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charset="utf-8" With XEN preemption enabled, scheduler functions can be called with IRQs disabled (for example, at end of IRQ handler), so we should save and restore IRQ state in schedulers code. Signed-off-by: Volodymyr Babchuk --- xen/common/sched/core.c | 33 ++++++++++++++++++--------------- 1 file changed, 18 insertions(+), 15 deletions(-) diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c index 9745a77eee..7e075613d5 100644 --- a/xen/common/sched/core.c +++ b/xen/common/sched/core.c @@ -2470,7 +2470,8 @@ static struct vcpu *sched_force_context_switch(struct= vcpu *vprev, * sched_res_rculock has been dropped. */ static struct sched_unit *sched_wait_rendezvous_in(struct sched_unit *prev, - spinlock_t **lock, int = cpu, + spinlock_t **lock, + unsigned long *flags, i= nt cpu, s_time_t now) { struct sched_unit *next; @@ -2500,7 +2501,7 @@ static struct sched_unit *sched_wait_rendezvous_in(st= ruct sched_unit *prev, prev->rendezvous_in_cnt++; atomic_set(&prev->rendezvous_out_cnt, 0); =20 - pcpu_schedule_unlock_irq(*lock, cpu); + pcpu_schedule_unlock_irqrestore(*lock, *flags, cpu); =20 sched_context_switch(vprev, v, false, now); =20 @@ -2530,7 +2531,7 @@ static struct sched_unit *sched_wait_rendezvous_in(st= ruct sched_unit *prev, prev->rendezvous_in_cnt++; atomic_set(&prev->rendezvous_out_cnt, 0); =20 - pcpu_schedule_unlock_irq(*lock, cpu); + pcpu_schedule_unlock_irqrestore(*lock, *flags, cpu); =20 raise_softirq(SCHED_SLAVE_SOFTIRQ); sched_context_switch(vprev, vprev, false, now); @@ -2538,11 +2539,11 @@ static struct sched_unit *sched_wait_rendezvous_in(= struct sched_unit *prev, return NULL; /* ARM only. */ } =20 - pcpu_schedule_unlock_irq(*lock, cpu); + pcpu_schedule_unlock_irqrestore(*lock, *flags, cpu); =20 cpu_relax(); =20 - *lock =3D pcpu_schedule_lock_irq(cpu); + *lock =3D pcpu_schedule_lock_irqsave(cpu, flags); =20 /* * Check for scheduling resource switched. This happens when we are @@ -2557,7 +2558,7 @@ static struct sched_unit *sched_wait_rendezvous_in(st= ruct sched_unit *prev, ASSERT(is_idle_unit(prev)); atomic_set(&prev->next_task->rendezvous_out_cnt, 0); prev->rendezvous_in_cnt =3D 0; - pcpu_schedule_unlock_irq(*lock, cpu); + pcpu_schedule_unlock_irqrestore(*lock, *flags, cpu); rcu_read_unlock(&sched_res_rculock); return NULL; } @@ -2574,12 +2575,13 @@ static void sched_slave(void) spinlock_t *lock; bool do_softirq =3D false; unsigned int cpu =3D smp_processor_id(); + unsigned long flags; =20 ASSERT_NOT_IN_ATOMIC(); =20 rcu_read_lock(&sched_res_rculock); =20 - lock =3D pcpu_schedule_lock_irq(cpu); + lock =3D pcpu_schedule_lock_irqsave(cpu, &flags); =20 now =3D NOW(); =20 @@ -2590,7 +2592,7 @@ static void sched_slave(void) =20 if ( v ) { - pcpu_schedule_unlock_irq(lock, cpu); + pcpu_schedule_unlock_irqrestore(lock, flags, cpu); =20 sched_context_switch(vprev, v, false, now); =20 @@ -2602,7 +2604,7 @@ static void sched_slave(void) =20 if ( !prev->rendezvous_in_cnt ) { - pcpu_schedule_unlock_irq(lock, cpu); + pcpu_schedule_unlock_irqrestore(lock, flags, cpu); =20 rcu_read_unlock(&sched_res_rculock); =20 @@ -2615,11 +2617,11 @@ static void sched_slave(void) =20 stop_timer(&get_sched_res(cpu)->s_timer); =20 - next =3D sched_wait_rendezvous_in(prev, &lock, cpu, now); + next =3D sched_wait_rendezvous_in(prev, &lock, &flags, cpu, now); if ( !next ) return; =20 - pcpu_schedule_unlock_irq(lock, cpu); + pcpu_schedule_unlock_irqrestore(lock, flags, cpu); =20 sched_context_switch(vprev, sched_unit2vcpu_cpu(next, cpu), is_idle_unit(next) && !is_idle_unit(prev), now); @@ -2637,6 +2639,7 @@ static void schedule(void) s_time_t