From: Jason Gunthorpe <jgg@nvidia.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, peterx@redhat.com
Subject: Re: [PATCH 3/7] vfio/pci: Use vfio_device_unmap_mapping_range()
Date: Thu, 5 Aug 2021 22:04:18 -0300 [thread overview]
Message-ID: <20210806010418.GF1672295@nvidia.com> (raw)
In-Reply-To: <162818325518.1511194.1243290800645603609.stgit@omen>
On Thu, Aug 05, 2021 at 11:07:35AM -0600, Alex Williamson wrote:
> @@ -2281,15 +2143,13 @@ static int vfio_pci_try_zap_and_vma_lock_cb(struct pci_dev *pdev, void *data)
>
> vdev = container_of(device, struct vfio_pci_device, vdev);
>
> - /*
> - * Locking multiple devices is prone to deadlock, runaway and
> - * unwind if we hit contention.
> - */
> - if (!vfio_pci_zap_and_vma_lock(vdev, true)) {
> + if (!down_write_trylock(&vdev->memory_lock)) {
> vfio_device_put(device);
> return -EBUSY;
> }
Now that this is simplified so much, I wonder if we can drop the
memory_lock and just use the dev_set->lock?
That avoids the whole down_write_trylock thing and makes it much more
understandable?
Jason
next prev parent reply other threads:[~2021-08-06 1:04 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-05 17:06 [PATCH 0/7] vfio: device fd address space and vfio-pci mmap invalidation cleanup Alex Williamson
2021-08-05 17:07 ` [PATCH 1/7] vfio: Create vfio_fs_type with inode per device Alex Williamson
2021-08-10 8:43 ` Christoph Hellwig
2021-08-10 14:52 ` Alex Williamson
2021-08-10 14:57 ` Christoph Hellwig
2021-08-10 18:49 ` Peter Xu
2021-08-10 21:16 ` Alex Williamson
2021-08-10 22:18 ` Peter Xu
2021-08-05 17:07 ` [PATCH 2/7] vfio: Export unmap_mapping_range() wrapper Alex Williamson
2021-08-10 8:45 ` Christoph Hellwig
2021-08-10 18:56 ` Peter Xu
2021-08-05 17:07 ` [PATCH 3/7] vfio/pci: Use vfio_device_unmap_mapping_range() Alex Williamson
2021-08-06 1:04 ` Jason Gunthorpe [this message]
2021-08-06 20:17 ` Alex Williamson
2021-08-10 8:51 ` Christoph Hellwig
2021-08-10 11:57 ` Jason Gunthorpe
2021-08-10 12:55 ` Christoph Hellwig
2021-08-10 21:50 ` Alex Williamson
2021-08-11 11:57 ` Jason Gunthorpe
2021-08-10 8:53 ` Christoph Hellwig
2021-08-10 19:02 ` Peter Xu
2021-08-10 20:51 ` Alex Williamson
2021-08-10 18:48 ` Peter Xu
2021-08-10 19:59 ` Alex Williamson
2021-08-10 20:20 ` Peter Xu
2021-08-05 17:07 ` [PATCH 4/7] vfio,vfio-pci: Add vma to pfn callback Alex Williamson
2021-08-06 1:01 ` Jason Gunthorpe
2021-08-10 9:00 ` Christoph Hellwig
2021-08-10 9:00 ` Christoph Hellwig
2021-08-05 17:08 ` [PATCH 5/7] mm/interval_tree.c: Export vma interval tree iterators Alex Williamson
2021-08-05 17:08 ` [PATCH 6/7] vfio: Add vfio_device_io_remap_mapping_range() Alex Williamson
2021-08-10 9:04 ` Christoph Hellwig
2021-08-05 17:08 ` [PATCH 7/7] vfio/pci: Remove map-on-fault behavior Alex Williamson
2021-08-10 9:11 ` Christoph Hellwig
2021-08-10 15:04 ` Alex Williamson
2021-08-10 20:54 ` Peter Xu
2021-08-10 21:45 ` Alex Williamson
2021-08-10 22:27 ` Peter Xu
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