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Re: [Qemu-devel] [RFC 2/3] pci: Link pci_host_bridges with QTAILQ

From: Marcel Apfelbaum
Subject: Re: [Qemu-devel] [RFC 2/3] pci: Link pci_host_bridges with QTAILQ
Date: Tue, 22 May 2018 21:39:39 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

Hi Zihan,

On 05/22/2018 08:59 AM, Zihan Yang wrote:
>  have no objection here, we'll see later how the modification helps.

The purpose is to place the q35 host at the start of queue. In the original QLIST,
when a new pxb host is added, q35 host will be bumped to the end end list.

By replacing it with QTAILQ, we can always get q35 host bridges first, so that
we can make sure q35 host stays in pci domain 0. If there is no pxb host,
the code needs not change because the 'next' field will be NULL.

We can use the pxb list we keep, but I don't see an issue here.

I'm not sure whether it is necessary to let q35 host reside in pci domain 0, but I think I'd better reserve the original when I don't know the potential impact.

Q35 should always reside in PCI domain 0.



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