Re: [Xen-devel] [PATCH v7 16/28] xen/arm: ITS: Add virtual ITS commands support

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Vijay,

On 18/09/15 14:09, vijay.kilari@xxxxxxxxx wrote:
> From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
> 
> Add Virtual ITS command processing support to Virtual ITS driver
> 
> Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>

I've got minor comments in vits_get_max_collections. With that addressed:

Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>


[...]

> +static inline uint16_t vits_get_max_collections(struct domain *d)
> +{
> +    /*
> +     * ITS only supports up to 256 collections without
> +     * provisioning external memory. As per vITS design, number of
> +     * vCPUS should not exceed max number of collections.
> +     */
> +    ASSERT(d->max_vcpus < 256);
> +
> +    /* Each collection corresponds to one CPU(vCPU). collections are

NIT: The coding style for comment is

/*
 * My comments
 * ...
 */

s/collections are/Collections/

> +     * used to move interrupts from one CPU to another. The ITS
> +     * mandated to implement N + 1 collections where N is the number of

s/mandated/mandates/

> +     * processor on the platform (i.e max number of VCPUs for a given
> +     * guest).

I was about to suggestion mention the section in the spec. Although I'm
not able to find a related section in the Public doc (IHI0069A).

Might still be worth to mention the PRD03-GENC-010745 24 section 4.9.15?

> +     */
> +    return (d->max_vcpus + 1);
> +}

Regards,


-- 
Julien Grall

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