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Re: Guests wont start with 15 pcie-root-port devices

From: Daniel P . Berrangé
Subject: Re: Guests wont start with 15 pcie-root-port devices
Date: Fri, 12 Nov 2021 17:53:42 +0000
User-agent: Mutt/2.0.7 (2021-05-04)

On Fri, Nov 12, 2021 at 12:35:07PM -0500, Brian Rak wrote:
> In 6.1, a guest with 15 empty pcie-root-port devices will not boot properly
> - it just hangs on "Guest has not initialized the display (yet).".  As soon
> as I remove the last pcie-root-port, the guest begins starting up normally. 

Yes, QEMU 6.1 has a regression


> commit e2a6290aab578b2170c1f5909fa556385dc0d820
> Author: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
> Date:   Mon Aug 2 12:00:57 2021 +0300
>     hw/pcie-root-port: Fix hotplug for PCI devices requiring IO
> Although I can't say I really understand why that commit triggered it.

It caused the firmware to always allocate I/O space for every port
and there's limited total I/O space, so it runs out at 15 devices.

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