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[Xen-devel] Bug in x86 instruction emulator?

I'm running Xen 4.6.1 with Alpine Linux 3.3.3 in dom0. In a HVM domU with vga="qxl", Xorg will segfault instantly if tried started. Multiple Linux distros have been tested and Xorg segfaults in all.

Attached are a full backtrace from domU generated by Xorg, and a assembler dump of function 'sse2_blt'.

According to Xen IRC channel, the cause could be a bug in the x86 instruction emulator related to SSE.

Attachment: xorg-full-backtrace.txt
Description: Text document

Attachment: sse2_blt-assembler-dump.txt
Description: Text document

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