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From 257d8d98076717288519d312f1690c453bb74776 Mon Sep 17 00:00:00 2001
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From: Maxime Coquelin <maxime.coquelin@redhat.com>
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Date: Tue, 5 Dec 2017 09:28:38 +0100
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Subject: [PATCH 16/21] virtio: Add queue interface to restore avail index from
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vring used index
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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: Maxime Coquelin <maxime.coquelin@redhat.com>
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Message-id: <20171205092839.17597-2-maxime.coquelin@redhat.com>
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Patchwork-id: 78140
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH 1/2] virtio: Add queue interface to restore avail index from vring used index
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Bugzilla: 1491909
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RH-Acked-by: wexu@redhat.com
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RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Xiao Wang <jasowang@redhat.com>
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In case of backend crash, it is not possible to restore internal
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avail index from the backend value as vhost_get_vring_base
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callback fails.
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This patch provides a new interface to restore internal avail index
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from the vring used index, as done by some vhost-user backend on
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reconnection.
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Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.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 2d4ba6cc741df15df6fbb4feaa706a02e103083a)
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Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/virtio/virtio.c | 10 ++++++++++
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include/hw/virtio/virtio.h | 1 +
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2 files changed, 11 insertions(+)
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diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
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index e7a2bc2..58ecf75 100644
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--- a/hw/virtio/virtio.c
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+++ b/hw/virtio/virtio.c
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@@ -2329,6 +2329,16 @@ void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx)
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vdev->vq[n].shadow_avail_idx = idx;
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}
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+void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n)
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+{
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+ rcu_read_lock();
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+ if (vdev->vq[n].vring.desc) {
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+ vdev->vq[n].last_avail_idx = vring_used_idx(&vdev->vq[n]);
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+ vdev->vq[n].shadow_avail_idx = vdev->vq[n].last_avail_idx;
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+ }
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+ rcu_read_unlock();
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+}
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+
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void virtio_queue_update_used_idx(VirtIODevice *vdev, int n)
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{
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rcu_read_lock();
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diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
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index 5faa359..912310c 100644
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--- a/include/hw/virtio/virtio.h
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+++ b/include/hw/virtio/virtio.h
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@@ -273,6 +273,7 @@ hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
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hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
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uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
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void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
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+void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n);
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void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
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void virtio_queue_update_used_idx(VirtIODevice *vdev, int n);
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VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
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--
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1.8.3.1
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