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vfio/type1: Prepare for batched pinning with struct vfio_batch
Get ready to pin more pages at once with struct vfio_batch, which represents a batch of pinned pages. The struct has a fallback page pointer to avoid two unlikely scenarios: pointlessly allocating a page if disable_hugepages is enabled or failing the whole pinning operation if the kernel can't allocate memory. vaddr_get_pfn() becomes vaddr_get_pfns() to prepare for handling multiple pages, though for now only one page is stored in the pages array. Signed-off-by: Daniel Jordan <[email protected]> Signed-off-by: Alex Williamson <[email protected]>
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