> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Saturday, July 21, 2012 2:59 AM
> To: Bhushan Bharat-R65777
> Cc: kvm-ppc@xxxxxxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; agraf@xxxxxxx; Bhushan Bharat-
> R65777
> Subject: Re: [PATCH 2/2 v5] KVM: PPC: booke: Add watchdog emulation
>
> On 07/20/2012 12:00 AM, Bharat Bhushan wrote:
> > This patch adds the watchdog emulation in KVM. The watchdog emulation
> > is enabled by KVM_ENABLE_CAP(KVM_CAP_PPC_WDT) ioctl.
> > The kernel timer are used for watchdog emulation and emulates h/w
> > watchdog state machine. On watchdog timer expiry, it exit to QEMU if
> > TCR.WRC is non ZERO. QEMU can reset/shutdown etc depending upon how it
> > is configured.
> >
> > Signed-off-by: Liu Yu <yu.liu@xxxxxxxxxxxxx>
> > Signed-off-by: Scott Wood <scottwood@xxxxxxxxxxxxx>
> > Signed-off-by: Bharat Bhushan <bharat.bhushan@xxxxxxxxxxxxx>
> > [bharat.bhushan@xxxxxxxxxxxxx: reworked patch]
>
> Typically the [] note goes immediately before your signoff (but after the
> others).
>
> > +static void arm_next_watchdog(struct kvm_vcpu *vcpu) {
> > + unsigned long nr_jiffies;
> > +
> > + spin_lock(&vcpu->arch.wdt_lock);
> > + nr_jiffies = watchdog_next_timeout(vcpu);
> > + /*
> > + * If the number of jiffies of watchdog timer >= NEXT_TIMER_MAX_DELTA
> > + * then do not run the watchdog timer as this can break timer APIs.
> > + */
> > + if (nr_jiffies < NEXT_TIMER_MAX_DELTA)
> > + mod_timer(&vcpu->arch.wdt_timer, jiffies + nr_jiffies);
> > + else
> > + del_timer(&vcpu->arch.wdt_timer);
> > + spin_unlock(&vcpu->arch.wdt_lock);
> > +}
>
> This needs to be an irqsave lock.
>
> > @@ -386,13 +387,23 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
> > #ifdef CONFIG_KVM_EXIT_TIMING
> > mutex_init(&vcpu->arch.exit_timing_lock);
> > #endif
> > -
> > +#ifdef CONFIG_BOOKE
> > + spin_lock_init(&vcpu->arch.wdt_lock);
> > + /* setup watchdog timer once */
> > + setup_timer(&vcpu->arch.wdt_timer, kvmppc_watchdog_func,
> > + (unsigned long)vcpu);
> > +#endif
> > return 0;
> > }
>
> Can you do this in kvmppc_booke_init()?
I do not think we can do this in kvmppc_booke_init(). Watchdog have association with vcpu, while there is no vcpu at kvmppc_booke_init().
Thanks
-Bharat
>
> >
> > void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {
> > kvmppc_mmu_destroy(vcpu);
> > +#ifdef CONFIG_BOOKE
> > + spin_lock(&vcpu->arch.wdt_lock);
> > + del_timer(&vcpu->arch.wdt_timer);
> > + spin_unlock(&vcpu->arch.wdt_lock);
> > +#endif
> > }
>
> Don't acquire the lock here, but use del_timer_sync().
>
> -Scott
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