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

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:


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

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.


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