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

[Brian Rak]

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
> >
> >    https://gitlab.com/qemu-project/qemu/-/issues/641
> >
> >
> > > 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
>   20211112110857.3116853-1-imammedo@redhat.com/">https://patchew.org/QEMU/20211112110857.3116853-1-imammedo@redhat.com/
>
> > Regards,
> > Daniel