[RFC PATCH 1/1] ppc/spapr: Add hotplugged flag on DIMM LMBs on drmem_v2

[Leonardo Bras]

On reboot, all memory that was previously added using object_add and
device_add is placed in this DIMM area.

The new SPAPR_LMB_FLAGS_HOTPLUGGED flag helps Linux to put this memory in
the correct memory zone, so no unmovable allocations are made there,
allowing the object to be easily hot-removed by device_del and
object_del.

Signed-off-by: Leonardo Bras <address@hidden>

---
The new flag was already proposed on Power Architecture documentation,
and it's waiting for approval.

I would like to get your comments on this change, but it's still not
ready for being merged.

Matching Linux change is here:
http://patchwork.ozlabs.org/patch/1249917/
---
 hw/ppc/spapr.c         | 3 ++-
 include/hw/ppc/spapr.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index cc10798be4..01611b7953 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -699,7 +699,8 @@ static int spapr_populate_drmem_v2(SpaprMachineState 
*spapr, void *fdt,
         g_assert(drc);
         elem = spapr_get_drconf_cell(size / lmb_size, addr,
                                      spapr_drc_index(drc), node,
-                                     SPAPR_LMB_FLAGS_ASSIGNED);
+                                     (SPAPR_LMB_FLAGS_ASSIGNED |
+                                      SPAPR_LMB_FLAGS_HOTPLUGGED);
         QSIMPLEQ_INSERT_TAIL(&drconf_queue, elem, entry);
         nr_entries++;
         cur_addr = addr + size;
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 09110961a5..64a138d4d4 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -870,6 +870,7 @@ int spapr_rtc_import_offset(SpaprRtcState *rtc, int64_t 
legacy_offset);
 #define SPAPR_LMB_FLAGS_ASSIGNED 0x00000008
 #define SPAPR_LMB_FLAGS_DRC_INVALID 0x00000020
 #define SPAPR_LMB_FLAGS_RESERVED 0x00000080
+#define SPAPR_LMB_FLAGS_HOTPLUGGED 0x00000100
 
 void spapr_do_system_reset_on_cpu(CPUState *cs, run_on_cpu_data arg);
 
-- 
2.24.1