Re: [Xen-devel] libxl: error: ... PCI Device is not assignable

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-02-17 at 22:56 +0000, Matthew Hook wrote:
> I think this is a bug in the xl toolchain.

I agree.

Which version of Xen are you running? There have been various fixes to
the stuff in xen-unstable but from your error message (which doesn't
appear in the unstable code base AFAICT) I guess you are running 4.1.
Are you able to try unstable?

> lspci -s 0000:12:0.*
> 12:00.0 Display controller: ATI Technologies Inc Device 671d
> 12:00.1 Audio device: ATI Technologies Inc Device aa80
> 
> sudo xm pci-list-assignable-devices

NB: it is not recommended to mix and match xm and xl. 

> 0000:13:00.0
> 0000:13:00.1
> 0000:12:00.0
> 0000:12:00.1
> 
> So there is a multi-function device (actually one ASIC of a AMD Radeon
> 6990 card).
> It has two function addresses 0 = Display controller, 1 = Audio Device.
> 
> However when running xl create where the line for pci is of the form
> pci=['12:00.*']
> Where * means pass through all devices, you get an error as below.
> 
> Parsing config file xenwin7-1.cfg
> xc: info: VIRTUAL MEMORY ARRANGEMENT:
>   Loader:        0000000000100000->0000000000179830
>   TOTAL:         0000000000000000->000000007f800000
>   ENTRY ADDRESS: 0000000000100000
> xc: info: PHYSICAL MEMORY ALLOCATION:
>   4KB PAGES: 0x0000000000000200
>   2MB PAGES: 0x00000000000003fb
>   1GB PAGES: 0x0000000000000000
> libxl: error: libxl_pci.c:790:libxl__device_pci_add PCI device
> 0:12:0.70 is not assignable
> 
> There is no function 70 on that device.

The * turns into a "LIBXL_PCI_FUNC_ALL (~0U)" in the internal
represenation, I bet this is some sort unhelpful and confusing of
formatting snafu related to that.

> In relation to that, the BDF documentation
> (http://wiki.xensource.com/xenwiki/BDFNotation) seems to imply that
> you can specify
> the extended BDF notation on your kernel boot line in grub.  i.e.
> xen-pciback.hide=(0000:12:00.*) does not work.  You'll get an error in
> the kernel log.

That is the old wiki, the new page seems to be
http://wiki.xen.org/wiki/Bus:Device.Function_(BDF)_Notation -- does this
still give you that impression? Please feel free to update to clarify.

> Actually, if you look at the code for pci_stub.c in the linux kernel
> (at least for Jeremy branch 2.6.32.48), extended BDF is not supported.

Right, I think that wiki page is trying to refer only to the notation
used by the toolstack. I imagine that could be clearer.

Ian.


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