From: "Tian, Kevin" <kevin.tian@intel.com>
To: Baolu Lu <baolu.lu@linux.intel.com>,
Jason Gunthorpe <jgg@ziepe.ca>, "Joerg Roedel" <joro@8bytes.org>,
Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Nicolin Chen <nicolinc@nvidia.com>,
"Liu, Yi L" <yi.l.liu@intel.com>,
"Jacob Pan" <jacob.jun.pan@linux.intel.com>,
Joel Granados <j.granados@samsung.com>
Cc: "iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v5 7/9] iommufd: Associate fault object with iommufd_hw_pgtable
Date: Mon, 20 May 2024 03:39:54 +0000 [thread overview]
Message-ID: <BN9PR11MB5276F07A130CD617777A3AAD8CE92@BN9PR11MB5276.namprd11.prod.outlook.com> (raw)
In-Reply-To: <b09f96db-8451-4de9-81c5-312cffdfd4fc@linux.intel.com>
> From: Baolu Lu <baolu.lu@linux.intel.com>
> Sent: Monday, May 20, 2024 10:19 AM
>
> On 5/15/24 4:50 PM, Tian, Kevin wrote:
> >> From: Lu Baolu <baolu.lu@linux.intel.com>
> >> Sent: Tuesday, April 30, 2024 10:57 PM
> >>
> >> @@ -308,6 +314,19 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd
> >> *ucmd)
> >> goto out_put_pt;
> >> }
> >>
> >> + if (cmd->flags & IOMMU_HWPT_FAULT_ID_VALID) {
> >> + struct iommufd_fault *fault;
> >> +
> >> + fault = iommufd_get_fault(ucmd, cmd->fault_id);
> >> + if (IS_ERR(fault)) {
> >> + rc = PTR_ERR(fault);
> >> + goto out_hwpt;
> >> + }
> >> + hwpt->fault = fault;
> >> + hwpt->domain->iopf_handler = iommufd_fault_iopf_handler;
> >> + hwpt->domain->fault_data = hwpt;
> >> + }
> >
> > this is nesting specific. why not moving it to the nested_alloc()?
>
> Nesting is currently a use case for userspace I/O page faults, but this
> design should be general enough to support other scenarios as well.
>
Do we allow user page table w/o nesting?
What would be a scenario in which the user doesn't manage the
page table but still want to handle the I/O page fault? The fault
should always be delivered to the owner managing the page table...
next prev parent reply other threads:[~2024-05-20 3:39 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-30 14:57 [PATCH v5 0/9] IOMMUFD: Deliver IO page faults to user space Lu Baolu
2024-04-30 14:57 ` [PATCH v5 1/9] iommu: Introduce domain attachment handle Lu Baolu
2024-05-15 7:17 ` Tian, Kevin
2024-05-19 10:07 ` Baolu Lu
2024-04-30 14:57 ` [PATCH v5 2/9] iommu: Replace sva_iommu with iommu_attach_handle Lu Baolu
2024-05-07 23:58 ` Jason Gunthorpe
2024-05-15 7:21 ` Tian, Kevin
2024-05-19 10:14 ` Baolu Lu
2024-05-20 3:18 ` Tian, Kevin
2024-04-30 14:57 ` [PATCH v5 3/9] iommu: Add attachment handle to struct iopf_group Lu Baolu
2024-05-08 0:04 ` Jason Gunthorpe
2024-05-10 3:14 ` Baolu Lu
2024-05-10 13:38 ` Jason Gunthorpe
2024-05-10 14:30 ` Baolu Lu
2024-05-10 16:28 ` Jason Gunthorpe
2024-05-15 7:28 ` Tian, Kevin
2024-05-15 7:31 ` Tian, Kevin
2024-05-19 14:03 ` Baolu Lu
2024-05-20 3:20 ` Tian, Kevin
2024-04-30 14:57 ` [PATCH v5 4/9] iommufd: Add fault and response message definitions Lu Baolu
2024-05-15 7:43 ` Tian, Kevin
2024-05-19 14:37 ` Baolu Lu
2024-05-20 3:24 ` Tian, Kevin
2024-05-20 3:33 ` Baolu Lu
2024-05-20 4:59 ` Tian, Kevin
2024-05-24 14:15 ` Jason Gunthorpe
2024-05-27 1:27 ` Tian, Kevin
2024-04-30 14:57 ` [PATCH v5 5/9] iommufd: Add iommufd fault object Lu Baolu
2024-05-08 0:11 ` Jason Gunthorpe
2024-05-08 10:05 ` Baolu Lu
2024-05-15 7:57 ` Tian, Kevin
2024-05-20 0:41 ` Baolu Lu
2024-05-20 3:26 ` Tian, Kevin
2024-05-20 3:28 ` Baolu Lu
2024-05-08 0:22 ` Jason Gunthorpe
2024-05-10 9:13 ` Baolu Lu
2024-05-15 8:37 ` Tian, Kevin
2024-05-20 1:15 ` Baolu Lu
2024-05-20 1:24 ` Baolu Lu
2024-05-24 14:16 ` Jason Gunthorpe
2024-05-20 1:33 ` Baolu Lu
2024-05-20 3:33 ` Tian, Kevin
2024-05-20 1:38 ` Baolu Lu
2024-04-30 14:57 ` [PATCH v5 6/9] iommufd: Fault-capable hwpt attach/detach/replace Lu Baolu
2024-05-08 0:18 ` Jason Gunthorpe
2024-05-10 3:20 ` Baolu Lu
2024-05-10 13:39 ` Jason Gunthorpe
2024-05-15 8:43 ` Tian, Kevin
2024-05-20 2:10 ` Baolu Lu
2024-05-20 3:35 ` Tian, Kevin
2024-05-20 3:55 ` Baolu Lu
2024-04-30 14:57 ` [PATCH v5 7/9] iommufd: Associate fault object with iommufd_hw_pgtable Lu Baolu
2024-05-08 0:25 ` Jason Gunthorpe
2024-05-10 3:23 ` Baolu Lu
2024-05-15 8:50 ` Tian, Kevin
2024-05-20 2:18 ` Baolu Lu
2024-05-20 3:39 ` Tian, Kevin [this message]
2024-05-20 4:00 ` Baolu Lu
2024-05-24 14:24 ` Jason Gunthorpe
2024-05-27 1:33 ` Tian, Kevin
2024-05-27 3:16 ` Baolu Lu
2024-04-30 14:57 ` [PATCH v5 8/9] iommufd/selftest: Add IOPF support for mock device Lu Baolu
2024-04-30 14:57 ` [PATCH v5 9/9] iommufd/selftest: Add coverage for IOPF test Lu Baolu
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