From: Jason Gunthorpe <jgg@nvidia.com>
To: Nicolin Chen <nicolinc@nvidia.com>
Cc: kevin.tian@intel.com, corbet@lwn.net, will@kernel.org,
joro@8bytes.org, suravee.suthikulpanit@amd.com,
robin.murphy@arm.com, dwmw2@infradead.org,
baolu.lu@linux.intel.com, shuah@kernel.org,
linux-kernel@vger.kernel.org, iommu@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org,
eric.auger@redhat.com, jean-philippe@linaro.org, mdf@kernel.org,
mshavit@google.com, shameerali.kolothum.thodi@huawei.com,
smostafa@google.com, ddutile@redhat.com, yi.l.liu@intel.com,
patches@lists.linux.dev
Subject: Re: [PATCH v5 08/14] iommufd/viommu: Add iommufd_viommu_report_event helper
Date: Thu, 23 Jan 2025 09:43:42 -0400 [thread overview]
Message-ID: <20250123134342.GP5556@nvidia.com> (raw)
In-Reply-To: <Z5Hpo+Q6gcwc0+r6@nvidia.com>
On Wed, Jan 22, 2025 at 11:02:59PM -0800, Nicolin Chen wrote:
> I made a change to duplicate the overflow node in the fetch() that
> is protected by the spinlock, which is used for copy_to_user. Then
> the other routine for vEVENT reporting, protected by the spinlock,
> can race-freely update the preallocated overflow node.
That seems like the right answer, copy the few bytes you need on
the stack under the spinlock.
Jason
next prev parent reply other threads:[~2025-01-23 13:43 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-07 17:10 [PATCH v5 00/14] iommufd: Add vIOMMU infrastructure (Part-3: vEVENTQ) Nicolin Chen
2025-01-07 17:10 ` [PATCH v5 01/14] iommufd: Keep OBJ/IOCTL lists in an alphabetical order Nicolin Chen
2025-01-10 6:26 ` Tian, Kevin
2025-01-10 17:25 ` Jason Gunthorpe
2025-01-14 19:29 ` Jason Gunthorpe
2025-01-07 17:10 ` [PATCH v5 02/14] iommufd/fault: Add an iommufd_fault_init() helper Nicolin Chen
2025-01-10 17:25 ` Jason Gunthorpe
2025-01-07 17:10 ` [PATCH v5 03/14] iommufd/fault: Move iommufd_fault_iopf_handler() to header Nicolin Chen
2025-01-10 17:25 ` Jason Gunthorpe
2025-01-07 17:10 ` [PATCH v5 04/14] iommufd: Abstract an iommufd_eventq from iommufd_fault Nicolin Chen
2025-01-10 6:26 ` Tian, Kevin
2025-01-10 17:26 ` Jason Gunthorpe
2025-01-10 20:49 ` Nicolin Chen
2025-01-07 17:10 ` [PATCH v5 05/14] iommufd: Rename fault.c to eventq.c Nicolin Chen
2025-01-10 17:27 ` Jason Gunthorpe
2025-01-07 17:10 ` [PATCH v5 06/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC Nicolin Chen
2025-01-10 7:06 ` Tian, Kevin
2025-01-10 21:29 ` Nicolin Chen
2025-01-13 2:52 ` Tian, Kevin
2025-01-13 4:51 ` Nicolin Chen
2025-01-13 8:17 ` Tian, Kevin
2025-01-13 19:10 ` Jason Gunthorpe
2025-01-10 17:48 ` Jason Gunthorpe
2025-01-10 19:27 ` Nicolin Chen
2025-01-10 19:49 ` Jason Gunthorpe
2025-01-10 21:58 ` Nicolin Chen
2025-01-13 19:12 ` Jason Gunthorpe
2025-01-13 19:18 ` Nicolin Chen
2025-01-07 17:10 ` [PATCH v5 07/14] iommufd/viommu: Add iommufd_viommu_get_vdev_id helper Nicolin Chen
2025-01-10 7:07 ` Tian, Kevin
2025-01-10 21:35 ` Nicolin Chen
2025-01-07 17:10 ` [PATCH v5 08/14] iommufd/viommu: Add iommufd_viommu_report_event helper Nicolin Chen
2025-01-10 7:12 ` Tian, Kevin
2025-01-10 14:51 ` Jason Gunthorpe
2025-01-10 18:40 ` Nicolin Chen
2025-01-10 17:41 ` Jason Gunthorpe
2025-01-10 18:38 ` Nicolin Chen
2025-01-10 19:51 ` Jason Gunthorpe
2025-01-10 19:56 ` Nicolin Chen
2025-01-13 5:37 ` Nicolin Chen
2025-01-13 19:21 ` Jason Gunthorpe
2025-01-13 19:47 ` Nicolin Chen
2025-01-13 19:54 ` Jason Gunthorpe
2025-01-13 20:44 ` Nicolin Chen
2025-01-14 13:41 ` Jason Gunthorpe
2025-01-17 22:11 ` Nicolin Chen
2025-01-20 18:18 ` Jason Gunthorpe
2025-01-20 20:52 ` Nicolin Chen
2025-01-21 18:36 ` Jason Gunthorpe
2025-01-21 19:55 ` Nicolin Chen
2025-01-21 20:09 ` Jason Gunthorpe
2025-01-21 21:02 ` Nicolin Chen
2025-01-21 21:14 ` Jason Gunthorpe
2025-01-21 21:40 ` Nicolin Chen
2025-01-22 0:21 ` Jason Gunthorpe
2025-01-22 7:15 ` Nicolin Chen
2025-01-22 9:33 ` Tian, Kevin
2025-01-22 19:54 ` Nicolin Chen
2025-01-23 13:42 ` Jason Gunthorpe
2025-01-22 8:05 ` Nicolin Chen
2025-01-22 18:02 ` Nicolin Chen
2025-01-23 7:02 ` Nicolin Chen
2025-01-23 13:43 ` Jason Gunthorpe [this message]
2025-01-07 17:10 ` [PATCH v5 09/14] iommufd/selftest: Require vdev_id when attaching to a nested domain Nicolin Chen
2025-01-07 17:10 ` [PATCH v5 10/14] iommufd/selftest: Add IOMMU_TEST_OP_TRIGGER_VEVENT for vEVENTQ coverage Nicolin Chen
2025-01-07 17:10 ` [PATCH v5 11/14] iommufd/selftest: Add IOMMU_VEVENTQ_ALLOC test coverage Nicolin Chen
2025-01-07 17:10 ` [PATCH v5 12/14] Documentation: userspace-api: iommufd: Update FAULT and VEVENTQ Nicolin Chen
2025-01-10 7:13 ` Tian, Kevin
2025-01-07 17:10 ` [PATCH v5 13/14] iommu/arm-smmu-v3: Introduce struct arm_smmu_vmaster Nicolin Chen
2025-01-13 19:29 ` Jason Gunthorpe
2025-01-13 19:52 ` Nicolin Chen
2025-01-07 17:10 ` [PATCH v5 14/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU Nicolin Chen
2025-01-09 11:04 ` kernel test robot
2025-01-13 19:01 ` Nicolin Chen
2025-01-13 19:06 ` Jason Gunthorpe
2025-01-13 19:15 ` Nicolin Chen
2025-01-13 19:18 ` Jason Gunthorpe
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