[Qemu-devel] [PATCH v3 0/2] s390x/kvm: Properly detect page size of initial memory

[David Hildenbrand <david@redhat.com>]

While the detection on s390x of the maximum ram pagesize works by pure luck,
we should try to do better. Especially, once "-mem-path" is replaced
by memory backends, the current approach will break.

Configure the maximum page size after configuring initital memory. Provide
a function to detect the maximum ram pagesize

I think this can be deferred to 4.1 as I don't think anything is actually
broken right now.

v2 -> v3:
- Fix compile error
- Tested that hugepages correctly result in an error with
  "modprobe kvm hpage=0", but not with "modprobe kvm hpage=1".

v1 -> v2:
- Add a better comment describing that only initial memory is considered
- Add "exec: Introduce qemu_getmaxrampagesize() and rename
  qemu_getrampagesize()"

David Hildenbrand (2):
  s390x/kvm: Configure page size after memory has actually been
    initialized
  exec: Introduce qemu_maxrampagesize() and rename qemu_getrampagesize()

 exec.c                     | 44 ++++++++++++++++++++++++++++++++++----
 hw/ppc/spapr_caps.c        |  4 ++--
 hw/s390x/s390-virtio-ccw.c | 12 +++++++++++
 hw/vfio/spapr.c            |  2 +-
 include/exec/ram_addr.h    |  3 ++-
 target/ppc/kvm.c           |  2 +-
 target/s390x/cpu.c         |  7 ++++++
 target/s390x/cpu.h         |  1 +
 target/s390x/kvm-stub.c    |  4 ++++
 target/s390x/kvm.c         | 35 ++++++++++++------------------
 target/s390x/kvm_s390x.h   |  1 +
 11 files changed, 85 insertions(+), 30 deletions(-)

-- 
2.20.1