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Subject: [Bug 202643] x11-servers/xorg-server: illegal instruction starting
 xorg in FreeBSD >10.x in kvm/qemu virtualization
Date: Sat, 05 Sep 2015 14:34:49 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202643

--- Comment #30 from commit-hook@freebsd.org ---
A commit references this bug:

Author: dim
Date: Sat Sep  5 14:34:19 UTC 2015
New revision: 396175
URL: https://svnweb.freebsd.org/changeset/ports/396175

Log:
  MFH: r396167

  Disable use of SSE instructions in Xorg's xf86SlowBcopy() function.

  When such instructions are used to copy data from/to mapped video
  memory, some hypervisors (e.g. KVM, Microsoft Hyper-V) can generate
  SIGILL or SIGBUS exceptions, causing Xorg to crash.

  Reported by:    nogcjx@fastmail.fm
  Approved by:    ports-secteam (feld)
  PR:        202643

Changes:
_U  branches/2015Q3/
  branches/2015Q3/x11-servers/xorg-server/Makefile
 
branches/2015Q3/x11-servers/xorg-server/files/patch-Xserver-hw-xfree86-os-support-misc-Makefile.in

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