Re: [PATCH RFC 12/13] iommu/vt-d: Add a helper to retrieve PID address

[Thomas Gleixner]

On Sat, Nov 11 2023 at 20:16, Jacob Pan wrote:
> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>
> When programming IRTE for posted mode, we need to retrieve the
> physical

we need .... I surely did not write this changelog.

> address of the posted interrupt descriptor (PID) that belongs to it's
> target CPU.
>
> This per CPU PID has already been set up during cpu_init().

This information is useful because?

> +static u64 get_pi_desc_addr(struct irq_data *irqd)
> +{
> +	int cpu = cpumask_first(irq_data_get_effective_affinity_mask(irqd));

The effective affinity mask is magically correct when this is called?