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Subject[pci PATCH v4 2/4] virtio_pci: Add support for unmanaged SR-IOV on virtio_pci devices
From: Alexander Duyck <>

Hardware-realized virtio_pci devices can implement SR-IOV, so this
patch enables its use. The device in question is an upcoming Intel
NIC that implements both a virtio_net PF and virtio_net VFs. These
are hardware realizations of what has been up to now been a software

The device in question has the following 4-part PCI IDs:

PF: vendor: 1af4 device: 1041 subvendor: 8086 subdevice: 15fe
VF: vendor: 1af4 device: 1041 subvendor: 8086 subdevice: 05fe

The patch currently needs no check for device ID, because the callback
will never be made for devices that do not assert the capability or
when run on a platform incapable of SR-IOV.

One reason for this patch is because the hardware requires the
vendor ID of a VF to be the same as the vendor ID of the PF that
created it. So it seemed logical to simply have a fully-functioning
virtio_net PF create the VFs. This patch makes that possible.

Signed-off-by: Mark Rustad <>
Signed-off-by: Alexander Duyck <>

v4: Dropped call to pci_disable_sriov in virtio_pci_remove function

drivers/virtio/virtio_pci_common.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 48d4d1cf1cb6..27ab090163b4 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -596,6 +596,9 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
#ifdef CONFIG_PM_SLEEP = &virtio_pci_pm_ops,
+ .sriov_configure = pci_sriov_configure_unmanaged,

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