[PATCH] libxl: Specify the target ram size to Qemu (new) when calling it

[anthony.perard@citrix.com]

From: Anthony PERARD <anthony.perard@citrix.com>

This patch adds target_ram in device_model_info structure, to be used in
libxl_build_device_model_args_new. Qemu upstream needs to know about it.

It introduces also libxl__sizekb_to_mb to convert size from KB to MB by
rounding up the result.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 tools/libxl/libxl.c       |    4 ++++
 tools/libxl/libxl.idl     |    1 +
 tools/libxl/libxl_utils.h |    4 ++++
 tools/libxl/xl_cmdimpl.c  |    3 ++-
 4 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index aa28c72..9dfd211 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1384,6 +1384,10 @@ static char ** libxl_build_device_model_args_new(libxl__gc *gc,
     else
         flexarray_set(dm_args, num++, "xenfv");
 
+    /* RAM Size */
+    flexarray_set(dm_args, num++, "-m");
+    flexarray_set(dm_args, num++, libxl__sprintf(gc, "%d", info->target_ram));
+
     if (info->type == XENFV) {
         disks = libxl_device_disk_list(libxl__gc_owner(gc), info->domid, &nb);
         for (i; i < nb; i++) {
diff --git a/tools/libxl/libxl.idl b/tools/libxl/libxl.idl
index 8dd7749..89694b1 100644
--- a/tools/libxl/libxl.idl
+++ b/tools/libxl/libxl.idl
@@ -139,6 +139,7 @@ libxl_device_model_info = Struct("device_model_info",[
     ("device_model",     string),
     ("saved_state",      string),
     ("type",             libxl_qemu_machine_type),
+    ("target_ram",       uint32),
     ("videoram",         integer,           False, "size of the videoram in MB"),
     ("stdvga",           bool,              False, "stdvga enabled or disabled"),
     ("vnc",              bool,              False, "vnc enabled or disabled"),
diff --git a/tools/libxl/libxl_utils.h b/tools/libxl/libxl_utils.h
index 7846c42..940fecd 100644
--- a/tools/libxl/libxl_utils.h
+++ b/tools/libxl/libxl_utils.h
@@ -82,5 +82,9 @@ void libxl_cpumap_set(libxl_cpumap *cpumap, int cpu);
 void libxl_cpumap_reset(libxl_cpumap *cpumap, int cpu);
 #define libxl_for_each_cpu(var, map) for (var = 0; var < (map).size * 8; var++)
 
+static inline uint32_t libxl__sizekb_to_mb(uint32_t s) {
+    return (s + 1023) / 1024;
+}
+
 #endif
 
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 5555319..3718a5a 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -359,7 +359,8 @@ static void init_dm_info(libxl_device_model_info *dm_info,
 
     dm_info->dom_name = strdup(c_info->name);
     dm_info->device_model = strdup("qemu-dm");
-    dm_info->videoram = b_info->video_memkb / 1024;
+    dm_info->target_ram = libxl__sizekb_to_mb(b_info->target_memkb);
+    dm_info->videoram = libxl__sizekb_to_mb(b_info->video_memkb);
     dm_info->apic = b_info->u.hvm.apic;
     dm_info->vcpus = b_info->max_vcpus;
     dm_info->vcpu_avail = b_info->cur_vcpus;
-- 
1.7.1