[Qemu-devel] [PATCH 1/5] Add the standby-mem machine option

[Matthew Rosato <mjrosato@linux.vnet.ibm.com>]

Add the machine=...,standby-mem={size} option and associated
documentation.

Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
---
 qemu-options.hx |    6 +++++-
 vl.c            |    6 ++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index af34483..def4493 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -35,7 +35,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
     "                kernel_irqchip=on|off controls accelerated irqchip support\n"
     "                kvm_shadow_mem=size of KVM shadow MMU\n"
     "                dump-guest-core=on|off include guest memory in a core dump (default=on)\n"
-    "                mem-merge=on|off controls memory merge support (default: on)\n",
+    "                mem-merge=on|off controls memory merge support (default: on)\n"
+    "                standby-mem=size sets size of additional offline memory\n",
     QEMU_ARCH_ALL)
 STEXI
 @item -machine [type=]@var{name}[,prop=@var{value}[,...]]
@@ -58,6 +59,9 @@ Include guest memory in a core dump. The default is on.
 Enables or disables memory merge support. This feature, when supported by
 the host, de-duplicates identical memory pages among VMs instances
 (enabled by default).
+@item standby-mem=size
+Defines the size, in megabytes, of additional memory to be left offline for
+future hotplug by the guest.
 @end table
 ETEXI
 
diff --git a/vl.c b/vl.c
index b0399de..7d58d24 100644
--- a/vl.c
+++ b/vl.c
@@ -187,6 +187,7 @@ DisplayType display_type = DT_DEFAULT;
 static int display_remote;
 const char* keyboard_layout = NULL;
 ram_addr_t ram_size;
+ram_addr_t standby_mem_size;
 const char *mem_path = NULL;
 int mem_prealloc = 0; /* force preallocation of physical target memory */
 int nb_nics;
@@ -430,6 +431,10 @@ static QemuOptsList qemu_machine_opts = {
             .name = "firmware",
             .type = QEMU_OPT_STRING,
             .help = "firmware image",
+        },{
+            .name = "standby-mem",
+            .type = QEMU_OPT_SIZE,
+            .help = "standby memory size",
         },
         { /* End of list */ }
     },
@@ -2906,6 +2911,7 @@ int main(int argc, char **argv, char **envp)
     machine = find_default_machine();
     cpu_model = NULL;
     ram_size = 0;
+    standby_mem_size = 0;
     snapshot = 0;
     cyls = heads = secs = 0;
     translation = BIOS_ATA_TRANSLATION_AUTO;
-- 
1.7.9.5