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Re: [Xen-users] XEN bug at traps.c:3271

OK, well, that is unfortunate.

I suppose you will announce new versions of Xen on the xen-users mailing list, or is there another channel where you would communicate a solution for this issue?


Am 20.01.2014 12:42, schrieb Jan Beulich:
On 20.01.14 at 11:15, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
On Sun, 2014-01-19 at 13:37 +0100, Martin Unzner wrote:
Hi list,

I just installed Xen 4.3.1 for EFI according to
https://bbs.archlinux.org/viewtopic.php?pid=1359933 and tried to boot
it. There was a crash at the very beginning, notifying me of a bug at
traps.c:3271. I could not find any logs, so I just noted the stack trace
on a sheet of paper:


Does that mean my hardware is incompatible?
No, just that you've found a bug I think.

I'm copying the devel list here to see if anyone has any clues.
We've seen that before: You unfortunately have got one of those
UEFI implementations that utilize XMM (or, unlikely, FPU) registers,
and Xen doesn't allow this. Which is a consequence of the UEFI
specification being imprecise here: Some firmware implementors
read it to allow such, while my reading of it results in this not being
allowed. This is currently being brought up with the USWG for a
resolution. I'm afraid there's nothing you can do to work around
this for the time being (short of not booting via xen.efi, which -
depending on how you do it and depending on your firmware -
may have other bad side effects).


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