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

[Jan Beulich]

>>> On 16.05.14 at 16:48, <ross.philipson at citrix.com> wrote:
> 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.

Sure. It's XMAR in the kernel-on-Xen log, but there's no DMAR in
the Xen one.

Jan