tree 3eaf386316be1f499d92fae213493ec3d6b5b576
parent aa380c82b83252754a8c11bfc92359bd87cbf710
author Jeremy Fitzhardinge <jeremy@goop.org> 1205797037 -0700
committer Ingo Molnar <mingo@elte.hu> 1209074251 +0200

xen: support sysenter/sysexit if hypervisor does

64-bit Xen supports sysenter for 32-bit guests, so support its
use.  (sysenter is faster than int $0x80 in 32-on-64.)

sysexit is still not supported, so we fake it up using iret.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>