Re: [Xen-devel] VMX test report for Xen 4.4-unstable-C/S 27314

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.08.13 at 07:45, "Xu, YongweiX" <yongweix.xu@xxxxxxxxx> wrote:
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> >>> On 12.08.13 at 05:43, "Liu, SongtaoX" <songtaox.liu@xxxxxxxxx> wrote:
>> >> >>> On 08.08.13 at 09:13, "Ren, Yongjie" <yongjie.ren@xxxxxxxxx> wrote:
>> >> > 2. device pass-through works even if VT-d is disabled in BIOS
>> >> >
>> >> > http://bugzilla-archived.xenproject.org//bugzilla/show_bug.cgi?id=1 
>> >> > 866
>> >>
>> >> Are you sure this was seen with 27314:e6ca87e13937? I ask because
>> >> 27204:06c2f6031aff is supposed to be taking care of this (and it did
>> >> in my
>> > and - I
>> >> think - also in others' testing). To make things even less clear, the
>> >> bug
>> > itself
>> >> mentions 27203 and 27214...
>> >>
>> > Yes, it also exists in c/s 27204:06c2f6031aff, 27324:e9c802e5acc9.
>> > vt-d function had been disabled in BIOS, with "iommu=0" in grub line,
>> > "xl pci-assignable-add", "xl pci-attach" still works, and could
>> > passthrough to hvm guest, but the attached PCI device could not get
>> > IP.
>> 
>> Please provide proof of that (logs + xl output) - I don't really trust this 
>> given the
>> already mentioned confusion about changesets in the bug vs the report here.
> 
> I find this issue exist in IVT-EP but not exist in SNB-EP or HSW desktop.

Now that's really odd of course. And it means that someone with
access to an affected system will need to do some investigation
at least.

Jan


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