Re: [Xen-devel] qemu-xen-dir + PCI passthrough = BOOM

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2013-12-18 at 14:48 +0000, Anthony PERARD wrote:
> On Mon, Dec 16, 2013 at 10:08:16AM -0500, Konrad Rzeszutek Wilk wrote:
> > On Fri, Dec 06, 2013 at 04:03:10PM +0000, Wei Liu wrote:
> > > On Fri, Dec 06, 2013 at 04:00:18PM +0000, Wei Liu wrote:
> > > [...]
> > > > > Those Xen report something like:
> > > > > (XEN) page_alloc.c:1460:d0 Over-allocation for domain 46: 131329 >
> > > > > 131328
> > > > > (XEN) memory.c:132:d0 Could not allocate order=0 extent: id=46
> > > > > memflags=0 (62 of 64)
> > > > > 
> > > > > ?
> > > > > 
> > > > > (I tryied to reproduce the issue by simply add many emulated e1000 in
> > > > > QEMU :) )
> > > > > 
> 
> > -bash-4.1# lspci -s 01:00.0 -v 
> > 01:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network 
> > Connection (rev 01)
> >         Subsystem: Intel Corporation Gigabit ET Dual Port Server Adapter
> >         Flags: fast devsel, IRQ 16
> >         Memory at fbc20000 (32-bit, non-prefetchable) [disabled] [size=128K]
> >         Memory at fb800000 (32-bit, non-prefetchable) [disabled] [size=4M]
> >         I/O ports at e020 [disabled] [size=32]
> >         Memory at fbc44000 (32-bit, non-prefetchable) [disabled] [size=16K]
> >         Expansion ROM at fb400000 [disabled] [size=4M]
> 
> BTW, I think this is the issue, the Expansion ROM. qemu-xen will
> allocate memory for it. Will have maybe have to find another way.
> qemu-trad those not seems to allocate memory, but I haven't been very
> far in trying to check that.

This might SeaBIOS, since it is the BIOS which runs the expansion roms.

ROMBIOS didn't run expansion ROMS, instead IIRC you have to extract the
ones you care about from the device(s) and build them into hvmloader
(somehow) to be predeployed.

Could try building a seabios without CONFIG_OPTIONROMS (edit
tools/firmware/seabios-config) and see if that helps -- although not if
there is some other essential option rom of course.

That's not the solution but it would help diagnose the issue.

Ian.


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