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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-03-17 16:37:17 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-24 23:57:31 +0200 |
| commit | e2a81baf6604a2e08e10c7405b0349106f77c8af (patch) | |
| tree | 3eaf386316be1f499d92fae213493ec3d6b5b576 /arch/x86/xen/smp.c | |
| parent | aa380c82b83252754a8c11bfc92359bd87cbf710 (diff) | |
| download | lwn-e2a81baf6604a2e08e10c7405b0349106f77c8af.tar.gz lwn-e2a81baf6604a2e08e10c7405b0349106f77c8af.zip | |
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>
Diffstat (limited to 'arch/x86/xen/smp.c')
| -rw-r--r-- | arch/x86/xen/smp.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index e340ff92f6b6..d61e4f8b07c7 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -72,6 +72,7 @@ static __cpuinit void cpu_bringup_and_idle(void) int cpu = smp_processor_id(); cpu_init(); + xen_enable_sysenter(); preempt_disable(); per_cpu(cpu_state, cpu) = CPU_ONLINE; |