Re: [Xen-devel] [Qemu-devel] [PATCH v3 0/4] Add max-ram-below-4g (was Add pci_hole_min_size machine option)

[Don Slutz <dslutz@xxxxxxxxxxx>]

On 05/05/14 04:12, Michael S. Tsirkin wrote:
> On Tue, Apr 22, 2014 at 12:31:16PM -0400, Don Slutz wrote:
> > On 04/18/14 10:10, Andreas Färber wrote:
> > > Am 25.03.2014 10:08, schrieb Michael S. Tsirkin:
> > > > On Mon, Mar 24, 2014 at 07:55:32PM -0400, Don Slutz wrote:
> > > > > 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 (4):
> > > > >    xen-all: Fix xen_hvm_init() to adjust pc memory layout.
> > > > >    GlobalProperty: Display warning about unused -global
> > > > >    pc & q35: Add new object pc-memory-layout.
> > > > >    xen-all: Pass max_ram_below_4g to xen_hvm_init.
> > > > >
> > > > >   hw/core/qdev-properties-system.c |  1 +
> > > > >   hw/core/qdev-properties.c        | 15 ++++++++++++
> > > > >   hw/i386/pc.c                     | 42 ++++++++++++++++++++++++++++++++
> > > > >   hw/i386/pc_piix.c                | 52 +++++++++++++++++++++++++++-------------
> > > > >   hw/i386/pc_q35.c                 | 50 ++++++++++++++++++++++++++------------
> > > > >   include/hw/i386/pc.h             |  2 ++
> > > > >   include/hw/qdev-core.h           |  1 +
> > > > >   include/hw/qdev-properties.h     |  1 +
> > > > >   include/hw/xen/xen.h             |  3 ++-
> > > > >   vl.c                             |  2 ++
> > > > >   xen-all.c                        | 46 +++++++++++++++++++----------------
> > > > >   xen-stub.c                       |  3 ++-
> > > > >   12 files changed, 165 insertions(+), 53 deletions(-)
> > > > Andreas, could you review pls, esp patch 2?
> > > Michael, I don't see a dependency of the later patches on 2/4, so I'd
> > > like to split that one out of this series and reiterate.
> > I am happy to split out 2/4.
> I'm waiting for a repost or did I misunderstand?
Sorry about that.  No you did not misunderstand.  I was looking into how to do
patches 3 & 4.  Also I was still thinking about points that Andreas Färber had
stated.

I should be sending one out soon.

   -Don Slutz

> > > I'll have some minor comments on the rest.
> > >
> > > Don, in general please do not end subjects with a dot.
> > Ok, will attempt to do so.
> >
> >     -Don Slutz
> >
> > > CC'ing Eduardo and Igor who looked into 4G issues previously.
> > >
> > > Regards,
> > > Andreas

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