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* Mon Jun 13 2022 Miroslav Rezanina <mrezanin@redhat.com> - 7.0.0-6 - kvm-Introduce-event-loop-base-abstract-class.patch [bz#2031024] - kvm-util-main-loop-Introduce-the-main-loop-into-QOM.patch [bz#2031024] - kvm-util-event-loop-base-Introduce-options-to-set-the-th.patch [bz#2031024] - kvm-qcow2-Improve-refcount-structure-rebuilding.patch [bz#2072379] - kvm-iotests-108-Test-new-refcount-rebuild-algorithm.patch [bz#2072379] - kvm-qcow2-Add-errp-to-rebuild_refcount_structure.patch [bz#2072379] - kvm-iotests-108-Fix-when-missing-user_allow_other.patch [bz#2072379] - kvm-virtio-net-setup-vhost_dev-and-notifiers-for-cvq-onl.patch [bz#2070804] - kvm-virtio-net-align-ctrl_vq-index-for-non-mq-guest-for-.patch [bz#2070804] - kvm-vhost-vdpa-fix-improper-cleanup-in-net_init_vhost_vd.patch [bz#2070804] - kvm-vhost-net-fix-improper-cleanup-in-vhost_net_start.patch [bz#2070804] - kvm-vhost-vdpa-backend-feature-should-set-only-once.patch [bz#2070804] - kvm-vhost-vdpa-change-name-and-polarity-for-vhost_vdpa_o.patch [bz#2070804] - kvm-virtio-net-don-t-handle-mq-request-in-userspace-hand.patch [bz#2070804] - kvm-Revert-globally-limit-the-maximum-number-of-CPUs.patch [bz#2094270] - kvm-vfio-common-remove-spurious-warning-on-vfio_listener.patch [bz#2086262] - Resolves: bz#2031024 (Add support for fixing thread pool size [QEMU]) - Resolves: bz#2072379 (Fail to rebuild the reference count tables of qcow2 image on host block devices (e.g. LVs)) - Resolves: bz#2070804 (PXE boot crash qemu when using multiqueue vDPA) - Resolves: bz#2094270 (Do not set the hard vCPU limit to the soft vCPU limit in downstream qemu-kvm anymore) - Resolves: bz#2086262 ([Win11][tpm]vfio_listener_region_del received unaligned region)
2022-06-13 04:34:04 +00:00
From 521a1953bc11ab6823dcbbee773bcf86e926a9e7 Mon Sep 17 00:00:00 2001
From: Si-Wei Liu <si-wei.liu@oracle.com>
Date: Fri, 6 May 2022 19:28:18 -0700
Subject: [PATCH 14/16] virtio-net: don't handle mq request in userspace
handler for vhost-vdpa
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Jason Wang <jasowang@redhat.com>
RH-MergeRequest: 98: Multiqueue fixes for vhost-vDPA
RH-Commit: [7/7] 9781cab45448ae16a00fbf10cf7995df6b984a0a (jasowang/qemu-kvm-cs)
RH-Bugzilla: 2070804
RH-Acked-by: Eugenio Pérez <eperezma@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
virtio_queue_host_notifier_read() tends to read pending event
left behind on ioeventfd in the vhost_net_stop() path, and
attempts to handle outstanding kicks from userspace vq handler.
However, in the ctrl_vq handler, virtio_net_handle_mq() has a
recursive call into virtio_net_set_status(), which may lead to
segmentation fault as shown in below stack trace:
0 0x000055f800df1780 in qdev_get_parent_bus (dev=0x0) at ../hw/core/qdev.c:376
1 0x000055f800c68ad8 in virtio_bus_device_iommu_enabled (vdev=vdev@entry=0x0) at ../hw/virtio/virtio-bus.c:331
2 0x000055f800d70d7f in vhost_memory_unmap (dev=<optimized out>) at ../hw/virtio/vhost.c:318
3 0x000055f800d70d7f in vhost_memory_unmap (dev=<optimized out>, buffer=0x7fc19bec5240, len=2052, is_write=1, access_len=2052) at ../hw/virtio/vhost.c:336
4 0x000055f800d71867 in vhost_virtqueue_stop (dev=dev@entry=0x55f8037ccc30, vdev=vdev@entry=0x55f8044ec590, vq=0x55f8037cceb0, idx=0) at ../hw/virtio/vhost.c:1241
5 0x000055f800d7406c in vhost_dev_stop (hdev=hdev@entry=0x55f8037ccc30, vdev=vdev@entry=0x55f8044ec590) at ../hw/virtio/vhost.c:1839
6 0x000055f800bf00a7 in vhost_net_stop_one (net=0x55f8037ccc30, dev=0x55f8044ec590) at ../hw/net/vhost_net.c:315
7 0x000055f800bf0678 in vhost_net_stop (dev=dev@entry=0x55f8044ec590, ncs=0x55f80452bae0, data_queue_pairs=data_queue_pairs@entry=7, cvq=cvq@entry=1)
at ../hw/net/vhost_net.c:423
8 0x000055f800d4e628 in virtio_net_set_status (status=<optimized out>, n=0x55f8044ec590) at ../hw/net/virtio-net.c:296
