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vfio/type1: fix dirty bitmap calculation in vfio_dma_rw 

The count of dirtied pages is not only determined by count of copied
pages, but also by the start offset.

e.g. if offset = PAGE_SIZE - 1, and *copied=2, the dirty pages count
is 2, instead of 1 or 0.

Fixes: d6a4c18566 ("vfio iommu: Implementation of ioctl for dirty pages tracking")
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 10:30:05 +08:00 committed by Alex Williamson
parent 28b1302440
commit 2c5af98592
1 changed files with 2 additions and 1 deletions
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3
drivers/vfio/vfio_iommu_type1.c
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@ -2933,7 +2933,8 @@ static int vfio_iommu_type1_dma_rw_chunk(struct vfio_iommu *iommu,
* size
*/
bitmap_set(dma->bitmap, offset >> pgshift,
*copied >> pgshift);
((offset + *copied - 1) >> pgshift) -
(offset >> pgshift) + 1);
}
} else
*copied = copy_from_user(data, (void __user *)vaddr,