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Re: [Qemu-devel] [RFC] qmp: query-device-slots command
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [RFC] qmp: query-device-slots command |
Date: |
Fri, 16 Dec 2016 10:36:50 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Laine Stump <address@hidden> writes:
> On 12/15/2016 05:12 AM, Marcel Apfelbaum wrote:
>> On 12/14/2016 10:10 PM, Laine Stump wrote:
>>> On 12/14/2016 12:17 PM, Marcel Apfelbaum wrote:
>>>> Be aware that 1 slot doesn't necessarily refer to only one device,
>>>> we can have a multi-function device.
>>>
>>> Is that a fixed thing? I mean, is it always possible to use all 8
>>> functions of a slot (assuming no hotplug of course)?
>>>
>>
>> Yes, you simply add to the function 0 on command line: with -device
>> ...,multifunction=on.
>
> Yes, I know how the commandline works. my question is whether *all*
> PCI controllers in existence have 8 usable functions per slot, or if
> that might be another thing that is different from one controller to
> the next (and thus would have to be reported in these query
> responses).
Quote from PCI Express Base Specification Revision 3.0: "Each non-ARI
Device may contain up to eight Functions. Each ARI Device may contain
up to 256 Functions."
The address format is defined by the PCI spec: bus number is 8 bits,
device number is 5, function number is 3.
However, a device may be an ARI device (ARI = Alternative Routing-ID
Interpretation), and then the device number bits are instead used for a
wider function number. As far as I know, this is PCIe-only. See PCI
Express Base Specification Revision 3.0, 6.13. Alternative Routing-ID
Interpretation (ARI).
- [Qemu-devel] [RFC] qmp: query-device-slots command, Eduardo Habkost, 2016/12/08
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Markus Armbruster, 2016/12/13
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Eduardo Habkost, 2016/12/13
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Marcel Apfelbaum, 2016/12/13
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Eduardo Habkost, 2016/12/13
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Marcel Apfelbaum, 2016/12/14
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Laine Stump, 2016/12/14
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Marcel Apfelbaum, 2016/12/15
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Laine Stump, 2016/12/15
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Eduardo Habkost, 2016/12/15
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command,
Markus Armbruster <=
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Markus Armbruster, 2016/12/13
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Eduardo Habkost, 2016/12/13
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Markus Armbruster, 2016/12/14
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Eduardo Habkost, 2016/12/14
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Markus Armbruster, 2016/12/14
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Eduardo Habkost, 2016/12/15
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Markus Armbruster, 2016/12/16
- Re: [Qemu-devel] [RFC] qmp: query-device-slots command, Eduardo Habkost, 2016/12/16