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

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Message-ID: <ZMPz8MIevHBd6zsI@nvidia.com>
Date:   Fri, 28 Jul 2023 13:59:28 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Yi Liu <yi.l.liu@...el.com>
Cc:     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, nicolinc@...dia.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 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.

Jason