Re: [PATCH v2 1/5] iommufd: Add nesting related data structures for Intel VT-d

[Jason Gunthorpe]

On Thu, Mar 09, 2023 at 12:22:03AM -0800, Yi Liu wrote:

> +struct iommu_hwpt_invalidate_intel_vtd {
> +	__u8 granularity;
> +	__u8 padding[7];
> +	__u32 flags;
> +	__u32 __reserved;
> +	__u64 addr;
> +	__u64 granule_size;
> +	__u64 nb_granules;
> +};

Is there a reason this has such a weird layout? Put the granularity in
the __reserved slot?

Consider the discussion on ARM if you prefer to use the native HW
command structure instead?

Jason