linux-kernel - Re: [PATCH 07/12] iommufd: Add IOMMU_HWPT

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Date:   Fri, 10 Mar 2023 13:50:24 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Yi Liu <yi.l.liu@...el.com>
Cc:     joro@...tes.org, alex.williamson@...hat.com, kevin.tian@...el.com,
        robin.murphy@....com, baolu.lu@...ux.intel.com, cohuck@...hat.com,
        eric.auger@...hat.com, nicolinc@...dia.com, kvm@...r.kernel.org,
        mjrosato@...ux.ibm.com, chao.p.peng@...ux.intel.com,
        yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 07/12] iommufd: Add IOMMU_HWPT_INVALIDATE

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

Jason