Re: [Qemu-devel] [PATCH v4 0/6] Refactoring pc_dimm_plug and NUMA node lookup API

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

On Mon, Jun 29, 2015 at 02:32:09PM +0200, Igor Mammedov wrote:
> On Mon, 29 Jun 2015 13:50:21 +0530
> Bharata B Rao <bharata@linux.vnet.ibm.com> wrote:
> 
> > Hi,
> > 
> > Here is the v4 of the patchset that refactors pc_dimm_plug and adds
> > an API to lookup NUMA node by address.
> > 
> > - Refactoring pc_dimm_plug() helps other architectures like PowerPC
> >   to make use of common code.
> > - API to lookup NUMA node id by address is required to support memory
> >   hotplug on PowerPC sPAPR guests.
> > 
> > In addition to pc_dimm_plug() reorganization and NUMA node lookup
> > API, this patchset also carries a patch to abort when
> > HotplugHandlerClass::plug() fails for pc machine.
> > 
> > The patchset that adds memory hotplug support to PowerPC sPAPR which
> > was posted at
> > http://lists.nongnu.org/archive/html/qemu-devel/2015-06/msg06574.html
> > depends on this patchset.
> > 
> > Changes in v4:
> > -------------
> > - Ensure memory range information is stored in node_info[0] for
> >   non-NUMA configurations. (5/6)
> > - Ensure numa_get_node() API looks up the given address in node 0
> >   for non-NUMA configurations. (6/6)
> > 
> > In addition the following changes based on Igor's review:
> > 
> > - hhc->plug() shouldn't fail for PC arch, hence don't try to recover
> >   by calling pc_dimm_memory_unplug(). (2/6)
> > - Use pc_dimm_memory_unplug() from pc_dimm_unplug(). (2/6)
> > - Add a patch to use error_abort in hhc->plug(). (3/6)
> > - Store exact address range (start, end and not end+1) in numa_info
> >   and modify the lookup logic accordingly. (4/6, 6/6)
> > 
> > v3: http://lists.nongnu.org/archive/html/qemu-devel/2015-06/msg06768.html
> > v2: https://lists.gnu.org/archive/html/qemu-devel/2015-06/msg05157.html
> > v1: https://lists.gnu.org/archive/html/qemu-devel/2015-06/msg03212.html
> > v0: https://lists.gnu.org/archive/html/qemu-devel/2015-05/msg01078.html
> > 
> > Bharata B Rao (6):
> >   pc,pc-dimm: Extract hotplug related fields in PCMachineState to a
> >     structure
> >   pc,pc-dimm: Factor out reusable parts in pc_dimm_plug to a separate
> >     routine
> >   pc: Abort if HotplugHandlerClass::plug() fails
> >   numa,pc-dimm: Store pc-dimm memory information in numa_info
> >   numa: Store boot memory address range in node_info
> >   numa: API to lookup NUMA node by address
> > 
> >  hw/i386/acpi-build.c     |  2 +-
> >  hw/i386/pc.c             | 84 +++++++------------------------------------
> >  hw/mem/pc-dimm.c         | 84 +++++++++++++++++++++++++++++++++++++++++++
> >  include/hw/i386/pc.h     |  7 ++--
> >  include/hw/mem/pc-dimm.h | 15 ++++++++
> >  include/sysemu/numa.h    | 11 ++++++
> >  numa.c                   | 94 ++++++++++++++++++++++++++++++++++++++++++++++++
> >  7 files changed, 219 insertions(+), 78 deletions(-)
> > 
> 
> tested wrt PC memory hotplug, hence for series
> 
> Tested-by: Igor Mammedov <imammedo@redhat.com>

Thanks a lot.

I have tested this with out-of-the-tree PowerPC sPAPR memory hotplug
patchset for scenarios like hotplugging memory to non-NUMA guest,
single and multiple NUMA node guest and guest with memory-less nodes.

Regards,
Bharata.