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

["Michael S. Tsirkin" <mst@xxxxxxxxxx>]

On Thu, Jun 19, 2014 at 09:40:23PM -0400, Don Slutz wrote:
> 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).
> 


Applied, thanks!

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