linux-kernel - [RFC V1 01/13] vhost-vdpa: count pinned memory

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Date: Wed, 10 Jan 2024 12:40:03 -0800
From: Steve Sistare <steven.sistare@...cle.com>
To: virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Eugenio Perez Martin <eperezma@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Dragos Tatulea <dtatulea@...dia.com>, Eli Cohen <elic@...dia.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Steve Sistare <steven.sistare@...cle.com>
Subject: [RFC V1 01/13] vhost-vdpa: count pinned memory

Remember the count of pinned memory for the device.

Signed-off-by: Steve Sistare <steven.sistare@...cle.com>
---
 drivers/vhost/vdpa.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index da7ec77cdaff..10fb95bcca1a 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -59,6 +59,7 @@ struct vhost_vdpa {
 	int in_batch;
 	struct vdpa_iova_range range;
 	u32 batch_asid;
+	long pinned_vm;
 };
 
 static DEFINE_IDA(vhost_vdpa_ida);
@@ -893,6 +894,7 @@ static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
 			unpin_user_page(page);
 		}
 		atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm);
+		v->pinned_vm -= PFN_DOWN(map->size);
 		vhost_vdpa_general_unmap(v, map, asid);
 		vhost_iotlb_map_free(iotlb, map);
 	}
@@ -975,9 +977,10 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
 		return r;
 	}
 
-	if (!vdpa->use_va)
+	if (!vdpa->use_va) {
 		atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm);
-
+		v->pinned_vm += PFN_DOWN(size);
+	}
 	return 0;
 }
 
-- 
2.39.3