linux-kernel - [RFC v2 6/7] vduse: send update_iotlb

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Message-ID: <20250807115752.1663383-7-eperezma@redhat.com>
Date: Thu,  7 Aug 2025 13:57:51 +0200
From: Eugenio Pérez <eperezma@...hat.com>
To: "Michael S . Tsirkin " <mst@...hat.com>
Cc: Cindy Lu <lulu@...hat.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Yongji Xie <xieyongji@...edance.com>,
	Stefano Garzarella <sgarzare@...hat.com>,
	virtualization@...ts.linux.dev,
	Laurent Vivier <lvivier@...hat.com>,
	linux-kernel@...r.kernel.org,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	jasowang@...hat.com,
	Maxime Coquelin <mcoqueli@...hat.com>
Subject: [RFC v2 6/7] vduse: send update_iotlb_v2 message

This message lets the kernel notify userspace VDUSE backends about
updated IOTLB mappings for a specific ASID.

Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 14 ++++++++++----
 include/uapi/linux/vduse.h         |  7 +++++++
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 145147c49930..ac7897068222 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -326,7 +326,7 @@ static int vduse_dev_set_status(struct vduse_dev *dev, u8 status)
 	return vduse_dev_msg_sync(dev, &msg);
 }
 
-static int vduse_dev_update_iotlb(struct vduse_dev *dev,
+static int vduse_dev_update_iotlb(struct vduse_dev *dev, u32 asid,
 				  u64 start, u64 last)
 {
 	struct vduse_dev_msg msg = { 0 };
@@ -335,8 +335,14 @@ static int vduse_dev_update_iotlb(struct vduse_dev *dev,
 		return -EINVAL;
 
 	msg.req.type = VDUSE_UPDATE_IOTLB;
-	msg.req.iova.start = start;
-	msg.req.iova.last = last;
+	if (dev->api_version < VDUSE_API_VERSION_1) {
+		msg.req.iova.start = start;
+		msg.req.iova.last = last;
+	} else {
+		msg.req.iova_v2.start = start;
+		msg.req.iova_v2.last = last;
+		msg.req.iova_v2.asid = asid;
+	}
 
 	return vduse_dev_msg_sync(dev, &msg);
 }
@@ -882,7 +888,7 @@ static int vduse_vdpa_set_map(struct vdpa_device *vdpa,
 	if (ret)
 		return ret;
 
-	ret = vduse_dev_update_iotlb(dev, 0ULL, ULLONG_MAX);
+	ret = vduse_dev_update_iotlb(dev, asid, 0ULL, ULLONG_MAX);
 	if (ret) {
 		vduse_domain_clear_map(dev->domain[asid], iotlb);
 		return ret;
diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h
index d300fd5f867f..a5f7a5edb8e0 100644
--- a/include/uapi/linux/vduse.h
+++ b/include/uapi/linux/vduse.h
@@ -349,6 +349,12 @@ struct vduse_iova_range {
 	__u64 last;
 };
 
+struct vduse_iova_range_v2 {
+	__u64 start;
+	__u64 last;
+	__u32 asid;
+};
+
 /**
  * struct vduse_dev_request - control request
  * @type: request type
@@ -369,6 +375,7 @@ struct vduse_dev_request {
 		struct vduse_vq_state vq_state;
 		struct vduse_dev_status s;
 		struct vduse_iova_range iova;
+		struct vduse_iova_range_v2 iova_v2;
 		struct vduse_vq_group vq_group; /* Only if vduse api version >= 1 */
 		/* Only if vduse api version >= 1 */
 		struct vduse_vq_group_asid vq_group_asid;
-- 
2.50.1