vhost-vsock: fix migration issue when seqpacket is supported

Commit 1e08fd0a46 ("vhost-vsock: SOCK_SEQPACKET feature bit support")
enabled the SEQPACKET feature bit.
This commit is released with QEMU 6.1, so if we try to migrate a VM where
the host kernel supports SEQPACKET but machine type version is less than
6.1, we get the following errors:

    Features 0x130000002 unsupported. Allowed features: 0x179000000
    Failed to load virtio-vhost_vsock:virtio
    error while loading state for instance 0x0 of device '0000:00:05.0/virtio-vhost_vsock'
    load of migration failed: Operation not permitted

Let's disable the feature bit for machine types < 6.1.
We add a new OnOffAuto property for this, called `seqpacket`.
When it is `auto` (default), QEMU behaves as before, trying to enable the
feature, when it is `on` QEMU will fail if the backend (vhost-vsock
kernel module) doesn't support it.

Fixes: 1e08fd0a46 ("vhost-vsock: SOCK_SEQPACKET feature bit support")
Cc: qemu-stable@nongnu.org
Reported-by: Jiang Wang <jiang.wang@bytedance.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20210921161642.206461-2-sgarzare@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/core/machine.c b/hw/core/machine.c
index 3920a2f2af0bd744db081074d497628ac52003e1..74f2a9a984c9cbef8c0b78dfda5fa9ebfb626c5b 100644 (file)
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -46,6 +46,7 @@ GlobalProperty hw_compat_6_0[] = {
     { "nvme-ns", "eui64-default", "off"},
     { "e1000", "init-vet", "off" },
     { "e1000e", "init-vet", "off" },
+    { "vhost-vsock-device", "seqpacket", "off" },
 };
 const size_t hw_compat_6_0_len = G_N_ELEMENTS(hw_compat_6_0);
 

diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c
index 1b1a5c70eded006acf3cd142b6e6afaf2915ede4..dade0da03147705ede0180dc3039b59590a1ea0d 100644 (file)
--- a/hw/virtio/vhost-vsock.c
+++ b/hw/virtio/vhost-vsock.c
@@ -114,10 +114,21 @@ static uint64_t vhost_vsock_get_features(VirtIODevice *vdev,
                                          Error **errp)
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
+    VHostVSock *vsock = VHOST_VSOCK(vdev);
+
+    if (vsock->seqpacket != ON_OFF_AUTO_OFF) {
+        virtio_add_feature(&requested_features, VIRTIO_VSOCK_F_SEQPACKET);
+    }
+
+    requested_features = vhost_get_features(&vvc->vhost_dev, feature_bits,
+                                            requested_features);
+
+    if (vsock->seqpacket == ON_OFF_AUTO_ON &&
+        !virtio_has_feature(requested_features, VIRTIO_VSOCK_F_SEQPACKET)) {
+        error_setg(errp, "vhost-vsock backend doesn't support seqpacket");
+    }
 
-    virtio_add_feature(&requested_features, VIRTIO_VSOCK_F_SEQPACKET);
-    return vhost_get_features(&vvc->vhost_dev, feature_bits,
-                                requested_features);
+    return requested_features;
 }
 
 static const VMStateDescription vmstate_virtio_vhost_vsock = {
@@ -218,6 +229,8 @@ static void vhost_vsock_device_unrealize(DeviceState *dev)
 static Property vhost_vsock_properties[] = {
     DEFINE_PROP_UINT64("guest-cid", VHostVSock, conf.guest_cid, 0),
     DEFINE_PROP_STRING("vhostfd", VHostVSock, conf.vhostfd),
+    DEFINE_PROP_ON_OFF_AUTO("seqpacket", VHostVSock, seqpacket,
+                            ON_OFF_AUTO_AUTO),
     DEFINE_PROP_END_OF_LIST(),
 };
 

diff --git a/include/hw/virtio/vhost-vsock.h b/include/hw/virtio/vhost-vsock.h
index 84f4e727c70fa7a00b68487e22f2b0201d94b021..3f121a624f21796947dd1fbe3ed46b37d15d27db 100644 (file)
--- a/include/hw/virtio/vhost-vsock.h
+++ b/include/hw/virtio/vhost-vsock.h
@@ -30,6 +30,9 @@ struct VHostVSock {
     VHostVSockCommon parent;
     VHostVSockConf conf;
 
+    /* features */
+    OnOffAuto seqpacket;
+
     /*< public >*/
 };