Commit d1087205 authored by Li Zhe's avatar Li Zhe Committed by Alex Williamson
Browse files

vfio/type1: batch vfio_find_vpfn() in function vfio_unpin_pages_remote() 



The function vpfn_pages() can help us determine the number of vpfn
nodes on the vpfn rb tree within a specified range. This allows us
to avoid searching for each vpfn individually in the function
vfio_unpin_pages_remote(). This patch batches the vfio_find_vpfn()
calls in function vfio_unpin_pages_remote().

Signed-off-by: default avatarLi Zhe <lizhe.67@bytedance.com>
Link: https://lore.kernel.org/r/20250814064714.56485-4-lizhe.67@bytedance.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent f6c84a52

drivers/vfio/vfio_iommu_type1.c

+3 −7
Original line number Diff line number Diff line
@@ -802,16 +802,12 @@ static long vfio_unpin_pages_remote(struct vfio_dma *dma, dma_addr_t iova, 
				    unsigned long pfn, unsigned long npage,

				    bool do_accounting)

{

	long unlocked = 0, locked = 0;

	long unlocked = 0, locked = vpfn_pages(dma, iova, npage);

	long i;



	for (i = 0; i < npage; i++, iova += PAGE_SIZE) {

		if (put_pfn(pfn++, dma->prot)) {

	for (i = 0; i < npage; i++)

		if (put_pfn(pfn++, dma->prot))

			unlocked++;

			if (vfio_find_vpfn(dma, iova))

				locked++;

		}

	}



	if (do_accounting)

		vfio_lock_acct(dma, locked - unlocked, true);