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vfio/virtio: Enable support for virtio-block live migration

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With a functional and tested backend for virtio-block live migration,
add the virtio-block device ID to the pci_device_id table.

Currently, the driver supports legacy IO functionality only for
virtio-net, and it is accounted for in specific parts of the code.

To enforce this limitation, an explicit check for virtio-net, has been
added in virtiovf_support_legacy_io(). Once a backend implements legacy
IO functionality for virtio-block, the necessary support will be added
to the driver, and this additional check should be removed.

The module description was updated accordingly.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20250302162723.82578-1-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yishai Hadas 2025-03-02 18:27:23 +02:00 committed by Alex Williamson
parent 0fd06844de
commit 384a530111
3 changed files with 9 additions and 6 deletions
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6
drivers/vfio/pci/virtio/Kconfig
View File

@ -1,11 +1,11 @@
# SPDX-License-Identifier: GPL-2.0-only
config VIRTIO_VFIO_PCI
tristate "VFIO support for VIRTIO NET PCI VF devices"
tristate "VFIO support for VIRTIO PCI VF devices"
depends on VIRTIO_PCI
select VFIO_PCI_CORE
help
This provides migration support for VIRTIO NET PCI VF devices
using the VFIO framework. Migration support requires the
This provides migration support for VIRTIO NET and BLOCK PCI VF
devices using the VFIO framework. Migration support requires the
SR-IOV PF device to support specific VIRTIO extensions,
otherwise this driver provides no additional functionality
beyond vfio-pci.

4
drivers/vfio/pci/virtio/legacy_io.c
View File

@ -382,7 +382,9 @@ static bool virtiovf_bar0_exists(struct pci_dev *pdev)
bool virtiovf_support_legacy_io(struct pci_dev *pdev)
{
return virtio_pci_admin_has_legacy_io(pdev) && !virtiovf_bar0_exists(pdev);
/* For now, the legacy IO functionality is supported only for virtio-net */
return pdev->device == 0x1041 && virtio_pci_admin_has_legacy_io(pdev) &&
!virtiovf_bar0_exists(pdev);
}
int virtiovf_init_legacy_io(struct virtiovf_pci_core_device *virtvdev)

5
drivers/vfio/pci/virtio/main.c
View File

@ -187,8 +187,9 @@ static void virtiovf_pci_remove(struct pci_dev *pdev)
}
static const struct pci_device_id virtiovf_pci_table[] = {
/* Only virtio-net is supported/tested so far */
/* Only virtio-net and virtio-block are supported/tested so far */
{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1041) },
{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1042) },
{}
};
@ -221,4 +222,4 @@ module_pci_driver(virtiovf_pci_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yishai Hadas <yishaih@nvidia.com>");
MODULE_DESCRIPTION(
"VIRTIO VFIO PCI - User Level meta-driver for VIRTIO NET devices");
"VIRTIO VFIO PCI - User Level meta-driver for VIRTIO NET and BLOCK devices");