RE: [PATCH 07/12] iommufd: Add IOMMU_HWPT_INVALIDATE

[Liu, Yi L]

> From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Sent: Saturday, March 11, 2023 1:50 AM
> 
> On Thu, Mar 09, 2023 at 12:09:05AM -0800, Yi Liu wrote:
> > +int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd)
> > +{
> > +	struct iommu_hwpt_invalidate *cmd = ucmd->cmd;
> > +	struct iommufd_hw_pagetable *hwpt;
> > +	u64 user_ptr;
> > +	u32 user_data_len, klen;
> > +	int rc = 0;
> > +
> > +	/*
> > +	 * For a user-managed HWPT, type should not be
> IOMMU_HWPT_TYPE_DEFAULT.
> > +	 * data_len should not exceed the size of
> iommufd_invalidate_buffer.
> > +	 */
> > +	if (cmd->data_type == IOMMU_HWPT_TYPE_DEFAULT || !cmd-
> >data_len ||
> > +	    cmd->data_type >=
> ARRAY_SIZE(iommufd_hwpt_invalidate_info_size))
> > +		return -EOPNOTSUPP;
> 
> This needs to do the standard check for zeros in unknown trailing data
> bit. Check that alloc does it too

Yes. would add it in both path.

Regards,
Yi Liu