From: tip-bot for Thomas Gleixner <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: mingo@kernel.org, peterz@infradead.org, pbonzini@redhat.com,
linux-kernel@vger.kernel.org, rkrcmar@redhat.com, hpa@zytor.com,
gleb@kernel.org, tglx@linutronix.de,
torvalds@linux-foundation.org, bigeasy@linutronix.de,
anna-maria@linutronix.de
Subject: [tip:smp/hotplug] virt: Convert kvm hotplug to state machine
Date: Tue, 19 Jul 2016 00:16:48 -0700 [thread overview]
Message-ID: <tip-8c18b2d2d0881b116ea52498c6d624c0a71e1fdc@git.kernel.org> (raw)
In-Reply-To: <20160713153335.886159080@linutronix.de>
Commit-ID: 8c18b2d2d0881b116ea52498c6d624c0a71e1fdc
Gitweb: http://git.kernel.org/tip/8c18b2d2d0881b116ea52498c6d624c0a71e1fdc
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 13 Jul 2016 17:16:37 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 15 Jul 2016 10:40:23 +0200
virt: Convert kvm hotplug to state machine
Install the callbacks via the state machine. The core won't invoke the
callbacks on already online CPUs.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krcmar <rkrcmar@redhat.com>
Cc: kvm@vger.kernel.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153335.886159080@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
include/linux/cpuhotplug.h | 1 +
virt/kvm/kvm_main.c | 32 ++++++++------------------------
2 files changed, 9 insertions(+), 24 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index a5b6a65..5423997 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -36,6 +36,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_XTENSA_STARTING,
CPUHP_AP_ARM_VFP_STARTING,
CPUHP_AP_PERF_ARM_STARTING,
+ CPUHP_AP_KVM_STARTING,
CPUHP_AP_NOTIFY_STARTING,
CPUHP_AP_ONLINE,
CPUHP_TEARDOWN_CPU,
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 48bd520..c1d6cf5 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3144,12 +3144,13 @@ static void hardware_enable_nolock(void *junk)
}
}
-static void hardware_enable(void)
+static int kvm_starting_cpu(unsigned int cpu)
{
raw_spin_lock(&kvm_count_lock);
if (kvm_usage_count)
hardware_enable_nolock(NULL);
raw_spin_unlock(&kvm_count_lock);
+ return 0;
}
static void hardware_disable_nolock(void *junk)
@@ -3162,12 +3163,13 @@ static void hardware_disable_nolock(void *junk)
kvm_arch_hardware_disable();
}
-static void hardware_disable(void)
+static int kvm_dying_cpu(unsigned int cpu)
{
raw_spin_lock(&kvm_count_lock);
if (kvm_usage_count)
hardware_disable_nolock(NULL);
raw_spin_unlock(&kvm_count_lock);
+ return 0;
}
static void hardware_disable_all_nolock(void)
@@ -3208,21 +3210,6 @@ static int hardware_enable_all(void)
return r;
}
-static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
- void *v)
-{
- val &= ~CPU_TASKS_FROZEN;
- switch (val) {
- case CPU_DYING:
- hardware_disable();
- break;
- case CPU_STARTING:
- hardware_enable();
- break;
- }
- return NOTIFY_OK;
-}
-
static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
void *v)
{
@@ -3489,10 +3476,6 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
return r;
}
-static struct notifier_block kvm_cpu_notifier = {
- .notifier_call = kvm_cpu_hotplug,
-};
-
static int kvm_debugfs_open(struct inode *inode, struct file *file,
int (*get)(void *, u64 *), int (*set)(void *, u64),
const char *fmt)
@@ -3743,7 +3726,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
goto out_free_1;
}
- r = register_cpu_notifier(&kvm_cpu_notifier);
+ r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "AP_KVM_STARTING",
+ kvm_starting_cpu, kvm_dying_cpu);
if (r)
goto out_free_2;
register_reboot_notifier(&kvm_reboot_notifier);
@@ -3797,7 +3781,7 @@ out_free:
kmem_cache_destroy(kvm_vcpu_cache);
out_free_3:
unregister_reboot_notifier(&kvm_reboot_notifier);
- unregister_cpu_notifier(&kvm_cpu_notifier);
+ cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
out_free_2:
