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Message-ID: <8637g29isu.fsf@arm.com>
Date: Sun, 29 Jan 2017 12:01:21 +0000
From: Marc Zyngier <marc.zyngier@....com>
To: Jintack Lim <jintack@...columbia.edu>
Cc: <pbonzini@...hat.com>, <rkrcmar@...hat.com>,
<christoffer.dall@...aro.org>, <linux@...linux.org.uk>,
<catalin.marinas@....com>, <will.deacon@....com>,
<andre.przywara@....com>, <kvm@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2 03/10] KVM: arm/arm64: Decouple kvm timer functions from virtual timer
On Fri, Jan 27 2017 at 01:04:53 AM, Jintack Lim <jintack@...columbia.edu> wrote:
> Now that we have a separate structure for timer context, make functions
> general so that they can work with any timer context, not just the
generic?
> virtual timer context. This does not change the virtual timer
> functionality.
>
> Signed-off-by: Jintack Lim <jintack@...columbia.edu>
> ---
> arch/arm/kvm/arm.c | 2 +-
> include/kvm/arm_arch_timer.h | 3 ++-
> virt/kvm/arm/arch_timer.c | 55 ++++++++++++++++++++++----------------------
> 3 files changed, 30 insertions(+), 30 deletions(-)
>
> diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
> index 9d74464..9a34a3c 100644
> --- a/arch/arm/kvm/arm.c
> +++ b/arch/arm/kvm/arm.c
> @@ -301,7 +301,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
>
> int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
> {
> - return kvm_timer_should_fire(vcpu);
> + return kvm_timer_should_fire(vcpu, vcpu_vtimer(vcpu));
> }
>
> void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
> diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h
> index 1b9c988..d921d20 100644
> --- a/include/kvm/arm_arch_timer.h
> +++ b/include/kvm/arm_arch_timer.h
> @@ -67,7 +67,8 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
> u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
> int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
>
> -bool kvm_timer_should_fire(struct kvm_vcpu *vcpu);
> +bool kvm_timer_should_fire(struct kvm_vcpu *vcpu,
> + struct arch_timer_context *timer_ctx);
> void kvm_timer_schedule(struct kvm_vcpu *vcpu);
> void kvm_timer_unschedule(struct kvm_vcpu *vcpu);
>
> diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
> index fa4c042..f72005a 100644
> --- a/virt/kvm/arm/arch_timer.c
> +++ b/virt/kvm/arm/arch_timer.c
> @@ -98,13 +98,13 @@ static void kvm_timer_inject_irq_work(struct work_struct *work)
> kvm_vcpu_kick(vcpu);
> }
>
> -static u64 kvm_timer_compute_delta(struct kvm_vcpu *vcpu)
> +static u64 kvm_timer_compute_delta(struct kvm_vcpu *vcpu,
> + struct arch_timer_context *timer_ctx)
> {
> u64 cval, now;
> - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
>
> - cval = vtimer->cnt_cval;
> - now = kvm_phys_timer_read() - vtimer->cntvoff;
> + cval = timer_ctx->cnt_cval;
> + now = kvm_phys_timer_read() - timer_ctx->cntvoff;
>
> if (now < cval) {
> u64 ns;
> @@ -133,7 +133,7 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt)
> * PoV (NTP on the host may have forced it to expire
> * early). If we should have slept longer, restart it.
