linux-kernel - Re: [PATCH v3 02/17] iommu: Add nested domain support

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Date:   Wed, 2 Aug 2023 19:36:44 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     Yi Liu <yi.l.liu@...el.com>, <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>,
        <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>,
        <zhenzhong.duan@...el.com>
Subject: Re: [PATCH v3 02/17] iommu: Add nested domain support

On Fri, Jul 28, 2023 at 01:59:28PM -0300, Jason Gunthorpe wrote:
> On Mon, Jul 24, 2023 at 04:03:51AM -0700, Yi Liu wrote:
> 
> > @@ -350,6 +354,10 @@ struct iommu_ops {
> >   * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
> >   * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
> >   *            queue
> > + * @cache_invalidate_user: Flush hardware TLBs caching user space IO mappings
> > + * @cache_invalidate_user_data_len: Defined length of input user data for the
> > + *                                  cache_invalidate_user op, being sizeof the
> > + *                                  structure in include/uapi/linux/iommufd.h
> >   * @iova_to_phys: translate iova to physical address
> >   * @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
> >   *                           including no-snoop TLPs on PCIe or other platform
> > @@ -379,6 +387,9 @@ struct iommu_domain_ops {
> >  			       size_t size);
> >  	void (*iotlb_sync)(struct iommu_domain *domain,
> >  			   struct iommu_iotlb_gather *iotlb_gather);
> > +	int (*cache_invalidate_user)(struct iommu_domain *domain,
> > +				     void *user_data);
> 
> If we are doing const unions, then this void * should also be a const
> union.

Unlike iommu_domain_user_data is a union on its own, all invalidate
user data structures are added to union ucmd_buffer. It feels a bit
weird to cross reference "union ucmd_buffer" and to pass the naming
"ucmd_buffer" in this cache_invalidate_user.

Any suggestion?

Thanks
Nic