now; struct sched_resource *sr; spinlock_t *lock; + unsigned long flags; int cpu =3D smp_processor_id(); unsigned int gran; =20 @@ -2646,7 +2649,7 @@ static void schedule(void) =20 rcu_read_lock(&sched_res_rculock); =20 - lock =3D pcpu_schedule_lock_irq(cpu); + lock =3D pcpu_schedule_lock_irqsave(cpu, &flags); =20 sr =3D get_sched_res(cpu); gran =3D sr->granularity; @@ -2657,7 +2660,7 @@ static void schedule(void) * We have a race: sched_slave() should be called, so raise a soft= irq * in order to re-enter schedule() later and call sched_slave() no= w. */ - pcpu_schedule_unlock_irq(lock, cpu); + pcpu_schedule_unlock_irqrestore(lock, flags, cpu); =20 rcu_read_unlock(&sched_res_rculock); =20 @@ -2676,7 +2679,7 @@ static void schedule(void) prev->rendezvous_in_cnt =3D gran; cpumask_andnot(mask, sr->cpus, cpumask_of(cpu)); cpumask_raise_softirq(mask, SCHED_SLAVE_SOFTIRQ); - next =3D sched_wait_rendezvous_in(prev, &lock, cpu, now); + next =3D sched_wait_rendezvous_in(prev, &lock, &flags, cpu, now); if ( !next ) return; } @@ -2687,7 +2690,7 @@ static void schedule(void) atomic_set(&next->rendezvous_out_cnt, 0); } =20 - pcpu_schedule_unlock_irq(lock, cpu); + pcpu_schedule_unlock_irqrestore(lock, flags, cpu); =20 vnext =3D sched_unit2vcpu_cpu(next, cpu); sched_context_switch(vprev, vnext, --=20 2.29.2 From nobody Wed May 1 16:49:23 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; 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charset="utf-8" With XEN preemption enabled, scheduler functions can be called with IRQs disabled (for example, at end of IRQ handler), so we should save and restore IRQ state in schedulers code. Signed-off-by: Volodymyr Babchuk --- xen/common/sched/rt.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/xen/common/sched/rt.c b/xen/common/sched/rt.c index c24cd2ac32..e1711a8edc 100644 --- a/xen/common/sched/rt.c +++ b/xen/common/sched/rt.c @@ -1318,7 +1318,8 @@ static void rt_context_saved(const struct scheduler *ops, struct sched_unit *unit) { struct rt_unit *svc =3D rt_unit(unit); - spinlock_t *lock =3D unit_schedule_lock_irq(unit); + unsigned long flags; + spinlock_t *lock =3D unit_schedule_lock_irqsave(unit, &flags); =20 __clear_bit(__RTDS_scheduled, &svc->flags); /* not insert idle unit to runq */ @@ -1335,7 +1336,7 @@ rt_context_saved(const struct scheduler *ops, struct = sched_unit *unit) replq_remove(ops, svc); =20 out: - unit_schedule_unlock_irq(lock, unit); + unit_schedule_unlock_irqrestore(lock, flags, unit); } =20 /* @@ -1460,9 +1461,10 @@ static void repl_timer_handler(void *data){ struct list_head *runq =3D rt_runq(ops); struct list_head *iter, *tmp; struct rt_unit *svc; + unsigned long flags; LIST_HEAD(tmp_replq); =20 - spin_lock_irq(&prv->lock); + spin_lock_irqsave(&prv->lock, flags); =20 now =3D NOW(); =20 @@ -1525,7 +1527,7 @@ static void repl_timer_handler(void *data){ if ( !list_empty(replq) ) set_timer(&prv->repl_timer, replq_elem(replq->next)->cur_deadline); =20 - spin_unlock_irq(&prv->lock); + spin_unlock_irqrestore(&prv->lock, flags); } =20 static const struct scheduler sched_rtds_def =3D { --=20 2.29.2 From nobody Wed May 1 16:49:23 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; arc=pass (i=1dmarc=pass fromdomain=epam.com); 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charset="utf-8" With XEN preemption enabled, scheduler functions can be called with IRQs disabled (for example, at end of IRQ handler), so we should save and restore IRQ state in schedulers code. Signed-off-by: Volodymyr Babchuk --- xen/common/sched/credit2.