> */
> - ns = kvm_timer_compute_delta(vcpu);
> + ns = kvm_timer_compute_delta(vcpu, vcpu_vtimer(vcpu));
> if (unlikely(ns)) {
> hrtimer_forward_now(hrt, ns_to_ktime(ns));
> return HRTIMER_RESTART;
> @@ -143,42 +143,40 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt)
> return HRTIMER_NORESTART;
> }
>
> -static bool kvm_timer_irq_can_fire(struct kvm_vcpu *vcpu)
> +static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx)
> {
> - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
> -
> - return !(vtimer->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) &&
> - (vtimer->cnt_ctl & ARCH_TIMER_CTRL_ENABLE);
> + return !(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) &&
> + (timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_ENABLE);
> }
>
> -bool kvm_timer_should_fire(struct kvm_vcpu *vcpu)
> +bool kvm_timer_should_fire(struct kvm_vcpu *vcpu,
> + struct arch_timer_context *timer_ctx)
> {
> - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
> u64 cval, now;
>
> - if (!kvm_timer_irq_can_fire(vcpu))
> + if (!kvm_timer_irq_can_fire(timer_ctx))
> return false;
>
> - cval = vtimer->cnt_cval;
> - now = kvm_phys_timer_read() - vtimer->cntvoff;
> + cval = timer_ctx->cnt_cval;
> + now = kvm_phys_timer_read() - timer_ctx->cntvoff;
>
> return cval <= now;
> }
>
> -static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level)
> +static void kvm_timer_update_mapped_irq(struct kvm_vcpu *vcpu, bool new_level,
> + struct arch_timer_context *timer_ctx)
> {
> int ret;
> - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
>
> BUG_ON(!vgic_initialized(vcpu->kvm));
>
> - vtimer->active_cleared_last = false;
> - vtimer->irq.level = new_level;
> - trace_kvm_timer_update_irq(vcpu->vcpu_id, vtimer->irq.irq,
> - vtimer->irq.level);
> + timer_ctx->active_cleared_last = false;
> + timer_ctx->irq.level = new_level;
> + trace_kvm_timer_update_irq(vcpu->vcpu_id, timer_ctx->irq.irq,
> + timer_ctx->irq.level);
> ret = kvm_vgic_inject_mapped_irq(vcpu->kvm, vcpu->vcpu_id,
> - vtimer->irq.irq,
> - vtimer->irq.level);
> + timer_ctx->irq.irq,
> + timer_ctx->irq.level);
> WARN_ON(ret);
> }
>
> @@ -200,8 +198,8 @@ static int kvm_timer_update_state(struct kvm_vcpu *vcpu)
> if (!vgic_initialized(vcpu->kvm) || !timer->enabled)
> return -ENODEV;
>
> - if (kvm_timer_should_fire(vcpu) != vtimer->irq.level)
> - kvm_timer_update_irq(vcpu, !vtimer->irq.level);
> + if (kvm_timer_should_fire(vcpu, vtimer) != vtimer->irq.level)
> + kvm_timer_update_mapped_irq(vcpu, !vtimer->irq.level, vtimer);
>
> return 0;
> }
> @@ -214,6 +212,7 @@ static int kvm_timer_update_state(struct kvm_vcpu *vcpu)
> void kvm_timer_schedule(struct kvm_vcpu *vcpu)
> {
> struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
> + struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
>
> BUG_ON(timer_is_armed(timer));
>
> @@ -222,18 +221,18 @@ void kvm_timer_schedule(struct kvm_vcpu *vcpu)
> * already expired, because kvm_vcpu_block will return before putting
> * the thread to sleep.
> */
> - if (kvm_timer_should_fire(vcpu))
> + if (kvm_timer_should_fire(vcpu, vtimer))
> return;
>
> /*
> * If the timer is not capable of raising interrupts (disabled or
> * masked), then there's no more work for us to do.
> */
> - if (!kvm_timer_irq_can_fire(vcpu))
> + if (!kvm_timer_irq_can_fire(vtimer))
> return;
>
> /* The timer has not yet expired, schedule a background timer */
> - timer_arm(timer, kvm_timer_compute_delta(vcpu));
> + timer_arm(timer, kvm_timer_compute_delta(vcpu, vtimer));
> }
>
> void kvm_timer_unschedule(struct kvm_vcpu *vcpu)
Acked-by: Marc Zyngier <marc.zyngier@....com>
M.
--
Jazz is not dead. It just smells funny.
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