linux-kernel - Re: [PATCH 06/17] iommufd/hw_pagetable: Use domain_alloc

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Date:   Thu, 9 Feb 2023 14:36:49 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>
Cc:     Yi Liu <yi.l.liu@...el.com>, joro@...tes.org,
        alex.williamson@...hat.com, kevin.tian@...el.com,
        robin.murphy@....com, cohuck@...hat.com, eric.auger@...hat.com,
        nicolinc@...dia.com, kvm@...r.kernel.org,
        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,
        baolu.lu@...ux.intel.com
Subject: Re: [PATCH 06/17] iommufd/hw_pagetable: Use domain_alloc_user op for
 domain allocation

On Thu, Feb 09, 2023 at 12:59:58PM -0500, Matthew Rosato wrote:
> really should highlight that).  Otherwise, conditionally calling
> iommu_domain_alloc(dev->bus) when !ops->domain_alloc_user (instead
> of returning -EOPNOTSUPP) seems to restore the prior functionality
> for me.

Yes, that is right if the input user data is 0 length or full of 0s
then we should call the normal driver function

Jason