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From 6cde15c70c86819033337771eb522e94e3ea9e34 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
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Date: Tue, 23 Aug 2022 20:20:07 +0200
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Subject: [PATCH 09/23] vhost: Always store new kick fd on
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vhost_svq_set_svq_kick_fd
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eugenio Pérez <eperezma@redhat.com>
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RH-MergeRequest: 116: vdpa: Restore device state on destination
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RH-Bugzilla: 2114060
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [8/21] a09b8851c39d7cea67414560f6d322e988b9d59a (eperezmartin/qemu-kvm)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2114060
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Upstream status: git@github.com:jasowang/qemu.git net-next
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We can unbind twice a file descriptor if we call twice
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vhost_svq_set_svq_kick_fd because of this. Since it comes from vhost and
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not from SVQ, that file descriptor could be a different thing that
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guest's vhost notifier.
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Likewise, it can happens the same if a guest start and stop the device
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multiple times.
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Reported-by: Lei Yang <leiyang@redhat.com>
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Fixes: dff4426fa6 ("vhost: Add Shadow VirtQueue kick forwarding capabilities")
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit 6867f29c1425add7e0e8d1d8d58cc0ffbb8df0e4)
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---
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hw/virtio/vhost-shadow-virtqueue.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c
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index e53aac45f6..f420311b89 100644
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--- a/hw/virtio/vhost-shadow-virtqueue.c
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+++ b/hw/virtio/vhost-shadow-virtqueue.c
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@@ -602,13 +602,13 @@ void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd)
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event_notifier_set_handler(svq_kick, NULL);
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}
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+ event_notifier_init_fd(svq_kick, svq_kick_fd);
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/*
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* event_notifier_set_handler already checks for guest's notifications if
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* they arrive at the new file descriptor in the switch, so there is no
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* need to explicitly check for them.
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*/
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if (poll_start) {
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- event_notifier_init_fd(svq_kick, svq_kick_fd);
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event_notifier_set(svq_kick);
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event_notifier_set_handler(svq_kick, vhost_handle_guest_kick_notifier);
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}
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@@ -655,7 +655,7 @@ void vhost_svq_start(VhostShadowVirtqueue *svq, VirtIODevice *vdev,
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*/
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void vhost_svq_stop(VhostShadowVirtqueue *svq)
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{
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- event_notifier_set_handler(&svq->svq_kick, NULL);
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+ vhost_svq_set_svq_kick_fd(svq, VHOST_FILE_UNBIND);
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g_autofree VirtQueueElement *next_avail_elem = NULL;
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if (!svq->vq) {
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--
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2.31.1
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