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From: Peter Xu <peterx@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, jgg@nvidia.com
Subject: Re: [PATCH 2/7] vfio: Export unmap_mapping_range() wrapper
Date: Tue, 10 Aug 2021 14:56:07 -0400	[thread overview]
Message-ID: <YRLLx5O6gleDqsMR@t490s> (raw)
In-Reply-To: <162818324222.1511194.15934590640437021149.stgit@omen>

On Thu, Aug 05, 2021 at 11:07:22AM -0600, Alex Williamson wrote:
> +void vfio_device_unmap_mapping_range(struct vfio_device *device,
> +				     loff_t start, loff_t len)
> +{
> +	unmap_mapping_range(device->inode->i_mapping, start, len, true);

(not a big deal, but still raise this up)

It seems to me VFIO MMIO regions do not allow private maps, so even_cow==true
should be the same with even_cow==false. even_cow==true will just check the
page mapping for each pte even though they should just all match, imho, so
logically "false" should work the same and should be tiny-little faster.

Thanks,

> +}
> +EXPORT_SYMBOL_GPL(vfio_device_unmap_mapping_range);

-- 
Peter Xu


  parent reply	other threads:[~2021-08-10 18:56 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 [this message]
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
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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