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

From: Brian Rak
Subject: Re: Guests wont start with 15 pcie-root-port devices
Date: Mon, 15 Nov 2021 11:57:43 -0500
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 Thunderbird/91.3.0

Will this fix make it into 6.2?

On 11/12/2021 3:51 PM, Igor Mammedov wrote:
On Fri, 12 Nov 2021 17:53:42 +0000
Daniel P. Berrangé <berrange@redhat.com> wrote:

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.
alternatively instead of reverting to native PCIe hotplug as in the issue
Daniel's mentioned, you can apply following fix


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