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authorFrederic Weisbecker <frederic@kernel.org>2021-02-01 02:05:48 +0300
committerIngo Molnar <mingo@kernel.org>2021-02-17 16:12:43 +0300
commit4ae7dc97f726ea95c58ac58af71cc034ad22d7de (patch)
treeebd8b482fb64fbe9adc8767532909487eb311f29 /kernel/rcu
parent47b8ff194c1fd73d58dc339b597d466fe48c8958 (diff)
downloadlinux-4ae7dc97f726ea95c58ac58af71cc034ad22d7de.tar.xz
entry/kvm: Explicitly flush pending rcuog wakeup before last rescheduling point
Following the idle loop model, cleanly check for pending rcuog wakeup before the last rescheduling point upon resuming to guest mode. This way we can avoid to do it from rcu_user_enter() with the last resort self-IPI hack that enforces rescheduling. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20210131230548.32970-6-frederic@kernel.org
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c44
-rw-r--r--kernel/rcu/tree_plugin.h1
2 files changed, 35 insertions, 10 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 2ebc211fffcb..ce17b8477442 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -678,9 +678,10 @@ EXPORT_SYMBOL_GPL(rcu_idle_enter);
#ifdef CONFIG_NO_HZ_FULL
+#if !defined(CONFIG_GENERIC_ENTRY) || !defined(CONFIG_KVM_XFER_TO_GUEST_WORK)
/*
* An empty function that will trigger a reschedule on
- * IRQ tail once IRQs get re-enabled on userspace resume.
+ * IRQ tail once IRQs get re-enabled on userspace/guest resume.
*/
static void late_wakeup_func(struct irq_work *work)
{
@@ -689,6 +690,37 @@ static void late_wakeup_func(struct irq_work *work)
static DEFINE_PER_CPU(struct irq_work, late_wakeup_work) =
IRQ_WORK_INIT(late_wakeup_func);
+/*
+ * If either:
+ *
+ * 1) the task is about to enter in guest mode and $ARCH doesn't support KVM generic work
+ * 2) the task is about to enter in user mode and $ARCH doesn't support generic entry.
+ *
+ * In these cases the late RCU wake ups aren't supported in the resched loops and our
+ * last resort is to fire a local irq_work that will trigger a reschedule once IRQs
+ * get re-enabled again.
+ */
+noinstr static void rcu_irq_work_resched(void)
+{
+ struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
+
+ if (IS_ENABLED(CONFIG_GENERIC_ENTRY) && !(current->flags & PF_VCPU))
+ return;
+
+ if (IS_ENABLED(CONFIG_KVM_XFER_TO_GUEST_WORK) && (current->flags & PF_VCPU))
+ return;
+
+ instrumentation_begin();
+ if (do_nocb_deferred_wakeup(rdp) && need_resched()) {
+ irq_work_queue(this_cpu_ptr(&late_wakeup_work));
+ }
+ instrumentation_end();
+}
+
+#else
+static inline void rcu_irq_work_resched(void) { }
+#endif
+
/**
* rcu_user_enter - inform RCU that we are resuming userspace.
*
@@ -702,8 +734,6 @@ static DEFINE_PER_CPU(struct irq_work, late_wakeup_work) =
*/
noinstr void rcu_user_enter(void)
{
- struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
-
lockdep_assert_irqs_disabled();
/*
@@ -711,13 +741,7 @@ noinstr void rcu_user_enter(void)
* rescheduling opportunity in the entry code. Trigger a self IPI
* that will fire and reschedule once we resume in user/guest mode.
*/
- instrumentation_begin();
- if (!IS_ENABLED(CONFIG_GENERIC_ENTRY) || (current->flags & PF_VCPU)) {
- if (do_nocb_deferred_wakeup(rdp) && need_resched())
- irq_work_queue(this_cpu_ptr(&late_wakeup_work));
- }
- instrumentation_end();
-
+ rcu_irq_work_resched();
rcu_eqs_enter(true);
}
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 384856e4d13e..cdc1b7651c03 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2197,6 +2197,7 @@ void rcu_nocb_flush_deferred_wakeup(void)
{
do_nocb_deferred_wakeup(this_cpu_ptr(&rcu_data));
}
+EXPORT_SYMBOL_GPL(rcu_nocb_flush_deferred_wakeup);
void __init rcu_init_nohz(void)
{