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authorrusty <rusty@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>2014-06-05 06:44:53 +0000
committerrusty <rusty@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>2014-06-05 06:44:53 +0000
commitfffcbe327c69e510239fff5627034aa2ab4b2d84 (patch)
tree30120c45b0007fafeb048aa06c998027b72c2559 /newdevice.tex
parent6a83c1d41748dd79ec16c7faaa44bed904d79879 (diff)
pci: switch from subsystem id to device id
Switch virtio pci to use standard device id instead of using the subsystem id. Unfortunately, there's no system to the way KVM allocated device IDs to virtio devices, we'll just have to specify these using a table, and use a new range for future devices. For existing devices this results in two possible IDs that all drivers will need to match. Unfortunate, but the cost is small. As a nice side effect, this allows us to make non-transitional devices use IDs 0x40 and up, this reduces even further the chance that a non transitional device will match legacy drivers. And, it's probably a good idea to allow drivers to match specific subsystem IDs if they want to, so relax requirement for drivers to match all subsystem/vendor ID configurations, but allow them to do so. To avoid confusion, say "PCI Device ID" and "PCI Subsystem ID" everywhere, prefix "PCI" for other standard registers, for consistency. VIRTIO-102 Note: issue reporter suggested 0x10XX where XX is the virtio device ID. This would conflict with legacy devices, which seem to have used 7 IDs in the range 0x1000 to 0x103f without any system. Let's use a new range 0x1040 to 0x107f for non-transitional devices, and add a table documenting the transitional IDs used by in practice. (Approved at 2014-06-04 meeting: https://lists.oasis-open.org/archives/virtio/201406/msg00013.html ) Cc: Andrew Thornton <andrewth@google.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@au1.ibm.com> git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@376 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
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