Re: [Qemu-devel] [PATCH 00/35] pc: ACPI memory hotplug

[Igor Mammedov]

On Fri, 04 Apr 2014 16:07:53 +0200
Paolo Bonzini <address@hidden> wrote:

> Il 04/04/2014 15:36, Igor Mammedov ha scritto:
> >
> > * dropped support for 32 bit guests
> 
> Can you explain this more?
v7 had ability to map hotplugged DIMMs below 4Gb, but Gerd suggested to drop
it since it consume precious lowmem for PCI devices. This version maps
DIMM devices beyond above4gb memory. So "dropped support for 32 bit guests"
here means that if it can't handle GPA above 4Gb and 64bit _CRS, it won't have
working memory cold/hot-plug DIMM devices.

> 
> > PS:
> >   Windows guest requires SRAT table for hotplug to work so add an extra 
> > option:
> >    -numa node
> >   to QEMU command line.
> 
> Should we consider always exposing a SRAT for 2.1+ machine types?
That certainly would help management not have to worry about it.

> 
> Paolo


-- 
Regards,
  Igor