out_free_1:
kvm_arch_hardware_unsetup();
@@ -3820,7 +3804,7 @@ void kvm_exit(void)
kvm_async_pf_deinit();
unregister_syscore_ops(&kvm_syscore_ops);
unregister_reboot_notifier(&kvm_reboot_notifier);
- unregister_cpu_notifier(&kvm_cpu_notifier);
+ cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
on_each_cpu(hardware_disable_nolock, NULL, 1);
kvm_arch_hardware_unsetup();
kvm_arch_exit();
next prev parent reply other threads:[~2016-07-19 7:17 UTC|newest]
Thread overview: 170+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-13 17:16 [patch V2 00/67] cpuhotplug: Convert all priority notifiers to the state machine Anna-Maria Gleixner
2016-07-13 17:16 ` [patch V2 02/67] x86/vdso: Convert to hotplug " Anna-Maria Gleixner
2016-07-19 6:58 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 01/67] cpuhotplug: Handle early registration gracefully Anna-Maria Gleixner
2016-07-19 6:57 ` [tip:smp/hotplug] cpu/hotplug: " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 03/67] irqchip/gic: Convert to hotplug state machine Anna-Maria Gleixner
2016-07-19 6:58 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 04/67] irqchip/gicv3: " Anna-Maria Gleixner
2016-07-19 6:59 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 05/67] irqchip/hip04: " Anna-Maria Gleixner
2016-07-19 6:59 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 07/67] irqchip/bcm2836: " Anna-Maria Gleixner
2016-07-19 7:00 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 06/67] irqchip/armada-370-xp: " Anna-Maria Gleixner
2016-07-19 7:00 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 08/67] ARM: mvebu: " Anna-Maria Gleixner
2016-07-19 7:01 ` [tip:smp/hotplug] ARM/mvebu: " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 09/67] perf/core: " Anna-Maria Gleixner
2016-07-19 7:01 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 10/67] perf/x86: Convert the core to the " Anna-Maria Gleixner
2016-07-19 7:02 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 11/67] perf/x86/intel/uncore: Convert to " Anna-Maria Gleixner
2016-07-19 7:02 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 12/67] perf/x86/amd/uncore: " Anna-Maria Gleixner
2016-07-19 7:03 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 13/67] perf/x86/amd/ibs: " Anna-Maria Gleixner
2016-07-19 7:03 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 14/67] perf/x86/intel/rapl: " Anna-Maria Gleixner
2016-07-19 7:04 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 15/67] perf/x86/intel/cqm: Convert Intel CQM " Anna-Maria Gleixner
2016-07-19 7:04 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 16/67] perf/x86/intel/cstate: Convert Intel CSTATE " Anna-Maria Gleixner
2016-07-19 7:05 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 17/67] blackfin/perf: Convert hotplug notifier to " Anna-Maria Gleixner
2016-07-19 7:05 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 18/67] powerpc/perf: Convert book3s notifier to state machine callbacks Anna-Maria Gleixner
2016-07-19 7:06 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 19/67] s390/perf: Convert the hotplug notifier to state machine callbacks (Counter) Anna-Maria Gleixner
2016-07-19 7:07 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 20/67] s390/perf: Convert the hotplug notifier to state machine callbacks (Sampling) Anna-Maria Gleixner
2016-07-19 7:07 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 21/67] sh/perf: Convert the hotplug notifiers to state machine callbacks Anna-Maria Gleixner
2016-07-19 7:07 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 22/67] bus/arm-cci: Convert to hotplug statemachine Anna-Maria Gleixner
2016-07-15 12:38 ` Punit Agrawal
2016-07-19 7:08 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 23/67] bus/arm-ccn: " Anna-Maria Gleixner
2016-07-18 18:37 ` Pawel Moll
