From: Jason Gunthorpe <jgg@nvidia.com>
To: Yi Liu <yi.l.liu@intel.com>
Cc: alex.williamson@redhat.com, kevin.tian@intel.com,
joro@8bytes.org, robin.murphy@arm.com, cohuck@redhat.com,
eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org,
mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com,
yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com,
shameerali.kolothum.thodi@huawei.com, lulu@redhat.com,
suravee.suthikulpanit@amd.com,
intel-gvt-dev@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org, linux-s390@vger.kernel.org,
xudong.hao@intel.com, yan.y.zhao@intel.com,
terrence.xu@intel.com
Subject: Re: [PATCH v1 1/5] iommufd: Create access in vfio_iommufd_emulated_bind()
Date: Fri, 10 Mar 2023 13:36:22 -0400 [thread overview]
Message-ID: <ZAtqlnCk7uccR5E7@nvidia.com> (raw)
In-Reply-To: <20230308131340.459224-2-yi.l.liu@intel.com>
On Wed, Mar 08, 2023 at 05:13:36AM -0800, Yi Liu wrote:
> +int iommufd_access_set_ioas(struct iommufd_access *access, u32 ioas_id)
> +{
> + struct iommufd_ioas *new_ioas = NULL, *cur_ioas;
> + struct iommufd_ctx *ictx = access->ictx;
> + struct iommufd_object *obj;
> + int rc = 0;
> +
> + if (ioas_id) {
> + obj = iommufd_get_object(ictx, ioas_id, IOMMUFD_OBJ_IOAS);
> + if (IS_ERR(obj))
> + return PTR_ERR(obj);
> + new_ioas = container_of(obj, struct iommufd_ioas, obj);
> + }
> +
> + mutex_lock(&access->ioas_lock);
> + cur_ioas = access->ioas;
> + if (cur_ioas == new_ioas)
> + goto out_unlock;
> +
> + if (new_ioas) {
> + rc = iopt_add_access(&new_ioas->iopt, access);
> + if (rc)
> + goto out_unlock;
> + iommufd_ref_to_users(obj);
> + }
> +
> + if (cur_ioas) {
> + iopt_remove_access(&cur_ioas->iopt, access);
> + refcount_dec(&cur_ioas->obj.users);
> + }
This should match the physical side with an add/remove/replace
API. Especially since remove is implicit in destroy this series only
needs the add API
And the locking shouldn't come in another patch that brings the
replace/remove since with just split add we don't need it.
That will make this patch alot smaller
Jason
next prev parent reply other threads:[~2023-03-10 17:37 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-08 13:13 [PATCH v1 0/5] vfio: Make emulated devices prepared for vfio device cdev Yi Liu
2023-03-08 13:13 ` [PATCH v1 1/5] iommufd: Create access in vfio_iommufd_emulated_bind() Yi Liu
2023-03-10 2:08 ` Tian, Kevin
2023-03-14 18:50 ` Nicolin Chen
2023-03-15 6:16 ` Tian, Kevin
2023-03-15 6:21 ` Nicolin Chen
2023-03-15 6:52 ` Tian, Kevin
2023-03-15 8:52 ` Liu, Yi L
2023-03-16 0:17 ` Tian, Kevin
2023-03-16 0:28 ` Nicolin Chen
2023-03-10 17:36 ` Jason Gunthorpe [this message]
2023-03-14 8:20 ` Nicolin Chen
2023-03-15 1:01 ` Nicolin Chen
2023-03-15 6:15 ` Tian, Kevin
2023-03-15 6:32 ` Nicolin Chen
2023-03-15 6:50 ` Tian, Kevin
2023-03-15 9:03 ` Nicolin Chen
2023-03-15 12:18 ` Liu, Yi L
2023-03-16 0:32 ` Nicolin Chen
2023-03-16 2:53 ` Tian, Kevin
2023-03-16 3:25 ` Nicolin Chen
2023-03-16 5:33 ` Nicolin Chen
2023-03-16 5:38 ` Tian, Kevin
2023-03-16 5:43 ` Nicolin Chen
2023-03-16 5:49 ` Tian, Kevin
2023-03-16 5:56 ` Nicolin Chen
2023-03-16 6:01 ` Liu, Yi L
2023-03-20 14:49 ` Jason Gunthorpe
2023-03-20 15:11 ` Yi Liu
2023-03-20 15:33 ` Jason Gunthorpe
2023-03-08 13:13 ` [PATCH v1 2/5] vfio-iommufd: No need to record iommufd_ctx in vfio_device Yi Liu
2023-03-10 17:37 ` Jason Gunthorpe
2023-03-08 13:13 ` [PATCH v1 3/5] vfio-iommufd: Make vfio_iommufd_emulated_bind() return iommufd_access ID Yi Liu
2023-03-10 2:08 ` Tian, Kevin
2023-03-10 17:37 ` Jason Gunthorpe
2023-03-08 13:13 ` [PATCH v1 4/5] Samples/mdev: Uses the vfio emulated iommufd ops set in the mdev sample drivers Yi Liu
2023-03-10 2:10 ` Tian, Kevin
2023-03-10 17:39 ` Jason Gunthorpe
2023-03-08 13:13 ` [PATCH v1 5/5] vfio: Check the presence for iommufd callbacks in __vfio_register_dev() Yi Liu
2023-03-10 2:15 ` Tian, Kevin
2023-03-10 14:04 ` Jason Gunthorpe
2023-03-10 14:12 ` Liu, Yi L
2023-03-10 15:25 ` Jason Gunthorpe
2023-03-13 1:49 ` Tian, Kevin
2023-03-10 17:39 ` Jason Gunthorpe
2023-03-15 12:15 ` Liu, Yi L
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