSI-X interrupts to Windows
> >> guest (and Windows attempts to setup the interrupts using MSI-X). It
> >> doesn't manifest on Linux or FreeBSD because these OSes use a
> >> different dance to setup MSI-X interrupts, and thus are not affected.
> >> It's likely that other OSes with different MSI-X implementations are
> >> able to trigger that bug. The result of not having the patch is that
> >> interrupts of passed through devices will stay masked, thus
> >> preventing the device from working (unless polling mode only is
> >> used).
> >>
> >> Pros:
> >>   - It fixes a bug.
> >>   - The patch is not very big or intrusive.
> >>
> >> Cons:
> >>   - It hasn't been tested as it's not in qemu-xen.
> >>   - Only Windows is affected by the bug AFAIK.
> >>
> >> IMHO, iff the backport is accepted it should be performed ASAP, so
> >> that the patch can be properly tested before the release.
> >
> > Thank you for the detailed explanation :). On a previous e-mail
> > Stefano were happy with the backport. So:
> >
> > Release-acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
> 
> Note that I think we would need to update xen also to point to the commit with
> this backport included.
> 

Confirmed Xen 4.10 RC5 cleans away this issue.


Thanks,
-Xudong

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