spapr: Support ibm, lrdr-capacity device tree property

Add support for ibm,lrdr-capacity since this is needed by the guest
kernel to know about the possible hot-pluggable CPUs and Memory. With
this, pseries kernels will start reporting correct maxcpus in
/sys/devices/system/cpu/possible.

Also define the minimum hotpluggable memory size as 256MB.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[agraf: Fix compile error on 32bit hosts]
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
index 3b95dfc6de..2986f94f03 100644
--- a/hw/ppc/spapr_rtas.c
+++ b/hw/ppc/spapr_rtas.c
@@ -29,6 +29,7 @@
 #include "sysemu/char.h"
 #include "hw/qdev.h"
 #include "sysemu/device_tree.h"
+#include "sysemu/cpus.h"
 
 #include "hw/ppc/spapr.h"
 #include "hw/ppc/spapr_vio.h"
@@ -651,6 +652,8 @@ int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
 {
     int ret;
     int i;
+    uint32_t lrdr_capacity[5];
+    MachineState *machine = MACHINE(qdev_get_machine());
 
     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
     if (ret < 0) {
@@ -699,6 +702,19 @@ int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
         }
 
     }
+
+    lrdr_capacity[0] = cpu_to_be32(((uint64_t)machine->maxram_size) >> 32);
+    lrdr_capacity[1] = cpu_to_be32(machine->maxram_size & 0xffffffff);
+    lrdr_capacity[2] = 0;
+    lrdr_capacity[3] = cpu_to_be32(SPAPR_MEMORY_BLOCK_SIZE);
+    lrdr_capacity[4] = cpu_to_be32(max_cpus/smp_threads);
+    ret = qemu_fdt_setprop(fdt, "/rtas", "ibm,lrdr-capacity", lrdr_capacity,
+                     sizeof(lrdr_capacity));
+    if (ret < 0) {
+        fprintf(stderr, "Couldn't add ibm,lrdr-capacity rtas property\n");
+        return ret;
+    }
+
     return 0;
 }