Re: [Xen-devel] [PATCH 3/3] VMX: Remove the vcpu from the per-cpu blocking list after domain termination

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.05.16 at 10:53, <feng.wu@xxxxxxxxx> wrote:
> --- a/xen/arch/x86/hvm/vmx/vmx.c
> +++ b/xen/arch/x86/hvm/vmx/vmx.c
> @@ -248,6 +248,36 @@ void vmx_pi_hooks_deassign(struct domain *d)
>      d->arch.hvm_domain.vmx.pi_switch_to = NULL;
>  }
>  
> +static void vmx_pi_blocking_list_cleanup(struct domain *d)
> +{
> +    unsigned int cpu;
> +
> +    for_each_online_cpu ( cpu )
> +    {
> +        struct vcpu *v;
> +        unsigned long flags;
> +        struct arch_vmx_struct *vmx, *tmp;
> +        spinlock_t *lock = &per_cpu(vmx_pi_blocking, cpu).lock;
> +        struct list_head *blocked_vcpus = &per_cpu(vmx_pi_blocking, 
> cpu).list;
> +
> +        spin_lock_irqsave(lock, flags);
> +
> +        list_for_each_entry_safe(vmx, tmp, blocked_vcpus, pi_blocking.list)
> +        {

Did you consider how long these two nested loops may take on a
large system?

Jan


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