qemu-kvm/SOURCES/kvm-virtio-blk-rename-dataplane-create-destroy-functions.patch

118 lines
4.6 KiB
Diff

From 71257c2f320f1511de1e275779cf4b90effc1f02 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Fri, 19 Jan 2024 08:57:44 -0500
Subject: [PATCH 15/22] virtio-blk: rename dataplane create/destroy functions
RH-Author: Stefan Hajnoczi <stefanha@redhat.com>
RH-MergeRequest: 219: virtio-blk: add iothread-vq-mapping parameter
RH-Jira: RHEL-17369 RHEL-20764 RHEL-7356
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Hanna Czenczek <hreitz@redhat.com>
RH-Commit: [11/17] 60e7016d5f3e4e9e89945578279b12f812f85ddf (stefanha/centos-stream-qemu-kvm)
virtio_blk_data_plane_create() and virtio_blk_data_plane_destroy() are
actually about s->vq_aio_context[] rather than managing
dataplane-specific state.
As a prerequisite to using s->vq_aio_context[] in all code paths (even
when dataplane is not used), rename these functions to reflect that they
just manage s->vq_aio_context and call them regardless of whether or not
dataplane is in use.
Note that virtio-blk supports running with -device
virtio-blk-pci,ioevent=off where the vCPU thread enters the device
emulation code. In this mode ioeventfd is not used for virtqueue
processing. However, we still want to initialize s->vq_aio_context[] to
qemu_aio_context in that case since I/O completion callbacks will be
invoked in the main loop thread.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20240119135748.270944-3-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 57bc2658935778d1ae0edbcd4402763da8c7bae2)
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
hw/block/virtio-blk.c | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index cb623069f8..4d6f9377c6 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -1608,7 +1608,7 @@ apply_vq_mapping(IOThreadVirtQueueMappingList *iothread_vq_mapping_list,
IOThread *iothread = iothread_by_id(node->value->iothread);
AioContext *ctx = iothread_get_aio_context(iothread);
- /* Released in virtio_blk_data_plane_destroy() */
+ /* Released in virtio_blk_vq_aio_context_cleanup() */
object_ref(OBJECT(iothread));
if (node->value->vqs) {
@@ -1631,7 +1631,7 @@ apply_vq_mapping(IOThreadVirtQueueMappingList *iothread_vq_mapping_list,
}
/* Context: BQL held */
-static bool virtio_blk_data_plane_create(VirtIOBlock *s, Error **errp)
+static bool virtio_blk_vq_aio_context_init(VirtIOBlock *s, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(s);
VirtIOBlkConf *conf = &s->conf;
@@ -1659,11 +1659,6 @@ static bool virtio_blk_data_plane_create(VirtIOBlock *s, Error **errp)
return false;
}
}
- /* Don't try if transport does not support notifiers. */
- if (!virtio_device_ioeventfd_enabled(vdev)) {
- s->dataplane_disabled = true;
- return false;
- }
s->vq_aio_context = g_new(AioContext *, conf->num_queues);
@@ -1676,7 +1671,7 @@ static bool virtio_blk_data_plane_create(VirtIOBlock *s, Error **errp)
s->vq_aio_context[i] = ctx;
}
- /* Released in virtio_blk_data_plane_destroy() */
+ /* Released in virtio_blk_vq_aio_context_cleanup() */
object_ref(OBJECT(conf->iothread));
} else {
AioContext *ctx = qemu_get_aio_context();
@@ -1689,7 +1684,7 @@ static bool virtio_blk_data_plane_create(VirtIOBlock *s, Error **errp)
}
/* Context: BQL held */
-static void virtio_blk_data_plane_destroy(VirtIOBlock *s)
+static void virtio_blk_vq_aio_context_cleanup(VirtIOBlock *s)
{
VirtIOBlkConf *conf = &s->conf;
@@ -2015,7 +2010,13 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output);
}
qemu_coroutine_inc_pool_size(conf->num_queues * conf->queue_size / 2);
- virtio_blk_data_plane_create(s, &err);
+
+ /* Don't start dataplane if transport does not support notifiers. */
+ if (!virtio_device_ioeventfd_enabled(vdev)) {
+ s->dataplane_disabled = true;
+ }
+
+ virtio_blk_vq_aio_context_init(s, &err);
if (err != NULL) {
error_propagate(errp, err);
for (i = 0; i < conf->num_queues; i++) {
@@ -2052,7 +2053,7 @@ static void virtio_blk_device_unrealize(DeviceState *dev)
blk_drain(s->blk);
del_boot_device_lchs(dev, "/disk@0,0");
- virtio_blk_data_plane_destroy(s);
+ virtio_blk_vq_aio_context_cleanup(s);
for (i = 0; i < conf->num_queues; i++) {
virtio_del_queue(vdev, i);
}
--
2.39.3