11380b3619
If you run a qemu advertising VERSION_1 with an old kernel where
vhost did not yet support VERSION_1, you'll end up with a device
that is {modern pci|ccw revision 1} but does not advertise VERSION_1.
This is not a sensible configuration and is rejected by the Linux
guest drivers.
To fix this, add a ->post_plugged() callback invoked after features
have been queried that can handle the VERSION_1 bit being withdrawn
and change ccw to fall back to revision 0 if VERSION_1 is gone.
Note that pci is _not_ fixed; we'll need to rethink the approach
for the next release but at least for pci it's not a regression.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
115 lines
4.2 KiB
C
115 lines
4.2 KiB
C
/*
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* VirtioBus
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*
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* Copyright (C) 2012 : GreenSocs Ltd
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* http://www.greensocs.com/ , email: info@greensocs.com
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*
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* Developed by :
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* Frederic Konrad <fred.konrad@greensocs.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef VIRTIO_BUS_H
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#define VIRTIO_BUS_H
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#include "hw/qdev.h"
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#include "sysemu/sysemu.h"
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#include "hw/virtio/virtio.h"
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#define TYPE_VIRTIO_BUS "virtio-bus"
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#define VIRTIO_BUS_GET_CLASS(obj) \
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OBJECT_GET_CLASS(VirtioBusClass, obj, TYPE_VIRTIO_BUS)
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#define VIRTIO_BUS_CLASS(klass) \
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OBJECT_CLASS_CHECK(VirtioBusClass, klass, TYPE_VIRTIO_BUS)
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#define VIRTIO_BUS(obj) OBJECT_CHECK(VirtioBusState, (obj), TYPE_VIRTIO_BUS)
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typedef struct VirtioBusState VirtioBusState;
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typedef struct VirtioBusClass {
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/* This is what a VirtioBus must implement */
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BusClass parent;
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void (*notify)(DeviceState *d, uint16_t vector);
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void (*save_config)(DeviceState *d, QEMUFile *f);
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void (*save_queue)(DeviceState *d, int n, QEMUFile *f);
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void (*save_extra_state)(DeviceState *d, QEMUFile *f);
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int (*load_config)(DeviceState *d, QEMUFile *f);
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int (*load_queue)(DeviceState *d, int n, QEMUFile *f);
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int (*load_done)(DeviceState *d, QEMUFile *f);
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int (*load_extra_state)(DeviceState *d, QEMUFile *f);
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bool (*has_extra_state)(DeviceState *d);
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bool (*query_guest_notifiers)(DeviceState *d);
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int (*set_guest_notifiers)(DeviceState *d, int nvqs, bool assign);
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int (*set_host_notifier)(DeviceState *d, int n, bool assigned);
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void (*vmstate_change)(DeviceState *d, bool running);
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/*
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* transport independent init function.
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* This is called by virtio-bus just after the device is plugged.
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*/
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void (*device_plugged)(DeviceState *d, Error **errp);
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/*
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* Re-evaluate setup after feature bits have been validated
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* by the device backend.
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*/
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void (*post_plugged)(DeviceState *d, Error **errp);
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/*
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* transport independent exit function.
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* This is called by virtio-bus just before the device is unplugged.
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*/
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void (*device_unplugged)(DeviceState *d);
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int (*query_nvectors)(DeviceState *d);
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/*
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* Does the transport have variable vring alignment?
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* (ie can it ever call virtio_queue_set_align()?)
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* Note that changing this will break migration for this transport.
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*/
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bool has_variable_vring_alignment;
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} VirtioBusClass;
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struct VirtioBusState {
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BusState parent_obj;
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};
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void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp);
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void virtio_bus_reset(VirtioBusState *bus);
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void virtio_bus_device_unplugged(VirtIODevice *bus);
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/* Get the device id of the plugged device. */
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uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus);
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/* Get the config_len field of the plugged device. */
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size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus);
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/* Get the features of the plugged device. */
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uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus,
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uint32_t requested_features);
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/* Get bad features of the plugged device. */
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uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus);
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/* Get config of the plugged device. */
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void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config);
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/* Set config of the plugged device. */
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void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config);
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static inline VirtIODevice *virtio_bus_get_device(VirtioBusState *bus)
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{
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BusState *qbus = &bus->parent_obj;
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BusChild *kid = QTAILQ_FIRST(&qbus->children);
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DeviceState *qdev = kid ? kid->child : NULL;
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/* This is used on the data path, the cast is guaranteed
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* to succeed by the qdev machinery.
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*/
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return (VirtIODevice *)qdev;
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}
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#endif /* VIRTIO_BUS_H */
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