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/xen/common/sched/credit2.c b/xen/common/sched/credit2.c index eb5e5a78c5..b3a9786425 100644 --- a/xen/common/sched/credit2.c +++ b/xen/common/sched/credit2.c @@ -2297,7 +2297,8 @@ static void csched2_context_saved(const struct scheduler *ops, struct sched_unit *unit) { struct csched2_unit * const svc =3D csched2_unit(unit); - spinlock_t *lock =3D unit_schedule_lock_irq(unit); + unsigned long flags; + spinlock_t *lock =3D unit_schedule_lock_irqsave(unit, &flags); s_time_t now =3D NOW(); LIST_HEAD(were_parked); =20 @@ -2329,7 +2330,7 @@ csched2_context_saved(const struct scheduler *ops, st= ruct sched_unit *unit) else if ( !is_idle_unit(unit) ) update_load(ops, svc->rqd, svc, -1, now); =20 - unit_schedule_unlock_irq(lock, unit); + unit_schedule_unlock_irqrestore(lock, flags, unit); =20 unpark_parked_units(ops, &were_parked); } --=20 2.29.2 From nobody Wed May 1 16:49:23 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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charset="utf-8" This ensures that preempt_count will be accounted correctly during in-hypevisor context switches. Signed-off-by: Volodymyr Babchuk --- xen/common/preempt.c | 6 +++--- xen/include/xen/preempt.h | 9 ++++----- 2 files changed, 7 insertions(+), 8 deletions(-) diff --git a/xen/common/preempt.c b/xen/common/preempt.c index 3b4178fd44..ad61c8419a 100644 --- a/xen/common/preempt.c +++ b/xen/common/preempt.c @@ -23,17 +23,17 @@ #include #include =20 -DEFINE_PER_CPU(unsigned int, __preempt_count); +DEFINE_PER_CPU(atomic_t, __preempt_count); =20 bool_t in_atomic(void) { - return preempt_count() || in_irq() || !local_irq_is_enabled(); + return atomic_read(&preempt_count()) || in_irq() || local_irq_is_enabl= ed(); } =20 #ifndef NDEBUG void ASSERT_NOT_IN_ATOMIC(void) { - ASSERT(!preempt_count()); + ASSERT(!atomic_read(&preempt_count())); ASSERT(!in_irq()); ASSERT(local_irq_is_enabled()); } diff --git a/xen/include/xen/preempt.h b/xen/include/xen/preempt.h index bef83135a1..e217900d6e 100644 --- a/xen/include/xen/preempt.h +++ b/xen/include/xen/preempt.h @@ -9,21 +9,20 @@ #ifndef __XEN_PREEMPT_H__ #define __XEN_PREEMPT_H__ =20 +#include #include #include =20 -DECLARE_PER_CPU(unsigned int, __preempt_count); +DECLARE_PER_CPU(atomic_t, __preempt_count); =20 #define preempt_count() (this_cpu(__preempt_count)) =20 #define preempt_disable() do { \ - preempt_count()++; \ - barrier(); \ + atomic_inc(&preempt_count()); \ } while (0) =20 #define preempt_enable() do { \ - barrier(); \ - preempt_count()--; \ + atomic_dec(&preempt_count()); \ } while (0) =20 bool_t in_atomic(void); --=20 2.29.2 From nobody Wed May 1 16:49:23 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; arc=pass (i=1dmarc=pass fromdomain=epam.com); dmarc=pass(p=quarantine dis=none) header.from=epam.com ARC-Seal: i=2; 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charset="utf-8" This function can be used to preempt code running in hypervisor mode. Generally, there are two reasons to preempt while in HYP mode: 1. IRQ arrived. This may woke vCPU with higher scheduling priority. 2. Exit from atomic context. While we were in atomic context, state of the system may changed and we need to reschedule. It is very inefficient to call scheduler each time we leave atomic context, so very simple optimists is used. There are cases when we *know* that there might be reasons for preemption. One example - is IRQ. In this case we call try_preempt(true). This will force rescheduling if we are outside atomic context or it will ensure that scheduler will be called right after leaving atomic context. This is done by calling try_preempt(false) when we are leaving atomic context. try_preempt(false) will