9 0x000055f800d4e628 in virtio_net_set_status (vdev=vdev@entry=0x55f8044ec590, status=15 '\017') at ../hw/net/virtio-net.c:370
10 0x000055f800d534d8 in virtio_net_handle_ctrl (iov_cnt=<optimized out>, iov=<optimized out>, cmd=0 '\000', n=0x55f8044ec590) at ../hw/net/virtio-net.c:1408
11 0x000055f800d534d8 in virtio_net_handle_ctrl (vdev=0x55f8044ec590, vq=0x7fc1a7e888d0) at ../hw/net/virtio-net.c:1452
12 0x000055f800d69f37 in virtio_queue_host_notifier_read (vq=0x7fc1a7e888d0) at ../hw/virtio/virtio.c:2331
13 0x000055f800d69f37 in virtio_queue_host_notifier_read (n=n@entry=0x7fc1a7e8894c) at ../hw/virtio/virtio.c:3575
14 0x000055f800c688e6 in virtio_bus_cleanup_host_notifier (bus=<optimized out>, n=n@entry=14) at ../hw/virtio/virtio-bus.c:312
15 0x000055f800d73106 in vhost_dev_disable_notifiers (hdev=hdev@entry=0x55f8035b51b0, vdev=vdev@entry=0x55f8044ec590)
at ../../../include/hw/virtio/virtio-bus.h:35
16 0x000055f800bf00b2 in vhost_net_stop_one (net=0x55f8035b51b0, dev=0x55f8044ec590) at ../hw/net/vhost_net.c:316
17 0x000055f800bf0678 in vhost_net_stop (dev=dev@entry=0x55f8044ec590, ncs=0x55f80452bae0, data_queue_pairs=data_queue_pairs@entry=7, cvq=cvq@entry=1)
at ../hw/net/vhost_net.c:423
18 0x000055f800d4e628 in virtio_net_set_status (status=<optimized out>, n=0x55f8044ec590) at ../hw/net/virtio-net.c:296
19 0x000055f800d4e628 in virtio_net_set_status (vdev=0x55f8044ec590, status=15 '\017') at ../hw/net/virtio-net.c:370
20 0x000055f800d6c4b2 in virtio_set_status (vdev=0x55f8044ec590, val=<optimized out>) at ../hw/virtio/virtio.c:1945
21 0x000055f800d11d9d in vm_state_notify (running=running@entry=false, state=state@entry=RUN_STATE_SHUTDOWN) at ../softmmu/runstate.c:333
22 0x000055f800d04e7a in do_vm_stop (state=state@entry=RUN_STATE_SHUTDOWN, send_stop=send_stop@entry=false) at ../softmmu/cpus.c:262
23 0x000055f800d04e99 in vm_shutdown () at ../softmmu/cpus.c:280
24 0x000055f800d126af in qemu_cleanup () at ../softmmu/runstate.c:812
25 0x000055f800ad5b13 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at ../softmmu/main.c:51
For now, temporarily disable handling MQ request from the ctrl_vq
userspace hanlder to avoid the recursive virtio_net_set_status()
call. Some rework is needed to allow changing the number of
queues without going through a full virtio_net_set_status cycle,
particularly for vhost-vdpa backend.
This patch will need to be reverted as soon as future patches of
having the change of #queues handled in userspace is merged.
Fixes: 402378407db ("vhost-vdpa: multiqueue support")
Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <1651890498-24478-8-git-send-email-si-wei.liu@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 2a7888cc3aa31faee839fa5dddad354ff8941f4c)
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
hw/net/virtio-net.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index f0bb29c741..099e65036d 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1381,6 +1381,7 @@ static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
uint16_t queue_pairs;
+ NetClientState *nc = qemu_get_queue(n->nic);
virtio_net_disable_rss(n);
if (cmd == VIRTIO_NET_CTRL_MQ_HASH_CONFIG) {
@@ -1412,6 +1413,18 @@ static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
return VIRTIO_NET_ERR;
}
+ /* Avoid changing the number of queue_pairs for vdpa device in
+ * userspace handler. A future fix is needed to handle the mq
+ * change in userspace handler with vhost-vdpa. Let's disable
+ * the mq handling from userspace for now and only allow get
+ * done through the kernel. Ripples may be seen when falling
+ * back to userspace, but without doing it qemu process would
+ * crash on a recursive entry to virtio_net_set_status().
+ */
+ if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
+ return VIRTIO_NET_ERR;
+ }
+
n->curr_queue_pairs = queue_pairs;
/* stop the backend before changing the number of queue_pairs to avoid handling a
* disabled queue */
--
2.31.1