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hw: report invalid disable-legacy|modern usage for virtio-1-only devs

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A number of virtio devices (gpu, crypto, mouse, keyboard, tablet) only
support the virtio-1 (aka modern) mode. Currently if the user launches
QEMU, setting those devices to enable legacy mode, QEMU will silently
create them in modern mode, ignoring the user's (mistaken) request.

This patch introduces proper data validation so that an attempt to
configure a virtio-1-only devices in legacy mode gets reported as an
error to the user.

Checking this required introduction of a new field to explicitly track
what operating model is to be used for a device, separately from the
disable_modern and disable_legacy fields that record the user's
requested configuration.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190215103239.28640-2-berrange@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2019-02-15 10:32:38 +00:00 • committed by Michael S. Tsirkin
parent 2259637b95
commit f2784eed30
7 changed files with 73 additions and 23 deletions
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4
hw/virtio/virtio-input-pci.c
View file

@ -48,7 +48,9 @@ static void virtio_input_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
DeviceState *vdev = DEVICE(&vinput->vdev);
qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
virtio_pci_force_virtio_1(vpci_dev);
if (!virtio_pci_force_virtio_1(vpci_dev, errp)) {
return;
}
object_property_set_bool(OBJECT(vdev), true, "realized", errp);
}