tree 3bd503d3e7b9aa84c1ab618c53c1b1eadad87c83
parent 922cc38ab71d1360978e65207e4a4f4988987127
author Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> 1259183738 -0800
committer Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> 1259867694 -0800

xen: use iret for return from 64b kernel to 32b usermode

If Xen wants to return to a 32b usermode with sysret it must use the
right form.  When using VCGF_in_syscall to trigger this, it looks at
the code segment and does a 32b sysret if it is FLAT_USER_CS32.
However, this is different from __USER32_CS, so it fails to return
properly if we use the normal Linux segment.

So avoid the whole mess by dropping VCGF_in_syscall and simply use
plain iret to return to usermode.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Jan Beulich <jbeulich@novell.com>
Cc: Stable Kernel <stable@kernel.org>