From: "Iván Ezequiel Rodriguez" <ivanrwcm25@gmail.com>
To: Jonathan Corbet <corbet@lwn.net>, Bartosz Golaszewski <brgl@kernel.org>
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-gpio@vger.kernel.org, "Mickaël Salaün" <mic@digikod.net>,
"Jason Wang" <jasowangio@gmail.com>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Iván Ezequiel Rodriguez" <ivanrwcm25@gmail.com>
Subject: [PATCH 5/7] docs: vduse: align documentation with current uapi and driver
Date: Mon, 31 Aug 2026 11:31:23 -0300 [thread overview]
Message-ID: <20260831143125.151360-6-ivanrwcm25@gmail.com> (raw)
In-Reply-To: <20260831143125.151360-1-ivanrwcm25@gmail.com>
Update supported device IDs (block, net, fs), all six read/write message
types, the VDUSE_VQ_INJECT_IRQ ioctl name, and VQ_SETUP group vs asid
usage per include/uapi/linux/vduse.h.
Signed-off-by: Iván Ezequiel Rodriguez <ivanrwcm25@gmail.com>
---
Documentation/userspace-api/vduse.rst | 33 +++++++++++++++++----------
1 file changed, 21 insertions(+), 12 deletions(-)
diff --git a/Documentation/userspace-api/vduse.rst b/Documentation/userspace-api/vduse.rst
index 81479d47c8b9..d316857ca5bd 100644
--- a/Documentation/userspace-api/vduse.rst
+++ b/Documentation/userspace-api/vduse.rst
@@ -11,11 +11,10 @@ to make the device emulation more secure, the emulated vDPA device's
control path is handled in the kernel and only the data path is
implemented in the userspace.
-Note that only virtio block device is supported by VDUSE framework now,
-which can reduce security risks when the userspace process that implements
-the data path is run by an unprivileged user. The support for other device
-types can be added after the security issue of corresponding device driver
-is clarified or fixed in the future.
+Note that virtio block, network, and filesystem device types are supported
+by the VDUSE framework. Other device types may be added after the security
+implications of the corresponding device driver are clarified or fixed in
+the future.
Create/Destroy VDUSE devices
----------------------------
@@ -135,7 +134,8 @@ module as follows:
return 0;
}
-There are now three types of messages introduced by VDUSE framework:
+The following control message types may be delivered via read(2) on
+/dev/vduse/$NAME:
- VDUSE_GET_VQ_STATE: Get the state for virtqueue, userspace should return
avail index for split virtqueue or the device/driver ring wrap counters and
@@ -151,6 +151,15 @@ There are now three types of messages introduced by VDUSE framework:
IOVA range, userspace should firstly remove the old mapping, then setup the new
mapping via the VDUSE_IOTLB_GET_FD ioctl.
+- VDUSE_SET_VQ_GROUP_ASID: Notify userspace to change the address space of a
+ virtqueue group (API version 1).
+
+- VDUSE_SET_VQ_READY: Notify userspace that a virtqueue should become ready or
+ not ready (when VDUSE_F_QUEUE_READY is negotiated).
+
+- VDUSE_SUSPEND: Notify userspace that the device is being suspended (when
+ VDUSE_F_SUSPEND is negotiated).
+
After DRIVER_OK status bit is set via the VDUSE_SET_STATUS message, userspace is
able to start the dataplane processing as follows:
@@ -227,7 +236,7 @@ able to start the dataplane processing as follows:
described by the descriptors in the descriptor table should be also mapped into
userspace via the VDUSE_IOTLB_GET_FD ioctl before accessing.
-5. Inject an interrupt for specific virtqueue with the VDUSE_INJECT_VQ_IRQ ioctl
+5. Inject an interrupt for specific virtqueue with the VDUSE_VQ_INJECT_IRQ ioctl
after the used ring is filled.
Enabling ASID (API version 1)
@@ -238,11 +247,11 @@ version 1. Set it up with ioctl(VDUSE_SET_API_VERSION) on `/dev/vduse/control`
and pass `VDUSE_API_VERSION_1` before creating a new VDUSE instance with
ioctl(VDUSE_CREATE_DEV).
-Afterwards, you can use the member asid of ioctl(VDUSE_VQ_SETUP) argument to
-select the address space of the IOTLB you are querying. The driver could
-change the address space of any virtqueue group by using the
-VDUSE_SET_VQ_GROUP_ASID VDUSE message type, and the VDUSE instance needs to
-reply with VDUSE_REQ_RESULT_OK if it was possible to change it.
+Afterwards, ioctl(VDUSE_VQ_SETUP) takes a virtqueue group index in
+struct vduse_vq_config::group. The driver can change the address space
+of any virtqueue group by using the VDUSE_SET_VQ_GROUP_ASID message type,
+and the VDUSE instance needs to reply with VDUSE_REQ_RESULT_OK if it was
+possible to change it.
Similarly, you can use ioctl(VDUSE_IOTLB_GET_FD2) to obtain the file descriptor
describing an IOVA region of a specific ASID. Example usage:
--
2.43.0
next prev parent reply other threads:[~2026-08-31 14:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-31 14:31 [PATCH 0/7] docs/abi: align userspace documentation with implementation Iván Ezequiel Rodriguez
2026-08-31 14:31 ` [PATCH 1/7] docs: futex2: fix documented errno names for futex_waitv Iván Ezequiel Rodriguez
2026-08-31 14:31 ` [PATCH 2/7] docs: landlock: fix ENOMSG condition in create_ruleset kernel-doc Iván Ezequiel Rodriguez
2026-08-31 14:31 ` [PATCH 3/7] docs: gpio: note lineinfo padding must be zero filled Iván Ezequiel Rodriguez
2026-09-01 8:24 ` Bartosz Golaszewski
2026-08-31 14:31 ` [PATCH 4/7] docs: dma-buf-heaps: fix CMA heap name typo Iván Ezequiel Rodriguez
2026-08-31 14:31 ` Iván Ezequiel Rodriguez [this message]
2026-08-31 14:31 ` [PATCH 6/7] docs: ioctl: fix stale NVMe registry entry and note N conflict Iván Ezequiel Rodriguez
2026-08-31 14:31 ` [PATCH 7/7] gpio: cdev: return EOPNOTSUPP when HTE is unavailable Iván Ezequiel Rodriguez
2026-09-01 8:25 ` [PATCH 0/7] docs/abi: align userspace documentation with implementation Bartosz Golaszewski
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