[Qemu-devel] [PATCH 3/15] introduce cpu_set to qemu monitor

[Glauber Costa <gcosta@redhat.com>]

in this patch, cpu_set is introduced to qemu monitor

semantics is : cpu_set x online|offline.

it will then tell the acpi backend to signal cpu x.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
---
 qemu/hw/acpi.c |    4 ++++
 qemu/monitor.c |   16 ++++++++++++++++
 qemu/sysemu.h  |    3 +++
 3 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/qemu/hw/acpi.c b/qemu/hw/acpi.c
index e21ded0..d2e2e3e 100644
--- a/qemu/hw/acpi.c
+++ b/qemu/hw/acpi.c
@@ -533,3 +533,7 @@ void qemu_system_powerdown(void)
     }
 }
 #endif
+
+void qemu_system_cpu_hot_add(int cpu, int state)
+{
+}
diff --git a/qemu/monitor.c b/qemu/monitor.c
index e8022c8..09f84a9 100644
--- a/qemu/monitor.c
+++ b/qemu/monitor.c
@@ -345,6 +345,21 @@ static void do_cpu_set(int index)
         term_printf("Invalid CPU index\n");
 }
 
+static void do_cpu_set_nr(int value, const char *status)
+{
+    int state;
+
+    if (!strcmp(status, "online"))
+       state = 1;
+    else if (!strcmp(status, "offline"))
+       state = 0;
+    else {
+       term_printf("invalid status: %s\n", status);
+       return;
+    }
+    qemu_system_cpu_hot_add(value, state);
+}
+
 static void do_info_jit(void)
 {
     dump_exec_info(NULL, monitor_fprintf);
@@ -1338,6 +1353,7 @@ #endif
       "", "cancel the current VM migration" },
     { "migrate_set_speed", "s", do_migrate_set_speed,
       "value", "set maximum speed (in bytes) for migrations" },
+    { "cpu_set", "is", do_cpu_set_nr, "cpu [online|offline]", "change cpu state" },
     { NULL, NULL, },
 };
 
diff --git a/qemu/sysemu.h b/qemu/sysemu.h
index ffc468a..fe929b4 100644
--- a/qemu/sysemu.h
+++ b/qemu/sysemu.h
@@ -153,6 +153,9 @@ int extboot_drive;
 extern int drive_get_index(BlockInterfaceType type, int bus, int unit);
 extern int drive_get_max_bus(BlockInterfaceType type);
 
+/* acpi */
+void qemu_system_cpu_hot_add(int cpu, int state);
+
 /* vmchannel devices */
 
 #define MAX_VMCHANNEL_DEVICES 4
-- 
1.4.2