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Re: [Xen-devel] Can create PV domain in 4.2 only with xm and not xl

On Sat, Oct 06, 2012 at 10:26:03AM +0200, Andi Reinbrech wrote:
> Hi Xenners,
> This problem has been cropping up since late 4.2-unstable builds:  I can
> create all my HVM guests (windows 7, 8, XP and XP64) with xl create, but
> my existing PV guests (Fedora based) don't start.  They either hang or
> time out with an error that they can't connect to a vbd backend device.
> This happens after the GRUB menu, so the bootloader is in fact accessed.
> The strangest thing is, that by starting xend and creating the same
> domain with xm create works 100%, but after stopping xend afterwards I
> cannot create any more domains with xl, because udev gets messed up
> between xm and xl.  Obviously I shouldn't, and don't want to mix the
> two.
> Another strange thing is that xl create on this same domain works fine
> on kernel 3.5...  But I can't use kernel >=3.5, as the PCI USB
> passthrough is broken.

The last of the patches for that should show up in the 3.5.x branch.
And also in 3.6. Look for:

Author: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date:   Tue Sep 25 16:48:24 2012 -0400

    xen/pciback: Restore the PCI config space after an FLR.

> So I am sitting with a catch-22: use kernel 3.5/3.6 and have xl work for
> all domains, but can't use my HVM Windows machine that needs PCI
> passthrough for VGA and USB, or use only kernel 3.3.4, but can't start
> PV domains unless I use xend.

> Any suggestions would be appreciated!  If I need to send configs or
> logs, please let me know.
> Kind regards,
> Andi
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