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[Qemu-devel] [RFC v1 0/2] Enforce gaps between DIMMs

From: Bharata B Rao
Subject: [Qemu-devel] [RFC v1 0/2] Enforce gaps between DIMMs
Date: Fri, 9 Oct 2015 12:19:58 +0530

The suggested way to work around the virtio bug reported here


is to introduce gaps between DIMMs. Igor's patchset changes the pc-dimm
auto-address assignment to introduce gaps and ues the same from pc memhp.
This patchset does the same for sPAPR PowerPC.

Before introducing the gap, ensure that memory hotplug region has enough
room for alignment adjustment. We accommodate a max alignment of 256MB for
each slot since sPAPR memory hotplug enforces an alignment requirement of
256MB on RAM size, maxmem and NUMA node mem sizes.

This applies on David's spapr-next branch + Igor's patchset applied.

Changes in v1
- Create DRC objects spanning the alignment-adjusted hotplug memory
  region instead of just for (maxmem - ramsize).
- Pass an alignment of 256M to pc_dimm_memory_plug() so that we always
  get 256M aligned DIMM addresses.

v0: https://lists.gnu.org/archive/html/qemu-devel/2015-10/msg00749.html

Bharata B Rao (2):
  spapr: Accommadate alignment gaps in hotplug memory region
  spapr: Force gaps between DIMM's GPA

 hw/ppc/spapr.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)


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