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author | Christoffer Dall <christoffer.dall@arm.com> | 2018-11-27 13:48:08 +0100 |
---|---|---|
committer | Marc Zyngier <marc.zyngier@arm.com> | 2018-12-19 17:47:07 +0000 |
commit | 8a411b060f820140e9894239fde5819bb213bef0 (patch) | |
tree | f9bcf73cc9bf9abf9fcc845651e94dbd26303f59 /virt/kvm/arm/arch_timer.c | |
parent | 71a7e47f39a2fb971ef9934e98ba089581eff641 (diff) | |
download | linux-8a411b060f820140e9894239fde5819bb213bef0.tar.gz linux-8a411b060f820140e9894239fde5819bb213bef0.tar.bz2 linux-8a411b060f820140e9894239fde5819bb213bef0.zip |
KVM: arm/arm64: Remove arch timer workqueue
The use of a work queue in the hrtimer expire function for the bg_timer
is a leftover from the time when we would inject interrupts when the
bg_timer expired.
Since we are no longer doing that, we can instead call
kvm_vcpu_wake_up() directly from the hrtimer function and remove all
workqueue functionality from the arch timer code.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt/kvm/arm/arch_timer.c')
-rw-r--r-- | virt/kvm/arm/arch_timer.c | 34 |
1 files changed, 7 insertions, 27 deletions
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c index 17cecc96f735..da261f5e2a91 100644 --- a/virt/kvm/arm/arch_timer.c +++ b/virt/kvm/arm/arch_timer.c @@ -70,11 +70,9 @@ static void soft_timer_start(struct hrtimer *hrt, u64 ns) HRTIMER_MODE_ABS); } -static void soft_timer_cancel(struct hrtimer *hrt, struct work_struct *work) +static void soft_timer_cancel(struct hrtimer *hrt) { hrtimer_cancel(hrt); - if (work) - cancel_work_sync(work); } static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id) @@ -102,23 +100,6 @@ static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id) return IRQ_HANDLED; } -/* - * Work function for handling the backup timer that we schedule when a vcpu is - * no longer running, but had a timer programmed to fire in the future. - */ -static void kvm_timer_inject_irq_work(struct work_struct *work) -{ - struct kvm_vcpu *vcpu; - - vcpu = container_of(work, struct kvm_vcpu, arch.timer_cpu.expired); - - /* - * If the vcpu is blocked we want to wake it up so that it will see - * the timer has expired when entering the guest. - */ - kvm_vcpu_wake_up(vcpu); -} - static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx) { u64 cval, now; @@ -188,7 +169,7 @@ static enum hrtimer_restart kvm_bg_timer_expire(struct hrtimer *hrt) return HRTIMER_RESTART; } - schedule_work(&timer->expired); + kvm_vcpu_wake_up(vcpu); return HRTIMER_NORESTART; } @@ -300,7 +281,7 @@ static void phys_timer_emulate(struct kvm_vcpu *vcpu) * then we also don't need a soft timer. */ if (kvm_timer_should_fire(ptimer) || !kvm_timer_irq_can_fire(ptimer)) { - soft_timer_cancel(&timer->phys_timer, NULL); + soft_timer_cancel(&timer->phys_timer); return; } @@ -426,7 +407,7 @@ void kvm_timer_unschedule(struct kvm_vcpu *vcpu) vtimer_restore_state(vcpu); - soft_timer_cancel(&timer->bg_timer, &timer->expired); + soft_timer_cancel(&timer->bg_timer); } static void set_cntvoff(u64 cntvoff) @@ -544,7 +525,7 @@ void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu) * In any case, we re-schedule the hrtimer for the physical timer when * coming back to the VCPU thread in kvm_timer_vcpu_load(). */ - soft_timer_cancel(&timer->phys_timer, NULL); + soft_timer_cancel(&timer->phys_timer); /* * The kernel may decide to run userspace after calling vcpu_put, so @@ -637,7 +618,6 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu) update_vtimer_cntvoff(vcpu, kvm_phys_timer_read()); vcpu_ptimer(vcpu)->cntvoff = 0; - INIT_WORK(&timer->expired, kvm_timer_inject_irq_work); hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); timer->bg_timer.function = kvm_bg_timer_expire; @@ -794,8 +774,8 @@ void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu) struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); - soft_timer_cancel(&timer->bg_timer, &timer->expired); - soft_timer_cancel(&timer->phys_timer, NULL); + soft_timer_cancel(&timer->bg_timer); + soft_timer_cancel(&timer->phys_timer); kvm_vgic_unmap_phys_irq(vcpu, vtimer->irq.irq); } |