2010-07-07 11:12:45 +00:00
|
|
|
From: Andrea Arcangeli <andrea@cpushare.com>
|
|
|
|
|
Subject: [PATCH seccomp: make tsc disabling optional
|
|
|
|
|
Patch-mainline: unknown
|
|
|
|
|
References: 191123
|
|
|
|
|
|
|
|
|
|
Make the TSC disable purely paranoid feature optional, so by default seccomp
|
|
|
|
|
returns absolutely zerocost.
|
|
|
|
|
|
|
|
|
|
Ported from 2.6.19 to 2.6.24-rc7 by Jeff Mahoney.
|
|
|
|
|
Addition of x86-64 by Jan Beulich.
|
|
|
|
|
|
|
|
|
|
Signed-off-by: Andrea Arcangeli <andrea@cpushare.com>
|
|
|
|
|
Acked-by: Jeff Mahoney <jeffm@suse.com>
|
|
|
|
|
Automatically created from "patches.fixes/seccomp-disable-tsc-option" by xen-port-patches.py
|
|
|
|
|
|
2011-04-19 20:09:59 +00:00
|
|
|
--- head-2011-02-17.orig/arch/x86/kernel/process-xen.c 2011-03-03 16:13:18.000000000 +0100
|
|
|
|
|
+++ head-2011-02-17/arch/x86/kernel/process-xen.c 2011-03-03 16:13:29.000000000 +0100
|
|
|
|
|
@@ -142,6 +142,7 @@ static void hard_disable_TSC(void)
|
2010-07-07 11:12:45 +00:00
|
|
|
|
|
|
|
|
void disable_TSC(void)
|
|
|
|
|
{
|
|
|
|
|
+#ifdef CONFIG_SECCOMP_DISABLE_TSC
|
|
|
|
|
preempt_disable();
|
|
|
|
|
if (!test_and_set_thread_flag(TIF_NOTSC))
|
|
|
|
|
/*
|
2011-04-19 20:09:59 +00:00
|
|
|
@@ -150,6 +151,7 @@ void disable_TSC(void)
|
2010-07-07 11:12:45 +00:00
|
|
|
*/
|
|
|
|
|
hard_disable_TSC();
|
|
|
|
|
preempt_enable();
|
|
|
|
|
+#endif
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void hard_enable_TSC(void)
|
