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From 8e0fdce814af4cfc84dce5e5920da989b1f1a86d 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: Thu, 21 Jul 2022 16:06:05 +0200
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Subject: [PATCH 26/32] vdpa: Add device migration blocker
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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: 108: Net Control Virtqueue shadow Support
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RH-Commit: [26/27] 53d94d45b5e5e88f12b95f9b0f243696cfcbd7ce (eperezmartin/qemu-kvm)
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RH-Bugzilla: 1939363
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/1939363
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Upstream Status: git://git.qemu.org/qemu.git
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commit c156d5bf2b142dcc06808ccee06882144f230aec
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Author: Eugenio Pérez <eperezma@redhat.com>
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Date: Wed Jul 20 08:59:45 2022 +0200
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vdpa: Add device migration blocker
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Since the vhost-vdpa device is exposing _F_LOG, adding a migration blocker if
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it uses CVQ.
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However, qemu is able to migrate simple devices with no CVQ as long as
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they use SVQ. To allow it, add a placeholder error to vhost_vdpa, and
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only add to vhost_dev when used. vhost_dev machinery place the migration
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blocker if needed.
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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---
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hw/virtio/vhost-vdpa.c | 15 +++++++++++++++
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include/hw/virtio/vhost-vdpa.h | 1 +
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2 files changed, 16 insertions(+)
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diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
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index 49effe5462..e3e5bce4bb 100644
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--- a/hw/virtio/vhost-vdpa.c
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+++ b/hw/virtio/vhost-vdpa.c
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@@ -20,6 +20,7 @@
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#include "hw/virtio/vhost-shadow-virtqueue.h"
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#include "hw/virtio/vhost-vdpa.h"
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#include "exec/address-spaces.h"
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+#include "migration/blocker.h"
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#include "qemu/main-loop.h"
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#include "cpu.h"
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#include "trace.h"
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@@ -1020,6 +1021,13 @@ static bool vhost_vdpa_svqs_start(struct vhost_dev *dev)
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return true;
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}
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+ if (v->migration_blocker) {
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+ int r = migrate_add_blocker(v->migration_blocker, &err;;
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+ if (unlikely(r < 0)) {
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+ return false;
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+ }
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+ }
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+
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for (i = 0; i < v->shadow_vqs->len; ++i) {
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VirtQueue *vq = virtio_get_queue(dev->vdev, dev->vq_index + i);
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VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, i);
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@@ -1062,6 +1070,10 @@ err:
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vhost_svq_stop(svq);
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}
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+ if (v->migration_blocker) {
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+ migrate_del_blocker(v->migration_blocker);
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+ }
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+
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return false;
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}
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@@ -1081,6 +1093,9 @@ static bool vhost_vdpa_svqs_stop(struct vhost_dev *dev)
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}
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}
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+ if (v->migration_blocker) {
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+ migrate_del_blocker(v->migration_blocker);
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+ }
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return true;
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}
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diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
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index 1111d85643..d10a89303e 100644
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--- a/include/hw/virtio/vhost-vdpa.h
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+++ b/include/hw/virtio/vhost-vdpa.h
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@@ -35,6 +35,7 @@ typedef struct vhost_vdpa {
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bool shadow_vqs_enabled;
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/* IOVA mapping used by the Shadow Virtqueue */
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VhostIOVATree *iova_tree;
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+ Error *migration_blocker;
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GPtrArray *shadow_vqs;
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const VhostShadowVirtqueueOps *shadow_vq_ops;
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void *shadow_vq_ops_opaque;
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--
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2.31.1
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