Patch "vdpa: Make use of PFN_PHYS/PFN_UP/PFN_DOWN helper macro" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    vdpa: Make use of PFN_PHYS/PFN_UP/PFN_DOWN helper macro

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vdpa-make-use-of-pfn_phys-pfn_up-pfn_down-helper-mac.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e5e838cc00a8facc70cd18f2ba84495c3ebf81e2
Author: Cai Huoqing <cai.huoqing@xxxxxxxxx>
Date:   Mon Aug 2 09:37:17 2021 +0800

    vdpa: Make use of PFN_PHYS/PFN_UP/PFN_DOWN helper macro
    
    [ Upstream commit 729ce5a5bd6fda5eb2322a39db2287f1f26f92f3 ]
    
    it's a nice refactor to make use of
    PFN_PHYS/PFN_UP/PFN_DOWN helper macro
    
    Signed-off-by: Cai Huoqing <caihuoqing@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20210802013717.851-1-caihuoqing@xxxxxxxxx
    Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
    Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    Stable-dep-of: 0823dc64586b ("vhost-vdpa: switch to use vmf_insert_pfn() in the fault handler")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 04578aa87e4da..f48047a1027a2 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -519,15 +519,15 @@ static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last)
 	unsigned long pfn, pinned;
 
 	while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
-		pinned = map->size >> PAGE_SHIFT;
-		for (pfn = map->addr >> PAGE_SHIFT;
+		pinned = PFN_DOWN(map->size);
+		for (pfn = PFN_DOWN(map->addr);
 		     pinned > 0; pfn++, pinned--) {
 			page = pfn_to_page(pfn);
 			if (map->perm & VHOST_ACCESS_WO)
 				set_page_dirty_lock(page);
 			unpin_user_page(page);
 		}
-		atomic64_sub(map->size >> PAGE_SHIFT, &dev->mm->pinned_vm);
+		atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm);
 		vhost_iotlb_map_free(iotlb, map);
 	}
 }
@@ -589,7 +589,7 @@ static int vhost_vdpa_map(struct vhost_vdpa *v,
 	if (r)
 		vhost_iotlb_del_range(dev->iotlb, iova, iova + size - 1);
 	else
-		atomic64_add(size >> PAGE_SHIFT, &dev->mm->pinned_vm);
+		atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm);
 
 	return r;
 }
@@ -643,7 +643,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
 	if (msg->perm & VHOST_ACCESS_WO)
 		gup_flags |= FOLL_WRITE;
 
-	npages = PAGE_ALIGN(msg->size + (iova & ~PAGE_MASK)) >> PAGE_SHIFT;
+	npages = PFN_UP(msg->size + (iova & ~PAGE_MASK));
 	if (!npages) {
 		ret = -EINVAL;
 		goto free;
@@ -651,7 +651,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
 
 	mmap_read_lock(dev->mm);
 
-	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+	lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK));
 	if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) {
 		ret = -ENOMEM;
 		goto unlock;
@@ -685,9 +685,9 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
 
 			if (last_pfn && (this_pfn != last_pfn + 1)) {
 				/* Pin a contiguous chunk of memory */
-				csize = (last_pfn - map_pfn + 1) << PAGE_SHIFT;
+				csize = PFN_PHYS(last_pfn - map_pfn + 1);
 				ret = vhost_vdpa_map(v, iova, csize,
-						     map_pfn << PAGE_SHIFT,
+						     PFN_PHYS(map_pfn),
 						     msg->perm);
 				if (ret) {
 					/*
@@ -711,13 +711,13 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
 			last_pfn = this_pfn;
 		}
 
-		cur_base += pinned << PAGE_SHIFT;
+		cur_base += PFN_PHYS(pinned);
 		npages -= pinned;
 	}
 
 	/* Pin the rest chunk */
-	ret = vhost_vdpa_map(v, iova, (last_pfn - map_pfn + 1) << PAGE_SHIFT,
-			     map_pfn << PAGE_SHIFT, msg->perm);
+	ret = vhost_vdpa_map(v, iova, PFN_PHYS(last_pfn - map_pfn + 1),
+			     PFN_PHYS(map_pfn), msg->perm);
 out:
 	if (ret) {
 		if (nchunks) {
@@ -961,7 +961,7 @@ static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf)
 
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 	if (remap_pfn_range(vma, vmf->address & PAGE_MASK,
-			    notify.addr >> PAGE_SHIFT, PAGE_SIZE,
+			    PFN_DOWN(notify.addr), PAGE_SIZE,
 			    vma->vm_page_prot))
 		return VM_FAULT_SIGBUS;