Re: [Xen-devel] PCI hole resize support for 4.5? If not, workaround?

[Don Slutz <dslutz@xxxxxxxxxxx>]

On 10/20/14 13:14, Steve Freitas wrote:
> On 10/20/2014 6:06, Don Slutz wrote:
> > On 10/18/14 02:17, Steve Freitas wrote:
> > > Hi all,
> > >
> > > I'm suffering from bug 28 [1], unable to assign more than 3.5 gigs 
> > > of RAM to my Windows VM while using VGA passthrough. This is a 
> > > showstopper for me.
> > > Since #28 is still listed as up for grabs for 4.5 [2], I assume a 
> > > fix is not likely to make it in. However, a message from Ian [3] 
> > > indicated that a workaround was available at some point. Will a 
> > > workaround be offered for 4.4 or 4.5?
> > Adding the patch:
> >
> > http://lists.xenproject.org/archives/html/xen-devel/2014-10/msg01447.html 
> >
> > to 4.5-unstable
> >
> > and adding
> >
> > mmio_hole_size = 536870912
> >
> > to your .xfg should allow you to use more memory (the number above
> > is .5 gig, which should work based on 3.5 gigs working).
> Hi Don!
>
> Thanks for your reply and the patch, my searches didn't turn up your 
> post. Any idea if I'll run into trouble trying to apply this to 4.4.1?
This does require a changed QEMU.  QEMU 2.1 (2.1.2 is the current 
released version)
or the QEMU for Xen 
(http://xenbits.xen.org/git-http/qemu-upstream-unstable.git) in
4.5 will work.

> I'd like to stick with (minimally modified) distro packages if 
> possible, and Debian Jessie is on 4.4.1. And any feeling for whether 
> this will make it into 4.5?
I think it still has a good chance.  Just posted v8, name changed from 
mmio_hole_size
to mmio_hole and the units changed from bytes to MBYTES.  So with v8 you
say:

mmio_hole = 512


> Sure would be nice to see this problem fixed for good.
The change to 4.5 is not a complete fix, but a good 1st step.

   -Don Slutz

> Thanks again.
>
> Steve

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