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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

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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