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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
http://lists.nongnu.org/archive/html/qemu-devel/2015-08/msg00522.html
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(-)
--
2.1.0
- [Qemu-devel] [RFC v1 0/2] Enforce gaps between DIMMs,
Bharata B Rao <=