linux-kernel - Re: [PATCH v1 05/16] iommufd/viommu: Add IOMMU_VIOMMU_SET/UNSET_VDEV

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Message-ID: <20240815234208.GY2032816@nvidia.com>
Date: Thu, 15 Aug 2024 20:42:08 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, will@...nel.org, joro@...tes.org,
	suravee.suthikulpanit@....com, robin.murphy@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, shuah@...nel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v1 05/16] iommufd/viommu: Add
 IOMMU_VIOMMU_SET/UNSET_VDEV_ID ioctl

On Thu, Aug 15, 2024 at 12:53:04PM -0700, Nicolin Chen wrote:

> > Maybe the iommufd_viommu_invalidate ioctl handler should hold that
> > xa_lock around the viommu->ops->cache_invalidate, and then add lock
> > assert in iommufd_viommu_find_device?
> 
> xa_lock/spinlock might be too heavy. We can have a mutex to wrap
> around viommu ioctl handlers..

A rw semaphore might be reasonable.

Jason