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[Qemu-devel] Re: Configuration vs. compat hints
From: |
Markus Armbruster |
Subject: |
[Qemu-devel] Re: Configuration vs. compat hints |
Date: |
Mon, 15 Jun 2009 13:35:02 +0200 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.3 (gnu/linux) |
Avi Kivity <address@hidden> writes:
> On 06/15/2009 12:08 PM, Mark McLoughlin wrote:
>>> This last option makes sense to me: in a real world the user has
>>> control over where he places the device on the bus, so why
>>> not with qemu?
>>>
>>
>> Yep, most people seem to agree that it makes sense to allow this, but
>> some believe it should only be via a machine description file, not the
>> command line.
>>
>
> I don't understand this opposition. It's clear a machine config file
> is a long way in our future. It's also clear lack of stable PCI
> addresses hurts us now.
Correct.
>> However, the first problem is that it isn't a solution to the guest ABI
>> problem more generally.
>>
>
> pci_addr was never meant to bring world peace, just stable PCI
> addresses. The other issues should be addressed separately.
>
>> And the second problem is that for e.g. libvirt to use it, it would have
>> to be possible to query qemu for what PCI slots were assigned to the
>> devices - libvirt would need to be able to parse 'info pci' and match
>> the devices listed with the devices specified on the command line.
>>
>
> If all devices (including vga, ide) are set up with pci_addr, then
> this is unneeded. You do need to export available slot numbers from
> qemu.
Not really. QEMU gives just the host bridge a fixed slot[*]. All the
other slots are available.
The real problem is devices that get implicitly added, like the SCSI
controller. Those devices get their slots auto-assigned, which can
interfere with slot numbers chosen by the user. We need a way to avoid
that, as you suggested elsewhere in this thread.
[*] There's an exception or two for oddball targets.
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], (continued)
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Avi Kivity, 2009/06/16
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Mark McLoughlin, 2009/06/16
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Avi Kivity, 2009/06/16
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Jamie Lokier, 2009/06/16
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Mark McLoughlin, 2009/06/17
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Avi Kivity, 2009/06/17
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Mark McLoughlin, 2009/06/17
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Avi Kivity, 2009/06/17
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Jamie Lokier, 2009/06/17
- RE: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Dietmar Maurer, 2009/06/24
- [Qemu-devel] Re: Configuration vs. compat hints,
Markus Armbruster <=
- [Qemu-devel] Re: Configuration vs. compat hints, Avi Kivity, 2009/06/15
- Re: [Qemu-devel] Re: Configuration vs. compat hints, Stefano Stabellini, 2009/06/15
- Re: [Qemu-devel] Re: Configuration vs. compat hints, Markus Armbruster, 2009/06/15
- Re: [Qemu-devel] Re: Configuration vs. compat hints, Anthony Liguori, 2009/06/15
- [Qemu-devel] Re: Configuration vs. compat hints, Javier Guerra, 2009/06/15
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Anthony Liguori, 2009/06/15
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Avi Kivity, 2009/06/15
- [Qemu-devel] Re: Configuration vs. compat hints, Markus Armbruster, 2009/06/15
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Avi Kivity, 2009/06/15
- Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities], Michael S. Tsirkin, 2009/06/15