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

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Message-ID: <ZBhWHWP9BqCzVIAZ@nvidia.com>
Date:   Mon, 20 Mar 2023 09:48:29 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>
Cc:     "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 07/12] iommufd: Add IOMMU_HWPT_INVALIDATE

On Tue, Mar 14, 2023 at 04:18:21AM +0000, Liu, Yi L wrote:
> > From: Jason Gunthorpe <jgg@...dia.com>
> > 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
> 
> Maybe it has been covered by the copy_struct_from_user(). Is it?

Yes

Jason