[Pkg-xen-devel] Bug#748052: [Xen-devel] dom0 USB failing with "ehci-pci: probe of 0000:00:1d.0 failed with error -110"

[Ross Philipson]

On 05/16/2014 06:08 AM, Jan Beulich wrote:
>>>> On 16.05.14 at 10:58, <ijc at hellion.org.uk> wrote:
>> So it seems like dom0 is unable to (correctly) bind to some hardware
>> interrupts. I wonder if these messages from Xen's dmesg are relevant.
>> (XEN) Not enabling x2APIC: depends on iommu_supports_eim.
>> (XEN) I/O virtualisation disabled
>> (XEN) Enabled directed EOI with ioapic_ack_old on!
>
> The last one certainly isn't, and the first two shouldn't (albeit the
> non-Xen kernel is running in x2APIC mode). That difference is likely
> because the Xen and non-Xen boots are with differing BIOS
> configurations, or on different machines: The non-Xen boot shows
> a DMAR ACPI table, while the Xen one doesn't.

Doesn't Xen hide the DMAR from dom0 on purpose? I think it renames it to 
XMAR IIRC.

> Or wait, no, the
> hypervisor and kernel-under-Xen logs differ in that respect too. We
> clearly need a consistent set of logs.
>
> The one clearly odd thing in the hypervisor logs are these two lines
>
> (XEN) traps.c:3061: GPF (0000): ffff82c4c0186a91 -> ffff82c4c0218daa
> (XEN) traps.c:3061: GPF (0000): ffff82c4c0186a91 -> ffff82c4c0218daa
>
> Can at least the left side address please be associated back with a
> symbol (with the help of xen-syms perhaps)?
>
> And finally, looking at the IRQ usage, this
>
> [    2.087722] xen: registering gsi 22 triggering 0 polarity 1
> [    2.087731] xen: --> pirq=22 -> irq=22 (gsi=22)
> [    2.100161] xen: registering gsi 20 triggering 0 polarity 1
> [    2.100166] xen: --> pirq=20 -> irq=20 (gsi=20)
>
> happens rather early - it's not clear to me in which context that is.
> And there's no problem with GSI 22 used by the other EHCI HC, so
> a fundamental question is what other device(s) is/are using GSI 20
> (not visible from the non-Xen kernel log).
>
> Jan
>
>
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-- 
Ross Philipson