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Tsirkin" , Eduardo Habkost , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Commit 9b3a35ec82 ("virtio: verify that legacy support is not accidentally on") added a check that returns an error if legacy support is on, but the device is not legacy. Unfortunately some devices were wrongly declared legacy even if they were not (e.g vhost-vsock). To avoid migration issues, we disable this error for machine types < 5.1, but we print a warning. Cc: qemu-stable@nongnu.org Fixes: 9b3a35ec82 ("virtio: verify that legacy support is not accidentally = on") Suggested-by: Dr. David Alan Gilbert Suggested-by: Cornelia Huck Signed-off-by: Stefano Garzarella --- include/hw/virtio/virtio.h | 1 + hw/core/machine.c | 1 + hw/virtio/virtio.c | 18 ++++++++++++++++-- 3 files changed, 18 insertions(+), 2 deletions(-) diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 807280451b..ed7cee348b 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -103,6 +103,7 @@ struct VirtIODevice bool use_started; bool started; bool start_on_kick; /* when virtio 1.0 feature has not been negotiated= */ + bool disable_legacy_check; VMChangeStateEntry *vmstate; char *bus_name; uint8_t device_endian; diff --git a/hw/core/machine.c b/hw/core/machine.c index ea26d61237..b686eab798 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -44,6 +44,7 @@ GlobalProperty hw_compat_5_0[] =3D { { "vmport", "x-signal-unsupported-cmd", "off" }, { "vmport", "x-report-vmx-type", "off" }, { "vmport", "x-cmds-v2", "off" }, + { "virtio-device", "x-disable-legacy-check", "true" }, }; const size_t hw_compat_5_0_len =3D G_N_ELEMENTS(hw_compat_5_0); =20 diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index e983025217..30ccc43b8c 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -3287,6 +3287,8 @@ void virtio_init(VirtIODevice *vdev, const char *name, */ bool virtio_legacy_allowed(VirtIODevice *vdev) { + bool ret =3D false; + switch (vdev->device_id) { case VIRTIO_ID_NET: case VIRTIO_ID_BLOCK: @@ -3298,10 +3300,20 @@ bool virtio_legacy_allowed(VirtIODevice *vdev) case VIRTIO_ID_9P: case VIRTIO_ID_RPROC_SERIAL: case VIRTIO_ID_CAIF: + ret =3D true; + } + + /* + * For backward compatibility, we allow legacy mode with old machine t= ypes + * to get the migration working. + */ + if (!ret && vdev->disable_legacy_check) { + warn_report("device is modern-only, but for backward compatibility= " + "legacy is allowed"); return true; - default: - return false; } + + return ret; } =20 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) @@ -3713,6 +3725,8 @@ static Property virtio_properties[] =3D { DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), DEFINE_PROP_BOOL("use-started", VirtIODevice, use_started, true), DEFINE_PROP_BOOL("use-disabled-flag", VirtIODevice, use_disabled_flag,= true), + DEFINE_PROP_BOOL("x-disable-legacy-check", VirtIODevice, + disable_legacy_check, false), DEFINE_PROP_END_OF_LIST(), }; =20 --=20 2.26.2