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xen: support sysenter/sysexit if hypervisor does
authorJeremy Fitzhardinge <jeremy@goop.org>
Mon, 17 Mar 2008 23:37:17 +0000 (16:37 -0700)
committerIngo Molnar <mingo@elte.hu>
Thu, 24 Apr 2008 21:57:31 +0000 (23:57 +0200)
commite2a81baf6604a2e08e10c7405b0349106f77c8af
tree3eaf386316be1f499d92fae213493ec3d6b5b576tree | snapshot
parentaa380c82b83252754a8c11bfc92359bd87cbf710commit | diff
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>
arch/x86/kernel/entry_32.S diff | blob | history
arch/x86/xen/enlighten.c diff | blob | history
arch/x86/xen/setup.c diff | blob | history
arch/x86/xen/smp.c diff | blob | history
arch/x86/xen/xen-asm.S diff | blob | history
arch/x86/xen/xen-ops.h diff | blob | history
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