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| author | Yui Washizu <yui.washidu@gmail.com> | 2026-03-10 09:14:52 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2026-06-10 09:17:00 +0300 |
| commit | 82da84282c0746ae7c6d87dad7b8daba88f0d091 (patch) | |
| tree | 4c0ffc747b2c4843ecf74f7388a81029aa05f8f4 | |
| parent | 7222e8c8567e2aa1a2f1b4d3e40158d64ce538b6 (diff) | |
| download | linux-82da84282c0746ae7c6d87dad7b8daba88f0d091.tar.xz | |
virtio: add num_vf callback to virtio_bus
Recent QEMU versions added support for virtio SR-IOV emulation,
allowing virtio devices to expose SR-IOV VFs to the guest.
However, virtio_bus does not implement the num_vf callback of bus_type,
causing dev_num_vf() to return 0 for virtio devices even when
SR-IOV VFs are active.
net/core/rtnetlink.c calls dev_num_vf(dev->dev.parent) to populate
IFLA_NUM_VF in RTM_GETLINK responses. For a virtio-net device,
dev.parent points to the virtio_device, whose busis virtio_bus.
Without num_vf, SR-IOV VF information is silently
omitted from tools that rely on rtnetlink, such as 'ip link show'.
Add a num_vf callback that delegates to dev_num_vf(dev->parent),
which in turn reaches the underlying transport (pci_bus_type for
virtio-pci) where the actual VF count is tracked. Non-PCI transports
are unaffected as dev_num_vf() returns 0 when no num_vf callback is
present.
Signed-off-by: Yui Washizu <yui.washidu@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260310061454.683894-1-yui.washidu@gmail.com>
| -rw-r--r-- | drivers/virtio/virtio.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index 5bdc6b82b30b..299fa83be1d5 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -435,6 +435,14 @@ static void virtio_dev_shutdown(struct device *_d) dev->config->reset(dev); } +static int virtio_dev_num_vf(struct device *dev) +{ + struct virtio_device *vdev = dev_to_virtio(dev); + + return dev_num_vf(vdev->dev.parent); +} + + static const struct bus_type virtio_bus = { .name = "virtio", .match = virtio_dev_match, @@ -444,6 +452,7 @@ static const struct bus_type virtio_bus = { .remove = virtio_dev_remove, .irq_get_affinity = virtio_irq_get_affinity, .shutdown = virtio_dev_shutdown, + .num_vf = virtio_dev_num_vf, }; int __register_virtio_driver(struct virtio_driver *driver, struct module *owner) |