linux-kernel - Re: [PATCH v1 14/14] iommu/arm-smmu-v3: Add arm_smmu_cache_invalidate

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Date:   Mon, 20 Mar 2023 10:11:54 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Nicolin Chen <nicolinc@...dia.com>
Cc:     Robin Murphy <robin.murphy@....com>, will@...nel.org,
        eric.auger@...hat.com, kevin.tian@...el.com,
        baolu.lu@...ux.intel.com, joro@...tes.org,
        shameerali.kolothum.thodi@...wei.com, jean-philippe@...aro.org,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 14/14] iommu/arm-smmu-v3: Add
 arm_smmu_cache_invalidate_user

On Sun, Mar 19, 2023 at 06:32:03PM -0700, Nicolin Chen wrote:

> +struct iommu_hwpt_invalidate_arm_smmuv3 {
> +       struct iommu_iova_range range;

what is this?

> +       __u64 cmd[2];
> +};

You still have to do something with the SID. We can't just allow any
un-validated SID value - the driver has to check the incoming SID
against allowed SIDs for this iommufd_ctx

Jason