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: Li Zhe <lizhe.67@bytedance.com>
Link: https://lore.kernel.org/r/20250814064714.56485-4-lizhe.67@bytedance.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

Author: Li Zhe

drivers/vfio/vfio_iommu_type1.c

@@ -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);