Re: [Xen-devel] GPLPV and pci passthrough

[<djmagee@xxxxxxxxxxxx>]

I checked, and no devices are sharing IRQs.  I'll try the
windows2003/ndis5 drivers and see if that makes a difference.  Of
course, the base image for my win7 vms seems to have gotten corrupted,
so I'll have to build a new one.

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
> Sent: Wednesday, January 25, 2012 7:23 PM
> To: djmagee@xxxxxxxxxxxx; lta@xxxxxx
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] GPLPV and pci passthrough
> 
> >
> > James,
> >     At least one other person (Lta, included in this message) and I
> have
> > had problems using passthrough pci devices and your GPLPV drivers at
> the
> > same time.  My symptoms are that SMB connections are totally
> unreliable
> > (however, downloading over http seems to work well enough).
> > For example, if I start a video or audio file, playing from the
> network, it will
> > play the first few seconds fine, then the connection drops out.
> > I can confirm that the problems don't exist when not passing through
> any
> > devices.
> >
> >     I'm using xen-unstable c/s 24465, 3.2.1 dom0, win 7 64bit domU
> with
> > an ATI 4770, USB controller, and ICE1712 based pci sound card passed
> > through.  I used the gplpv_Vista2008x64_0.11.0.308.msi drivers.
> >
> >     I tried the -debug drivers, and I see a ton of output in qemu
> log,
> > however, all that output seems to be at initialization.  I do not
see
> any
> > additional output from your drivers after boot, including when I'm
> > experiencing problems.
> >
> >     I took a quick look at tcpdump output and it does seem the guest
> is
> > ACKing the packets as they come in, so my first guess is that
they're
> getting
> > lost somewhere between the driver and the OS network stack.
> >
> >     I've never set up a build environment for these drivers so I
> haven't
> > tried adding any extra debug output.  Have you looked into the (or a
> similar)
> > problem before, or have a more verbose debug copy of the net driver
> you've
> > used to diagnose similar problems before?
> >
> >     I guess the real question is, do you have any idea where we
> should
> > start looking?
> >
> 
> I'd be first looking at interrupt sharing. Maybe GPLPV doesn't like
> sharing interrupts with anything?
> 
> Have a look in device manager and set the view as "Resources by type"
> and see if anything is sharing an interrupt with the "Xen PCI Device
> Driver".
> 
> James
> 
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