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Re: [Xen-devel] Xen 4.2.1 boot failure with IOMMU enabled



On 02/12/2013 06:29 AM, Jan Beulich wrote:
On 12.02.13 at 12:22, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
On 12.02.13 at 12:15, povder <povder@xxxxxxxxx> wrote:
2013/2/12 Jan Beulich <JBeulich@xxxxxxxx>:
With the above, the patch is unlikely to address your problem,
but will likely provide better debugging output. So please
nevertheless try building with that patch included, assuming
the problem first started after you built Xen from a recent
4.2-testing tree (as opposed to this being plain 4.2.1, in which
case the problem is obviously unrelated to the recent changes
I'm thinking of).

I haven't built Xen myself, I use binaries from
http://au1.mirror.crc.id.au/repo/el6/x86_64/ repository and I guess
that builds in this repository are from plain 4.2.1.
xl info (when I boot with iommu disabled) shows:
xen_major              : 4
xen_minor              : 2
xen_extra              : .1

I just started using Xen when 4.2.1 already was released so this
problem appeared to me from the beginning. I can try with 4.2-testing
though.
No, there's no point I'm afraid. We really need to analyze the
debugging output to first understand what's missing.
All there is for bus 7 is

(XEN) AMD-Vi: IVHD Device Entry:
(XEN) AMD-Vi:  Type 0x2
(XEN) AMD-Vi:  Dev_Id 0x700
(XEN) AMD-Vi:  Flags 0x0

i.e. a single device at 07:00.0, yet from the register dump at the
crash it's fairly clear that we're talking about 07:00.1 here. I'm
afraid only a firmware update can help you here (or passing
"iommu=off" to Xen); in particular I can't see how we could work
around that problem in software.

I don't see any devices on bus 7 in lspci output (http://pastebin.com/raw.php?i=3wpKPQT9 from original report).

However the log shows

pci 0000:07:00.0: disabling ASPM on pre-1.1 PCIe device.  You can enable it 
with 'pcie_aspm=force'
..
(XEN) PCI add device 0000:07:00.0



-boris

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