linux-kernel - Re: [PATCH v2 04/11] iommufd: Pass parent hwpt and user_data to iommufd_hw_pagetable

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Message-ID: <ZGfKGR7NfYzEbIxz@Asurada-Nvidia>
Date:   Fri, 19 May 2023 12:12:25 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.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>,
        "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>,
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        "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>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>
Subject: Re: [PATCH v2 04/11] iommufd: Pass parent hwpt and user_data to
 iommufd_hw_pagetable_alloc()

On Fri, May 19, 2023 at 09:34:38AM +0000, Tian, Kevin wrote:

> > From: Liu, Yi L <yi.l.liu@...el.com>
> > Sent: Thursday, May 11, 2023 10:39 PM
> > @@ -89,9 +101,15 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx
> > *ictx, struct iommufd_ioas *ioas,
> >       /* Pairs with iommufd_hw_pagetable_destroy() */
> >       refcount_inc(&ioas->obj.users);
> >       hwpt->ioas = ioas;
> 
> presumably a user hwpt doesn't need store ioas?

hwpt->ioas has the refcount and mutex that are used by a user
hwpt too throughout the hwpt functions.

Thanks
Nic