check if there was call to try_preempt(true) in atomic context and call scheduler only in this case. Also macro preempt_enable_no_sched() is introduced. It is meant to be used by scheduler itself, because we don't want to initiate rescheduling inside scheduler code. Signed-off-by: Volodymyr Babchuk --- xen/common/preempt.c | 32 +++++++++++++++++++++++++++++++- xen/include/xen/preempt.h | 8 ++++++++ 2 files changed, 39 insertions(+), 1 deletion(-) diff --git a/xen/common/preempt.c b/xen/common/preempt.c index ad61c8419a..98699aaa1f 100644 --- a/xen/common/preempt.c +++ b/xen/common/preempt.c @@ -4,6 +4,7 @@ * Track atomic regions in the hypervisor which disallow sleeping. *=20 * Copyright (c) 2010, Keir Fraser + * Copyright (c) 2021, EPAM Systems *=20 * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -21,13 +22,42 @@ =20 #include #include +#include +#include #include =20 DEFINE_PER_CPU(atomic_t, __preempt_count); +DEFINE_PER_CPU(unsigned int, need_reschedule); =20 bool_t in_atomic(void) { - return atomic_read(&preempt_count()) || in_irq() || local_irq_is_enabl= ed(); + return atomic_read(&preempt_count()) || in_irq(); +} + +void try_preempt(bool force) +{ + /* + * If caller wants us to call the scheduler, but we are in atomic + * context - update the flag. We will try preemption upon exit + * from atomic context. + */ + if ( force && in_atomic() ) + { + this_cpu(need_reschedule) =3D 1; + return; + } + + /* idle vCPU schedules via soft IRQs */ + if ( unlikely(system_state !=3D SYS_STATE_active) || + in_atomic() || + is_idle_vcpu(current) ) + return; + + if ( force || this_cpu(need_reschedule) ) + { + this_cpu(need_reschedule) =3D 0; + wait(); + } } =20 #ifndef NDEBUG diff --git a/xen/include/xen/preempt.h b/xen/include/xen/preempt.h index e217900d6e..df7352a75e 100644 --- a/xen/include/xen/preempt.h +++ b/xen/include/xen/preempt.h @@ -4,6 +4,7 @@ * Track atomic regions in the hypervisor which disallow sleeping. *=20 * Copyright (c) 2010, Keir Fraser + * Copyright (c) 2021, EPAM Systems */ =20 #ifndef __XEN_PREEMPT_H__ @@ -15,6 +16,8 @@ =20 DECLARE_PER_CPU(atomic_t, __preempt_count); =20 +void try_preempt(bool force); + #define preempt_count() (this_cpu(__preempt_count)) =20 #define preempt_disable() do { \ @@ -23,6 +26,11 @@ DECLARE_PER_CPU(atomic_t, __preempt_count); 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charset="utf-8" In the subsequent patches we will enable preemption in the hypervisor mode. But we don't want any preemption attempts while system is still not ready to call scheduler. So we should disable preemption during early boot stages and enable it only when we switched to idle vCPU stack. Signed-off-by: Volodymyr Babchuk --- xen/arch/arm/setup.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index 2532ec9739..15a618b87c 100644 --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -78,6 +78,9 @@ static __used void init_done(void) unregister_init_virtual_region(); =20 free_init_memory(); + + preempt_enable(); + startup_cpu_idle_loop(); } =20 @@ -920,6 +923,7 @@ void __init start_xen(unsigned long boot_phys_offset, =20 setup_system_domains(); =20 + preempt_disable(); local_irq_enable(); local_abort_enable(); =20 --=20 2.29.2 From nobody Wed May 1 16:49:23 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; 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charset="utf-8" ASSERT_NOT_IN_ATOMIC() is very strict, because it checks that local IRQs are disabled. But there is a case when this is okay: when we finished handling IRQ in hypervisor mode we might want to preempt current vCPU. In this case scheduler will be called with local IRQs