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Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host b

From: Marcel Apfelbaum
Subject: Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges
Date: Tue, 22 May 2018 21:43:45 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 05/22/2018 09:03 AM, Zihan Yang wrote:
> An interesting point is if we want to limit the MMFCG size for PXBs, as we may not be
> interested to use all the buses in a specific domain.

OK, perhaps providing an option for the user to specify the desired bus numbers?

Right, specifying the number of buses that can be used (e.g: max_busses) will decrease a lot
the amount of address space we have to reserve.

> For each bus we require some address space that remains unused.

Does this mean we should reserve some slots in a bus, or reduce
the number of buses used in each domain?

Limit the number of buses per PCI domain (excluding PCI domain 0, of course)

> [Adding Laszlo for his insights]
> Looking forward to see the SeaBIOS patches :)

I appreciate your reviews, I'll write the rest part as soon as possible.



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