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vfio: add a singleton check for vfio_group_pin_pages 

Page pinning is used both to translate and pin device mappings for DMA
purpose, as well as to indicate to the IOMMU backend to limit the dirty
page scope to those pages that have been pinned, in the case of an IOMMU
backed device.
To support this, the vfio_pin_pages() interface limits itself to only
singleton groups such that the IOMMU backend can consider dirty page
scope only at the group level.  Implement the same requirement for the
vfio_group_pin_pages() interface.

Fixes: 95fc87b441 ("vfio: Selective dirty page tracking if IOMMU backed device pins pages")
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yan Zhao 2020-09-16 10:28:33 +08:00 committed by Alex Williamson
parent ba4f184e12
commit 7ef32e5236
1 changed files with 3 additions and 0 deletions
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3
drivers/vfio/vfio.c
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@ -2051,6 +2051,9 @@ int vfio_group_pin_pages(struct vfio_group *group,
if (!group || !user_iova_pfn || !phys_pfn || !npage)
return -EINVAL;
if (group->dev_counter > 1)
return -EINVAL;
if (npage > VFIO_PIN_PAGES_MAX_ENTRIES)
return -E2BIG;