101 lines
3.4 KiB
Diff
101 lines
3.4 KiB
Diff
From f06e65cb747cbd32f4d12f1d880625c14a8bd9da Mon Sep 17 00:00:00 2001
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From: Xueming Li <xuemingl@nvidia.com>
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Date: Mon, 7 Feb 2022 15:19:28 +0800
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Subject: [PATCH 1/2] vhost-user: remove VirtQ notifier restore
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Notifier set when vhost-user backend asks qemu to mmap an FD and
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offset. When vhost-user backend restart or getting killed, VQ notifier
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FD and mmap addresses become invalid. After backend restart, MR contains
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the invalid address will be restored and fail on notifier access.
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On the other hand, qemu should munmap the notifier, release underlying
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hardware resources to enable backend restart and allocate hardware
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notifier resources correctly.
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Qemu shouldn't reference and use resources of disconnected backend.
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This patch removes VQ notifier restore, uses the default vhost-user
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notifier to avoid invalid address access.
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After backend restart, the backend should ask qemu to install a hardware
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notifier if needed.
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Fixes: 44866521bd6e ("vhost-user: support registering external host notifiers")
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Xueming Li <xuemingl@nvidia.com>
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Message-Id: <20220207071929.527149-2-xuemingl@nvidia.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit e867144b73b3c5009266b6df07d5ff44acfb82c3)
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---
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hw/virtio/vhost-user.c | 19 +------------------
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include/hw/virtio/vhost-user.h | 1 -
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2 files changed, 1 insertion(+), 19 deletions(-)
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diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
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index 176cae9244..7b21e09723 100644
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--- a/hw/virtio/vhost-user.c
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+++ b/hw/virtio/vhost-user.c
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@@ -1145,19 +1145,6 @@ static int vhost_user_set_vring_num(struct vhost_dev *dev,
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return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring);
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}
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-static void vhost_user_host_notifier_restore(struct vhost_dev *dev,
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- int queue_idx)
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-{
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- struct vhost_user *u = dev->opaque;
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- VhostUserHostNotifier *n = &u->user->notifier[queue_idx];
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- VirtIODevice *vdev = dev->vdev;
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-
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- if (n->addr && !n->set) {
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- virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, true);
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- n->set = true;
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- }
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-}
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-
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static void vhost_user_host_notifier_remove(struct vhost_dev *dev,
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int queue_idx)
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{
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@@ -1165,17 +1152,14 @@ static void vhost_user_host_notifier_remove(struct vhost_dev *dev,
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VhostUserHostNotifier *n = &u->user->notifier[queue_idx];
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VirtIODevice *vdev = dev->vdev;
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- if (n->addr && n->set) {
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+ if (n->addr) {
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virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, false);
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- n->set = false;
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}
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}
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static int vhost_user_set_vring_base(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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- vhost_user_host_notifier_restore(dev, ring->index);
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-
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return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring);
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}
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@@ -1540,7 +1524,6 @@ static int vhost_user_slave_handle_vring_host_notifier(struct vhost_dev *dev,
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}
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n->addr = addr;
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- n->set = true;
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return 0;
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}
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diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h
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index a9abca3288..f6012b2078 100644
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--- a/include/hw/virtio/vhost-user.h
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+++ b/include/hw/virtio/vhost-user.h
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@@ -14,7 +14,6 @@
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typedef struct VhostUserHostNotifier {
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MemoryRegion mr;
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void *addr;
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- bool set;
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} VhostUserHostNotifier;
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typedef struct VhostUserState {
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--
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2.27.0
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