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Subject: Re: [virtio] [PATCH] pci: switch from subsystem id to device id


> Note: issue reporter suggested 0x10XX where XX is the virtio
> device ID. This would break all legacy drivers, historically
> PCI Device ID is off by one: 0xFFF + Virtio Device ID.

Adding 0xfff works for for net+block only.
There seems to be no fixed scheme:

nilsson kraxel ~/projects/qemu/include # grep VIRTIO_ID hw/virtio/*.h 
hw/virtio/virtio-balloon.h:#define VIRTIO_ID_BALLOON 5
hw/virtio/virtio-blk.h:#define VIRTIO_ID_BLOCK 2
hw/virtio/virtio-net.h:#define VIRTIO_ID_NET   1
hw/virtio/virtio-rng.h:#define VIRTIO_ID_RNG    4
hw/virtio/virtio-scsi.h:#define VIRTIO_ID_SCSI  8
hw/virtio/virtio-serial.h:#define VIRTIO_ID_CONSOLE             3

nilsson kraxel ~/projects/qemu/include # grep VIRTIO hw/pci/*.h
hw/pci/pci.h:#define PCI_DEVICE_ID_VIRTIO_NET         0x1000
hw/pci/pci.h:#define PCI_DEVICE_ID_VIRTIO_BLOCK       0x1001
hw/pci/pci.h:#define PCI_DEVICE_ID_VIRTIO_BALLOON     0x1002
hw/pci/pci.h:#define PCI_DEVICE_ID_VIRTIO_CONSOLE     0x1003
hw/pci/pci.h:#define PCI_DEVICE_ID_VIRTIO_SCSI        0x1004
hw/pci/pci.h:#define PCI_DEVICE_ID_VIRTIO_RNG         0x1005
hw/pci/pci.h:#define PCI_DEVICE_ID_VIRTIO_9P          0x1009


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