2016-07-19 7:09 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 24/67] xtensa/perf: Convert the hotplug notifier to state machine callbacks Anna-Maria Gleixner
2016-07-19 7:09 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 25/67] perf/x86/amd/power: Change hotplug notifier to a symmetric structure Anna-Maria Gleixner
2016-07-19 7:10 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-07-13 17:16 ` [patch V2 26/67] perf/x86/amd/power: Convert the hotplug notifier to state machine Anna-Maria Gleixner
2016-07-19 7:11 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-07-13 17:16 ` [patch V2 27/67] perf/core: Remove perf CPU notifier code Anna-Maria Gleixner
2016-07-19 7:11 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 28/67] workqueue: Convert to state machine callbacks Anna-Maria Gleixner
2016-07-19 7:12 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 29/67] x86/hpet: Convert to hotplug state machine Anna-Maria Gleixner
2016-07-19 7:13 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 30/67] powerpc/numa: " Anna-Maria Gleixner
2016-07-14 21:42 ` Anton Blanchard
2016-07-14 23:37 ` Anna-Maria Gleixner
2016-07-15 0:28 ` Anton Blanchard
2016-07-15 8:43 ` Ingo Molnar
2016-07-15 12:14 ` Anton Blanchard
2016-07-15 16:20 ` Sebastian Andrzej Siewior
2016-07-18 14:07 ` [PATCH v2] " Sebastian Andrzej Siewior
2016-07-22 19:57 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 31/67] KVM/x86: Remove superfluous SMP function call Anna-Maria Gleixner
2016-07-14 8:21 ` Paolo Bonzini
2016-07-19 7:13 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-07-13 17:16 ` [patch V2 32/67] x86/kvm/kvmclock: Convert to hotplug state machine Anna-Maria Gleixner
2016-07-19 7:14 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 33/67] x86/apb_timer: " Anna-Maria Gleixner
2016-07-19 7:14 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 34/67] arm: Convert VFP hotplug notifiers to " Anna-Maria Gleixner
2016-07-19 7:15 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 35/67] arm/perf: Convert to hotplug " Anna-Maria Gleixner
2016-07-15 13:08 ` Mark Rutland
2016-07-15 15:26 ` Sebastian Andrzej Siewior
2016-07-15 16:16 ` Mark Rutland
2016-07-19 7:16 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-19 7:35 ` Sebastian Andrzej Siewior
2016-07-19 7:48 ` Ingo Molnar
2016-07-19 9:02 ` [PATCH v2] " Sebastian Andrzej Siewior
2016-07-19 9:57 ` Mark Rutland
2016-07-19 11:17 ` [PATCH v3] " Sebastian Andrzej Siewior
2016-07-20 8:01 ` Ingo Molnar
2016-07-20 10:41 ` [tip:smp/hotplug] arm/perf: Fix hotplug state machine conversion tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 36/67] virt: Convert kvm hotplug to state machine Anna-Maria Gleixner
2016-07-19 7:16 ` tip-bot for Thomas Gleixner [this message]
2016-07-13 17:16 ` [patch V2 37/67] ACPI/processor: Avoid STARTING/DYING actions in a more logical way Anna-Maria Gleixner
2016-07-19 7:17 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 38/67] clocksource/arm_arch_timer: Convert to hotplug state machine Anna-Maria Gleixner
2016-07-19 7:17 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 39/67] clocksource/dummy_timer: " Anna-Maria Gleixner
2016-07-19 7:18 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 40/67] clocksource/metag: " Anna-Maria Gleixner
2016-07-19 7:19 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 41/67] clocksource/qcom-timer: " Anna-Maria Gleixner
2016-07-19 7:19 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 42/67] clocksource/mips-gic: " Anna-Maria Gleixner
2016-07-19 7:20 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 43/67] leds/trigger/cpu: " Anna-Maria Gleixner
2016-07-14 7:19 ` Jacek Anaszewski
2016-07-14 7:47 ` Ingo Molnar
2016-07-14 8:10 ` Jacek Anaszewski
2016-07-14 9:41 ` Peter Zijlstra
2016-07-14 11:23 ` Jacek Anaszewski
2016-07-14 11:33 ` Thomas Gleixner