disabled. On other hand, we want to ensure that scheduler code is not preempted itself. So we need to disable preemption while doing scheduling. WARNING! This patch works only for ARM code, because ARM code returns after call to sched_context_switch() and it is able to enable preemption back. In case of x86 further investigation required. Signed-off-by: Volodymyr Babchuk --- xen/arch/arm/domain.c | 3 +++ xen/common/sched/core.c | 13 ++++++++++--- 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c index bdd3d3e5b5..2ccf4449ea 100644 --- a/xen/arch/arm/domain.c +++ b/xen/arch/arm/domain.c @@ -335,6 +335,9 @@ static void continue_new_vcpu(struct vcpu *prev) =20 schedule_tail(prev); =20 + /* This matches preempt_disable() in schedule() */ + preempt_enable_no_sched(); + if ( is_idle_vcpu(current) ) reset_stack_and_jump(idle_loop); else if ( is_32bit_domain(current->domain) ) diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c index 7e075613d5..057b558367 100644 --- a/xen/common/sched/core.c +++ b/xen/common/sched/core.c @@ -2577,8 +2577,6 @@ static void sched_slave(void) unsigned int cpu =3D smp_processor_id(); unsigned long flags; =20 - ASSERT_NOT_IN_ATOMIC(); - rcu_read_lock(&sched_res_rculock); =20 lock =3D pcpu_schedule_lock_irqsave(cpu, &flags); @@ -2643,7 +2641,7 @@ static void schedule(void) int cpu =3D smp_processor_id(); unsigned int gran; =20 - ASSERT_NOT_IN_ATOMIC(); + preempt_disable(); =20 SCHED_STAT_CRANK(sched_run); =20 @@ -2665,6 +2663,9 @@ static void schedule(void) rcu_read_unlock(&sched_res_rculock); =20 raise_softirq(SCHEDULE_SOFTIRQ); + + preempt_enable_no_sched(); + return sched_slave(); } =20 @@ -2681,7 +2682,10 @@ static void schedule(void) cpumask_raise_softirq(mask, SCHED_SLAVE_SOFTIRQ); next =3D sched_wait_rendezvous_in(prev, &lock, &flags, cpu, now); if ( !next ) + { + preempt_enable_no_sched(); return; + } } else { @@ -2695,6 +2699,9 @@ static void schedule(void) vnext =3D sched_unit2vcpu_cpu(next, cpu); sched_context_switch(vprev, vnext, !is_idle_unit(prev) && is_idle_unit(next), now); + + /* XXX: Move me */ + preempt_enable_no_sched(); } =20 /* The scheduler timer: force a run through the scheduler */ --=20 2.29.2 From nobody Wed May 1 16:49:23 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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charset="utf-8" With upcoming full hypervisor preemption it is possible that context switching code will be called with IRQs already disabled. In this case we don't want to enable them back. So we need to add logic that tracks if IRQs are already disabled. Signed-off-by: Volodymyr Babchuk --- xen/arch/arm/domain.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c index 2ccf4449ea..3d4a1df4a4 100644 --- a/xen/arch/arm/domain.c +++ b/xen/arch/arm/domain.c @@ -310,7 +310,7 @@ static void update_runstate_area(struct vcpu *v) } } =20 -static void schedule_tail(struct vcpu *prev) +static void schedule_tail(struct vcpu *prev, bool enable_irqs) { ASSERT(prev !=3D current); =20 @@ -318,7 +318,8 @@ static void schedule_tail(struct vcpu *prev) =20 ctxt_switch_to(current); =20 - local_irq_enable(); + if (enable_irqs) + local_irq_enable(); =20 sched_context_switched(prev, current); =20 @@ -333,7 +334,7 @@ static void continue_new_vcpu(struct vcpu *prev) current->arch.actlr =3D READ_SYSREG32(ACTLR_EL1); processor_vcpu_initialise(current); =20 - schedule_tail(prev); + schedule_tail(prev, true); =20 /* This matches preempt_disable() in schedule() */ preempt_enable_no_sched(); @@ -350,19 +351,21 @@ static void continue_new_vcpu(struct vcpu *prev) =20 void context_switch(struct vcpu *prev, struct vcpu *next) { - ASSERT(local_irq_is_enabled()); + bool need_to_disable_irqs =3D local_irq_is_enabled(); + ASSERT(prev !