Re: [PATCH v5 08/14] iommufd/viommu: Add iommufd_viommu_report_event helper
From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2025-01-23 13:43:46
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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