2016-07-14 11:55 ` Jacek Anaszewski
2016-07-15 14:10 ` Sebastian Andrzej Siewior
2016-07-18 8:26 ` Jacek Anaszewski
2016-07-19 7:20 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 44/67] arm/kvm/vgic: " Anna-Maria Gleixner
2016-07-19 7:21 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 45/67] arm/kvm/arch_timer: " Anna-Maria Gleixner
2016-07-19 7:21 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 46/67] metag/perf: " Anna-Maria Gleixner
2016-07-19 7:22 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 47/67] arm/l2c: " Anna-Maria Gleixner
2016-07-19 7:22 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 48/67] arm/twd: " Anna-Maria Gleixner
2016-07-19 7:23 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 49/67] arm/xen: " Anna-Maria Gleixner
2016-07-13 18:21 ` Stefano Stabellini
2016-07-19 7:23 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 50/67] MIPS/Loongson-3: Convert oprofile " Anna-Maria Gleixner
2016-07-19 7:24 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 51/67] hwtracing/coresight-etm3x: Convert " Anna-Maria Gleixner
2016-07-19 7:24 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 52/67] hwtracing/coresight-etm4x: " Anna-Maria Gleixner
2016-07-19 7:25 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 53/67] arm64/armv8 deprecated: " Anna-Maria Gleixner
2016-07-19 7:25 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 54/67] x86/tboot: " Anna-Maria Gleixner
2016-07-19 7:26 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:16 ` [patch V2 55/67] hrtimer: " Anna-Maria Gleixner
2016-07-19 7:26 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:16 ` [patch V2 57/67] profile: " Anna-Maria Gleixner
2016-07-19 7:27 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:16 ` [patch V2 56/67] timers/core: " Anna-Maria Gleixner
2016-07-19 7:27 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-27 9:08 ` [PATCH] timers/core: Correct callback order during CPU hot plug Richard Cochran
2016-07-27 9:50 ` Jon Hunter
2016-07-28 15:34 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-28 16:57 ` tip-bot for Richard Cochran
2016-07-13 17:17 ` [patch V2 58/67] x86/x2apic: Convert to CPU hotplug state machine Anna-Maria Gleixner
2016-07-19 7:28 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-07-13 17:17 ` [patch V2 59/67] smp: Convert core to " Anna-Maria Gleixner
2016-07-19 7:28 ` [tip:smp/hotplug] smp/cfd: " tip-bot for Richard Weinberger
2016-07-13 17:17 ` [patch V2 60/67] KVM/arm/arm64/vgic-new: Convert " Anna-Maria Gleixner
2016-07-14 13:08 ` Marc Zyngier
2016-07-19 7:29 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-07-13 17:17 ` [patch V2 61/67] rcu: Convert rcutree " Anna-Maria Gleixner
2016-07-19 7:29 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-07-13 17:17 ` [patch V2 62/67] [PATCH] clocksource: arm_global_timer: Convert " Anna-Maria Gleixner
2016-07-19 7:30 ` [tip:smp/hotplug] clocksource/arm_global_timer: " tip-bot for Richard Cochran
2016-07-13 17:17 ` [patch V2 63/67] clocksource/exynos_mct: " Anna-Maria Gleixner
2016-07-19 7:31 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:17 ` [patch V2 64/67] clocksource/armada-370-xp: " Anna-Maria Gleixner
2016-07-19 7:31 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:17 ` [patch V2 65/67] clocksource/atlas7: " Anna-Maria Gleixner
2016-07-19 7:32 ` [tip:smp/hotplug] " tip-bot for Richard Cochran
2016-07-13 17:17 ` [patch V2 66/67] ARC/time: " Anna-Maria Gleixner
2016-07-19 7:32 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-07-13 17:17 ` [patch V2 67/67] cpuhotplug: Remove CPU_STARTING and CPU_DYING notifier Anna-Maria Gleixner
2016-07-13 19:32 ` [patch V2 00/67] cpuhotplug: Convert all priority notifiers to the state machine Jason Cooper
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