Re: [Qemu-devel] [PATCH RFC 0/6] q35: add acpi pci hotplug support

[Alexander Bezzubikov]

Hmm, I've failed to make SHPC (from current master) work on any modern
Linux guests.

2017-07-03 15:27 GMT+03:00 Igor Mammedov <address@hidden>:

> On Fri, 30 Jun 2017 10:25:05 +0300
> Marcel Apfelbaum <address@hidden> wrote:
>
> [...]
> >
> > So for the modern systems not supporting PCI ACPI hotplug
> > we don't need pci-bridges anyway, but for the older ones
> > the ACPI code of the pci-bridge will be loaded into the
> > ACPI namespace only if a pci-bridge is actually hot-plugged.
>
> just note that the set of 'older' guest OSes is limited to
> one that do not support SHPC (i.e. to EOLed WinXP & co)
> as for linux and more modern Windows SHPC hotplug should
> just work without our ACPI hack (which taxes low memory
> to keep acpi tables for bridges).
>
> So I'm in favor of Michael's suggestion to leave ACPI PCI
> only in PC machine for old WinXP guests and to keep Q35
> clean, where linux or newer Windows guests could just
> use standard SHPC.
>
> [...]
>



-- 
Alexander Bezzubikov