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Re: [Qemu-devel] Managing architectural restrictions with -device and li
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt |
Date: |
Tue, 4 Jul 2017 21:44:47 +0100 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
On Tue, Jul 04, 2017 at 07:25:41PM +0100, Mark Cave-Ayland wrote:
> Hi all,
>
> I've been working on a patchset that brings the sun4u machine on
> qemu-system-sparc64 much closer to a real Ultra 5, however due to
> various design restrictions I need to be able to restrict how devices
> are added to the machine with -device.
>
> On a real Ultra 5, the root PCI bus (sabre) has 2 PCI bridges (simba A
> and simba B) with the onboard devices attached to simba A with 2 free
> slots, and an initially empty simba B.
>
> Firstly, is it possible to restrict the machine so that devices cannot
> be directly plugged into the root PCI bus, but only behind one of the
> PCI bridges? There is also an additional restriction in that slot 0
> behind simba A must be left empty to ensure that the ebus (containing
> the onboard devices) is the first device allocated.
>
> Secondly, how does libvirt handle these type of restrictions? Is it able
> to get the information from QEMU or is there some kind of libvirt
> profile that needs to be updated? And do newer versions of libvirt have
> the ability to attach devices behind PCI bridges using a GUI such as
> virt-manager, or is that only something that can only be done by
> directly editing the domain XML?
Libvirt has a bunch of code that provides different logic for various
machine types when doing addressing & setting up default PCI controllers.
Libvirt support for sparc machine types almost certainly broken since
I'm not aware of anyone having looked at it forever. Probably best to
re-ask your Q's on the libvir-list to get info from the people familiar
with this, since I'm fuzzy on precise details of what you'd need todo.
Regards,
Daniel
--
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- [Qemu-devel] Managing architectural restrictions with -device and libvirt, Mark Cave-Ayland, 2017/07/04
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt,
Daniel P. Berrange <=
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Markus Armbruster, 2017/07/05
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Mark Cave-Ayland, 2017/07/05
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Markus Armbruster, 2017/07/05
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Mark Cave-Ayland, 2017/07/05
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Markus Armbruster, 2017/07/05
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Mark Cave-Ayland, 2017/07/06
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Marcel Apfelbaum, 2017/07/06
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Markus Armbruster, 2017/07/06
- Re: [Qemu-devel] Managing architectural restrictions with -device and libvirt, Marcel Apfelbaum, 2017/07/06