[Xen-devel] [PATCH 2.1 v7 0/3] Add max-ram-below-4g (was Add pci_hole_min_size machine option)

[Don Slutz <dslutz@xxxxxxxxxxx>]

Changes v6 to v7:
  Drop most of v5 to v6 changes.

  Michael S. Tsirkin:
    #2 "pc & q35: Add new machine opt max-ram-below-4g":
       default: max-ram-below-4g=4g
       pc & q35:
          calculate lowmem
          lowmem = MIN(lowmem, max-ram-below-4g)
          calculate above_4g_mem_size and below_4g_mem_size

  #3 "xen-hvm: Handle machine opt max-ram-below-4g":
     Rename from "xen-hvm: Pass is_default to xen_hvm_init"
     Drop is_default.
     Use object_property_get_int() to get max-ram-below-4g.
     Do min(xen limit, user limit).


Changes v5 to v6:
  rebased on git://git.kernel.org/pub/scm/virt/kvm/mst/qemu.git pci

  Changed default handling.  Most pc machines are now set to 3.5G
  (0xe0000000) and q35 are set to 2.75G (0xb0000000).  The special
  value of 0 is used to flag the complex gigabyte_align memory
  layout selection.

  I did change the default for pc-i440fx-2.1 to 3G and pc-q35-2.1 to
  2G instead of the complex gigabyte_align.  This looks ok to me
  because the statement by Gerd Hoffmann is about more ram for 32
  bit (+non-PAE) guests can now have more then the defualt by
  specifing the new option like "max-ram-below-4g=3.75G" or
  "max-ram-below-4g=3.9375G".  Or if that is too complex to
  understand just select pc-i440fx-2.0 or pc-q35-2.0 to get what
  they use to get.

  Michael S. Tsirkin, Igor Mammedov, Marcel Apfelbaum:
    #2 "pc & q35: Add new machine opt max-ram-below-4g":
       Added setting of .default_machine_opts to include max-ram-below-4g
         for all pc types.
       Removed gigabyte_align.
       Added warning on small value.
       "less then" to "less than"

  #3 "xen-hvm: Pass is_default to xen_hvm_init":
    Changed to work with the changes in #2:
      Added max_ram_below_4g_changed in order to know if it is a default value
      or a user specified one.
    Added "assert(pc_machine->max_ram_below_4g_changed > 0)" so that
      "make check" will abort on default not set for any of the pc or
      q35 machine types.
    Dropped "Acked-by: Stefano Stabellin" do to bigger change.


Changes v4 to v5:
  Re-work based on:

  https://github.com/imammedo/qemu/commits/memory-hotplug-v11

  And so it now depends on this patch set.

  Stefano Stabellini:
    #3 "xen-hvm: Pass is_default to xen_hvm_init"
      Acked-by 
      Minor change of pmc to pcms.

Changes v3 to v4:
  Split out #2 "GlobalProperty: Display warning about unused -global"
  rebase on e00fcfe (origin/master)
  rename xen-all to xen-hvm

  Adjust #1 "xen-hvm: Fix xen_hvm_init() to adjust pc memory layout"
    Switch Acked-by & Signed-off-by
    rebase on master

  Rework #3 "xen-hvm: Pass is_default to xen_hvm_init":
    To pass is_default instead of max_ram_below_4g.
    Also did not add "Acked-by: Stefano Stabellini" since code changed a lot.

  Andreas FÃrber:
    all: Remove dot at end of subject
    #3 "xen-hvm: Pass is_default to xen_hvm_init"
      Adjust comment formatting.

  Andreas FÃrber, Paolo Bonzini, Marcel Apfelbaum:
    rework to use "opts per machine"
    Drop old #3, new #2.
  

Changes v2 to v3:
  Stefano Stabellini:
    Acked-by #1 "xen-all: Fix xen_hvm_init() to adjust pc memory"
    Adjust for code readability #4 "xen-all: Pass max_ram_below_4g to 
xen_hvm_init."
       Set max_ram_below_4g always and use it to calculate above_4g_mem_size,
       below_4g_mem_size.

Changes v1 to v2:
  Michael S. Tsirkin:
    Rename option.
    Only add it to machine types that support it.
  Split into 4 parts.

1/4 -- xen-all: Fix xen_hvm_init() to adjust pc memory layout

  This looks to be a possible bug that has yet to be found.
  below_4g_mem_size and above_4g_mem_size are stored in PcGuestInfo
  (pc_guest_info_init) which are currently not "correct".  This and
  4/4 change the same lines.

2/4 -- GlobalProperty: Display warning about unused -global

    My testing showed that setting a global property on an object
    that is not used is not reported at all.  This is added to help
    when the new global is set but not used.  The negative not_used
    was picked so that all static objects are assumed to be used
    even when they are not.

3/4 -- pc & q35: Add new object pc-memory-layout

  The objects that it might make sense to add this property to all
  get created too late.  So add a new object just to hold this
  property.  Name it so that it is expected that only pc (and q35)
  machine types support it.

4/4 -- xen-all: Pass max_ram_below_4g to xen_hvm_init

  Seprate the xen only part of the change.  Currectly based on patch 1/4

Don Slutz (3):
  xen-hvm: Fix xen_hvm_init() to adjust pc memory layout
  pc & q35: Add new machine opt max-ram-below-4g
  xen-hvm: Handle machine opt max-ram-below-4g

 hw/i386/pc.c         | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 hw/i386/pc_piix.c    | 53 ++++++++++++++++++++++++++++++++++++----------------
 hw/i386/pc_q35.c     | 51 +++++++++++++++++++++++++++++++++++---------------
 include/hw/i386/pc.h |  3 +++
 include/hw/xen/xen.h |  3 ++-
 vl.c                 |  4 ++++
 xen-hvm-stub.c       |  3 ++-
 xen-hvm.c            | 53 +++++++++++++++++++++++++++++++++-------------------
 8 files changed, 165 insertions(+), 52 deletions(-)

-- 
1.8.4


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