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[PATCH v3 for 9.1 1/6] virtio/virtio-pci: Handle extra notification data
From: |
Jonah Palmer |
Subject: |
[PATCH v3 for 9.1 1/6] virtio/virtio-pci: Handle extra notification data |
Date: |
Fri, 15 Mar 2024 12:55:52 -0400 |
Add support to virtio-pci devices for handling the extra data sent
from the driver to the device when the VIRTIO_F_NOTIFICATION_DATA
transport feature has been negotiated.
The extra data that's passed to the virtio-pci device when this
feature is enabled varies depending on the device's virtqueue
layout.
In a split virtqueue layout, this data includes:
- upper 16 bits: shadow_avail_idx
- lower 16 bits: virtqueue index
In a packed virtqueue layout, this data includes:
- upper 16 bits: 1-bit wrap counter & 15-bit shadow_avail_idx
- lower 16 bits: virtqueue index
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
---
hw/virtio/virtio-pci.c | 11 ++++++++---
hw/virtio/virtio.c | 18 ++++++++++++++++++
include/hw/virtio/virtio.h | 2 ++
3 files changed, 28 insertions(+), 3 deletions(-)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index cb6940fc0e..f3e0a08f53 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -384,7 +384,7 @@ static void virtio_ioport_write(void *opaque, uint32_t
addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
- uint16_t vector;
+ uint16_t vector, vq_idx;
hwaddr pa;
switch (addr) {
@@ -408,8 +408,13 @@ static void virtio_ioport_write(void *opaque, uint32_t
addr, uint32_t val)
vdev->queue_sel = val;
break;
case VIRTIO_PCI_QUEUE_NOTIFY:
- if (val < VIRTIO_QUEUE_MAX) {
- virtio_queue_notify(vdev, val);
+ vq_idx = val;
+ if (vq_idx < VIRTIO_QUEUE_MAX && virtio_queue_get_num(vdev, vq_idx)) {
+ if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
+ virtio_queue_set_shadow_avail_idx(virtio_get_queue(vdev,
vq_idx),
+ val >> 16);
+ }
+ virtio_queue_notify(vdev, vq_idx);
}
break;
case VIRTIO_PCI_STATUS:
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index d229755eae..463426ca92 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2255,6 +2255,24 @@ void virtio_queue_set_align(VirtIODevice *vdev, int n,
int align)
}
}
+void virtio_queue_set_shadow_avail_idx(VirtQueue *vq, uint16_t
shadow_avail_idx)
+{
+ if (!vq->vring.desc) {
+ return;
+ }
+
+ /*
+ * 16-bit data for packed VQs include 1-bit wrap counter and
+ * 15-bit shadow_avail_idx.
+ */
+ if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) {
+ vq->shadow_avail_wrap_counter = (shadow_avail_idx >> 15) & 0x1;
+ vq->shadow_avail_idx = shadow_avail_idx & 0x7FFF;
+ } else {
+ vq->shadow_avail_idx = shadow_avail_idx;
+ }
+}
+
static void virtio_queue_notify_vq(VirtQueue *vq)
{
if (vq->vring.desc && vq->handle_output) {
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index c8f72850bc..cdd4f86b61 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -306,6 +306,8 @@ int virtio_queue_ready(VirtQueue *vq);
int virtio_queue_empty(VirtQueue *vq);
+void virtio_queue_set_shadow_avail_idx(VirtQueue *vq, uint16_t idx);
+
/* Host binding interface. */
uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
--
2.39.3
- [PATCH v3 for 9.1 0/6] virtio, vhost: Add VIRTIO_F_NOTIFICATION_DATA support, Jonah Palmer, 2024/03/15
- [PATCH v3 for 9.1 3/6] virtio-mmio: Handle extra notification data, Jonah Palmer, 2024/03/15
- [PATCH v3 for 9.1 2/6] virtio: Prevent creation of device using notification-data with ioeventfd, Jonah Palmer, 2024/03/15
- [PATCH v3 for 9.1 4/6] virtio-ccw: Handle extra notification data, Jonah Palmer, 2024/03/15
- [PATCH v3 for 9.1 5/6] vhost/vhost-user: Add VIRTIO_F_NOTIFICATION_DATA to vhost feature bits, Jonah Palmer, 2024/03/15
- [PATCH v3 for 9.1 6/6] virtio: Add VIRTIO_F_NOTIFICATION_DATA property definition, Jonah Palmer, 2024/03/15
- [PATCH v3 for 9.1 1/6] virtio/virtio-pci: Handle extra notification data,
Jonah Palmer <=
- Re: [PATCH v3 for 9.1 0/6] virtio, vhost: Add VIRTIO_F_NOTIFICATION_DATA support, Jiri Pirko, 2024/03/16