linux-kernel - [RFC PATCH 1/6] vdpa: add bind

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Date:   Wed, 14 Dec 2022 17:30:20 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     Jason Wang <jasowang@...hat.com>,
        Andrey Zhadchenko <andrey.zhadchenko@...tuozzo.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, eperezma@...hat.com,
        stefanha@...hat.com, netdev@...r.kernel.org,
        Stefano Garzarella <sgarzare@...hat.com>
Subject: [RFC PATCH 1/6] vdpa: add bind_mm callback

This new optional callback is used to bind the device to a specific
address space so the vDPA framework can use VA when this callback
is implemented.

Suggested-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 include/linux/vdpa.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 6d0f5e4e82c2..34388e21ef3f 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -282,6 +282,12 @@ struct vdpa_map_file {
  *				@iova: iova to be unmapped
  *				@size: size of the area
  *				Returns integer: success (0) or error (< 0)
+ * @bind_mm:			Bind the device to a specific address space
+ *				so the vDPA framework can use VA when this
+ *				callback is implemented. (optional)
+ *				@vdev: vdpa device
+ *				@mm: address space to bind
+ *				@owner: process that owns the address space
  * @free:			Free resources that belongs to vDPA (optional)
  *				@vdev: vdpa device
  */
@@ -341,6 +347,8 @@ struct vdpa_config_ops {
 			 u64 iova, u64 size);
 	int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
 			      unsigned int asid);
+	int (*bind_mm)(struct vdpa_device *vdev, struct mm_struct *mm,
+		       struct task_struct *owner);
 
 	/* Free device resources */
 	void (*free)(struct vdpa_device *vdev);
-- 
2.38.1