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6209070503
Commit 9b3a35ec82 ("virtio: verify that legacy support is not
accidentally on") added a safety check that requires to set
'disable-legacy=on' on vhost-vsock-pci device:
$ ./qemu-system-x86_64 ... -device vhost-vsock-pci,guest-cid=5
qemu-system-x86_64: -device vhost-vsock-pci,guest-cid=5:
device is modern-only, use disable-legacy=on
virtio-vsock was introduced after the release of VIRTIO 1.0
specifications, so it should be 'modern-only'.
In addition Cornelia verified that forcing a legacy mode on
vhost-vsock-pci device using x86-64 host and s390x guest, so with
different endianness, produces strange behaviours.
This patch forces virtio version 1 and removes the 'transitional_name'
property removing the need to specify 'disable-legacy=on' on
vhost-vsock-pci device.
To avoid migration issues, we force virtio version 1 only when
legacy check is enabled in the new machine types (>= 5.1).
As the transitional device name is not commonly used, we do not
provide compatibility handling for it.
Cc: qemu-stable@nongnu.org
Reported-by: Qian Cai <caiqian@redhat.com>
Reported-by: Qinghua Cheng <qcheng@redhat.com>
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1868449
Suggested-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20200921122506.82515-3-sgarzare@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* Vhost vsock PCI Bindings
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*
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* Copyright 2015 Red Hat, Inc.
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "virtio-pci.h"
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#include "hw/qdev-properties.h"
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#include "hw/virtio/vhost-vsock.h"
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#include "qemu/module.h"
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#include "qom/object.h"
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typedef struct VHostVSockPCI VHostVSockPCI;
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/*
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* vhost-vsock-pci: This extends VirtioPCIProxy.
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*/
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#define TYPE_VHOST_VSOCK_PCI "vhost-vsock-pci-base"
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DECLARE_INSTANCE_CHECKER(VHostVSockPCI, VHOST_VSOCK_PCI,
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TYPE_VHOST_VSOCK_PCI)
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struct VHostVSockPCI {
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VirtIOPCIProxy parent_obj;
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VHostVSock vdev;
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};
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/* vhost-vsock-pci */
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static Property vhost_vsock_pci_properties[] = {
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DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void vhost_vsock_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
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{
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VHostVSockPCI *dev = VHOST_VSOCK_PCI(vpci_dev);
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DeviceState *vdev = DEVICE(&dev->vdev);
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VirtIODevice *virtio_dev = VIRTIO_DEVICE(vdev);
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/*
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* To avoid migration issues, we force virtio version 1 only when
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* legacy check is enabled in the new machine types (>= 5.1).
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*/
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if (!virtio_legacy_check_disabled(virtio_dev)) {
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virtio_pci_force_virtio_1(vpci_dev);
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}
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qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
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}
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static void vhost_vsock_pci_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
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PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
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k->realize = vhost_vsock_pci_realize;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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device_class_set_props(dc, vhost_vsock_pci_properties);
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pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
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pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_VSOCK;
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pcidev_k->revision = 0x00;
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pcidev_k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
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}
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static void vhost_vsock_pci_instance_init(Object *obj)
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{
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VHostVSockPCI *dev = VHOST_VSOCK_PCI(obj);
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virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
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TYPE_VHOST_VSOCK);
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}
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static const VirtioPCIDeviceTypeInfo vhost_vsock_pci_info = {
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.base_name = TYPE_VHOST_VSOCK_PCI,
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.generic_name = "vhost-vsock-pci",
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.non_transitional_name = "vhost-vsock-pci-non-transitional",
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.instance_size = sizeof(VHostVSockPCI),
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.instance_init = vhost_vsock_pci_instance_init,
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.class_init = vhost_vsock_pci_class_init,
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};
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static void virtio_pci_vhost_register(void)
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{
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virtio_pci_types_register(&vhost_vsock_pci_info);
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}
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type_init(virtio_pci_vhost_register)
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