[RFC PATCH 02/19] drivers/vhost: Convert to use vm_account

[Alistair Popple <apopple@xxxxxxxxxx>]

Convert vhost to use the new vm_account structure and associated
account_pinned_vm() functions.

Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 drivers/vhost/vdpa.c  |  9 +++++----
 drivers/vhost/vhost.c |  2 ++
 drivers/vhost/vhost.h |  1 +
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index ec32f78..a31dd53 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -716,7 +716,7 @@ static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
 				set_page_dirty_lock(page);
 			unpin_user_page(page);
 		}
-		atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm);
+		vm_unaccount_pinned(&dev->vm_account, PFN_DOWN(map->size));
 		vhost_vdpa_general_unmap(v, map, asid);
 		vhost_iotlb_map_free(iotlb, map);
 	}
@@ -780,6 +780,10 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
 	u32 asid = iotlb_to_asid(iotlb);
 	int r = 0;
 
+	if (!vdpa->use_va)
+		if (vm_account_pinned(&dev->vm_account, PFN_DOWN(size)))
+			return -ENOMEM;
+
 	r = vhost_iotlb_add_range_ctx(iotlb, iova, iova + size - 1,
 				      pa, perm, opaque);
 	if (r)
@@ -799,9 +803,6 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
 		return r;
 	}
 
-	if (!vdpa->use_va)
-		atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm);
-
 	return 0;
 }
 
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index cbe72bf..5645c26 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -556,6 +556,7 @@ static void vhost_attach_mm(struct vhost_dev *dev)
 		dev->mm = current->mm;
 		mmgrab(dev->mm);
 	}
+	vm_account_init_current(&dev->vm_account);
 }
 
 static void vhost_detach_mm(struct vhost_dev *dev)
@@ -569,6 +570,7 @@ static void vhost_detach_mm(struct vhost_dev *dev)
 		mmdrop(dev->mm);
 
 	dev->mm = NULL;
+	vm_account_release(&dev->vm_account);
 }
 
 /* Caller should have device mutex */
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index d910910..3a9aed8 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -144,6 +144,7 @@ struct vhost_msg_node {
 struct vhost_dev {
 	struct mm_struct *mm;
 	struct mutex mutex;
+	struct vm_account vm_account;
 	struct vhost_virtqueue **vqs;
 	int nvqs;
 	struct eventfd_ctx *log_ctx;
-- 
git-series 0.9.1