=3D next); ASSERT(!vcpu_cpu_dirty(next)); =20 update_runstate_area(prev); =20 - local_irq_disable(); + if (need_to_disable_irqs) + local_irq_disable(); =20 set_current(next); =20 prev =3D __context_switch(prev, next); =20 - schedule_tail(prev); + schedule_tail(prev, need_to_disable_irqs); } =20 void continue_running(struct vcpu *same) --=20 2.29.2 From nobody Wed May 1 16:49:23 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; 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charset="utf-8" Now we can try to preempt code that is running in hypervisor code. To do so we need to try to invoke scheduler by calling try_preempt(), while not in nested IRQ handler. Signed-off-by: Volodymyr Babchuk --- xen/arch/arm/traps.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c index 6fa135050b..98a4fb4904 100644 --- a/xen/arch/arm/traps.c +++ b/xen/arch/arm/traps.c @@ -2260,7 +2260,14 @@ void do_trap_guest_serror(struct cpu_user_regs *regs) =20 void do_trap_irq(struct cpu_user_regs *regs) { + static DEFINE_PER_CPU(unsigned int, irq_entry_cnt); + + this_cpu(irq_entry_cnt)++; gic_interrupt(regs, 0); + this_cpu(irq_entry_cnt)--; + + if (this_cpu(irq_entry_cnt) =3D=3D 0) + try_preempt(true); } =20 void do_trap_fiq(struct cpu_user_regs *regs) --=20 2.29.2 From nobody Wed May 1 16:49:23 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; 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charset="utf-8" This code moves spin_unlock() and rcu_unlock_domain() earlier in the code just to decrease time we spent with preemption disabled. Proper fix is to replace spinlocks with mutexes, but mutexes are not implemented yet. With this patch enabled, allocation huge number of pages (e.g. 1GB of RAM) does not leads to problems with latency in time-critical domains. Signed-off-by: Volodymyr Babchuk --- xen/common/memory.c | 4 ++-- xen/common/page_alloc.c | 21 ++------------------- 2 files changed, 4 insertions(+), 21 deletions(-) diff --git a/xen/common/memory.c b/xen/common/memory.c index 76b9f58478..73c175f64e 100644 --- a/xen/common/memory.c +++ b/xen/common/memory.c @@ -1390,6 +1390,8 @@ long do_memory_op(unsigned long cmd, XEN_GUEST_HANDLE= _PARAM(void) arg) pv_shim_online_memory(args.nr_extents, args.extent_order); #endif =20 + rcu_unlock_domain(d); + switch ( op ) { case XENMEM_increase_reservation: @@ -1403,8 +1405,6 @@ long do_memory_op(unsigned long cmd, XEN_GUEST_HANDLE= _PARAM(void) arg) break; } =20 - rcu_unlock_domain(d); - rc =3D args.nr_done; =20 if ( args.preempted ) diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index 1744e6faa5..43c2f5d6e0 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -996,6 +996,8 @@ static struct page_info *alloc_heap_pages( if ( d !=3D NULL ) d->last_alloc_node =3D node; =20 + spin_unlock(&heap_lock); + for ( i =3D 0; i < (1 << order); i++ ) { /* Reference count must continuously be zero for free pages. */ @@ -1025,8 +1027,6 @@ static struct page_info *alloc_heap_pages( =20 } =20 - spin_unlock(&heap_lock); - if ( first_dirty !=3D INVALID_DIRTY_IDX || (scrub_debug && !(memflags & MEMF_no_scrub)) ) { @@ -2274,23 +2274,6 @@ int assign_pages( goto out; } =20 -#ifndef NDEBUG - { - unsigned int extra_pages =3D 0; - - for ( i =3D 0; i < (1ul << order); i++ ) - { - ASSERT(!(pg[i].count_info & ~PGC_extra)); - if ( pg[i].count_info & PGC_extra ) - extra_pages++; - } - - ASSERT(!extra_pages || - ((memflags & MEMF_no_refcount) && - extra_pages =3D=3D 1u << order)); - } -#endif - if ( pg[0].count_info & PGC_extra ) { d->extra_pages +=3D 1u << order; --=20 2.29.2