From: "Joel Fernandes (Google)" <joel@joelfernandes.org>
To: linux-kernel@vger.kernel.org
Cc: "Joel Fernandes (Google)" <joel@joelfernandes.org>,
Aaron Lu <aaron.lwe@gmail.com>,
Aubrey Li <aubrey.li@linux.intel.com>,
Julien Desfossez <jdesfossez@digitalocean.com>,
Kees Cook <keescook@chromium.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Paul Turner <pjt@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
Tim Chen <tim.c.chen@intel.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Vineeth Pillai <viremana@linux.microsoft.com>,
x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
fweisbec@gmail.com, kerrnel@google.com,
Phil Auld <pauld@redhat.com>,
Valentin Schneider <valentin.schneider@arm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Chen Yu <yu.c.chen@intel.com>,
Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH RFC 05/12] entry/idle: Enter and exit kernel protection during idle entry and exit
Date: Fri, 14 Aug 2020 23:19:01 -0400 [thread overview]
Message-ID: <20200815031908.1015049-6-joel@joelfernandes.org> (raw)
In-Reply-To: <20200815031908.1015049-1-joel@joelfernandes.org>
Make use of the generic_idle_{enter,exit} helper function added in
earlier patches to enter and exit kernel protection.
On exiting idle, protection will be reenabled.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
include/linux/entry-common.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/include/linux/entry-common.h b/include/linux/entry-common.h
index 2ea0e09b00d5..c833f2fda542 100644
--- a/include/linux/entry-common.h
+++ b/include/linux/entry-common.h
@@ -374,6 +374,9 @@ void noinstr irqentry_exit(struct pt_regs *regs, irqentry_state_t state);
*/
static inline void generic_idle_enter(void)
{
+ /* Entering idle ends the protected kernel region. */
+ sched_core_unsafe_exit();
+
rcu_idle_enter();
}
@@ -383,6 +386,9 @@ static inline void generic_idle_enter(void)
static inline void generic_idle_exit(void)
{
rcu_idle_exit();
+
+ /* Exiting idle (re)starts the protected kernel region. */
+ sched_core_unsafe_enter();
}
#endif
--
2.28.0.220.ged08abb693-goog
next prev parent reply other threads:[~2020-08-15 21:57 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-15 3:18 [PATCH RFC 00/12] Core-sched v6+: kernel protection and hotplug fixes Joel Fernandes (Google)
2020-08-15 3:18 ` [PATCH RFC 01/12] irq_work: Add support to detect if work is pending Joel Fernandes (Google)
2020-08-15 8:13 ` peterz
2020-08-17 2:04 ` Joel Fernandes
2020-08-15 3:18 ` [PATCH RFC 02/12] entry/idle: Add a common function for activites during idle entry/exit Joel Fernandes (Google)
2020-08-15 8:14 ` peterz
2020-08-17 2:17 ` Joel Fernandes
2020-08-15 3:18 ` [PATCH RFC 03/12] arch/x86: Add a new TIF flag for untrusted tasks Joel Fernandes (Google)
2020-08-15 3:19 ` [PATCH RFC 04/12] kernel/entry: Add support for core-wide protection of kernel-mode Joel Fernandes (Google)
2020-08-15 3:19 ` Joel Fernandes (Google) [this message]
2020-08-15 3:19 ` [PATCH RFC 06/12] entry/kvm: Protect the kernel when entering from guest Joel Fernandes (Google)
2020-08-15 3:19 ` [PATCH RFC 07/12] bitops: Introduce find_next_or_bit Joel Fernandes (Google)
2020-08-15 3:19 ` [PATCH RFC 08/12] cpumask: Introduce a new iterator for_each_cpu_wrap_or Joel Fernandes (Google)
2020-08-15 3:19 ` [PATCH RFC 09/12] sched/coresched: Use for_each_cpu(_wrap)_or for pick_next_task Joel Fernandes (Google)
2020-08-15 3:19 ` [PATCH RFC 10/12] sched/coresched: Make core_pick_seq per run-queue Joel Fernandes (Google)
2020-08-15 3:19 ` [PATCH RFC 11/12] sched/coresched: Check for dynamic changes in smt_mask Joel Fernandes (Google)
2020-08-15 3:19 ` [PATCH RFC 12/12] sched/coresched: rq->core should be set only if not previously set Joel Fernandes (Google)
2020-08-19 18:26 ` [PATCH RFC 00/12] Core-sched v6+: kernel protection and hotplug fixes Kees Cook
2020-08-20 1:44 ` Joel Fernandes
2020-08-22 20:22 ` Joel Fernandes
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