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[Qemu-devel] [PATCH 1/2] Introduce -smp , maxcpus= flag to specify maxim
From: |
Jes Sorensen |
Subject: |
[Qemu-devel] [PATCH 1/2] Introduce -smp , maxcpus= flag to specify maximum number of CPUS. |
Date: |
Mon, 20 Jul 2009 16:43:13 +0200 |
User-agent: |
quilt/0.47-1 |
Follow on patch will use it to determine the size of the MADT and
other BIOS tables.
Signed-off-by: Jes Sorensen <address@hidden>
---
hw/fw_cfg.c | 1 +
hw/fw_cfg.h | 1 +
qemu-options.hx | 5 ++++-
sysemu.h | 1 +
vl.c | 27 ++++++++++++++++++++++++++-
5 files changed, 33 insertions(+), 2 deletions(-)
Index: qemu/hw/fw_cfg.c
===================================================================
--- qemu.orig/hw/fw_cfg.c
+++ qemu/hw/fw_cfg.c
@@ -279,6 +279,7 @@ void *fw_cfg_init(uint32_t ctl_port, uin
fw_cfg_add_bytes(s, FW_CFG_UUID, qemu_uuid, 16);
fw_cfg_add_i16(s, FW_CFG_NOGRAPHIC, (uint16_t)(display_type ==
DT_NOGRAPHIC));
fw_cfg_add_i16(s, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
+ fw_cfg_add_i16(s, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
fw_cfg_add_i16(s, FW_CFG_BOOT_MENU, (uint16_t)boot_menu);
register_savevm("fw_cfg", -1, 1, fw_cfg_save, fw_cfg_load, s);
Index: qemu/hw/fw_cfg.h
===================================================================
--- qemu.orig/hw/fw_cfg.h
+++ qemu/hw/fw_cfg.h
@@ -16,6 +16,7 @@
#define FW_CFG_BOOT_DEVICE 0x0c
#define FW_CFG_NUMA 0x0d
#define FW_CFG_BOOT_MENU 0x0e
+#define FW_CFG_MAX_CPUS 0x0f
#define FW_CFG_MAX_ENTRY 0x10
#define FW_CFG_WRITE_CHANNEL 0x4000
Index: qemu/qemu-options.hx
===================================================================
--- qemu.orig/qemu-options.hx
+++ qemu/qemu-options.hx
@@ -39,7 +39,10 @@ Select CPU model (-cpu ? for list and ad
ETEXI
DEF("smp", HAS_ARG, QEMU_OPTION_smp,
- "-smp n set the number of CPUs to 'n' [default=1]\n")
+ "-smp n[,maxcpus=cpus]\n"
+ " set the number of CPUs to 'n' [default=1]\n"
+ " maxcpus= maximum number of total cpus, including\n"
+ " offline CPUs for hotplug etc.\n")
STEXI
@item -smp @var{n}
Simulate an SMP system with @var{n} CPUs. On the PC target, up to 255
Index: qemu/sysemu.h
===================================================================
--- qemu.orig/sysemu.h
+++ qemu/sysemu.h
@@ -119,6 +119,7 @@ extern int usb_enabled;
extern int virtio_balloon;
extern const char *virtio_balloon_devaddr;
extern int smp_cpus;
+extern int max_cpus;
extern int cursor_hide;
extern int graphic_rotate;
extern int no_quit;
Index: qemu/vl.c
===================================================================
--- qemu.orig/vl.c
+++ qemu/vl.c
@@ -227,6 +227,7 @@ int rtc_td_hack = 0;
int usb_enabled = 0;
int singlestep = 0;
int smp_cpus = 1;
+int max_cpus = 0;
const char *vnc_display;
int acpi_enabled = 1;
int no_hpet = 0;
@@ -5458,12 +5459,29 @@ int main(int argc, char **argv, char **e
usb_devices_index++;
break;
case QEMU_OPTION_smp:
- smp_cpus = atoi(optarg);
+ {
+ char *p;
+ char option[128];
+ smp_cpus = strtol(optarg, &p, 10);
if (smp_cpus < 1) {
fprintf(stderr, "Invalid number of CPUs\n");
exit(1);
}
+ if (*p++ != ',')
+ break;
+ if (get_param_value(option, 128, "maxcpus", p))
+ max_cpus = strtol(option, NULL, 0);
+ if (max_cpus < smp_cpus) {
+ fprintf(stderr, "maxcpus must be equal to or greater than "
+ "smp\n");
+ exit(1);
+ }
+ if (max_cpus > 255) {
+ fprintf(stderr, "Unsupported number of maxcpus\n");
+ exit(1);
+ }
break;
+ }
case QEMU_OPTION_vnc:
display_type = DT_VNC;
vnc_display = optarg;
@@ -5644,6 +5662,13 @@ int main(int argc, char **argv, char **e
}
#endif
+ /*
+ * Default to max_cpus = smp_cpus, in case the user doesn't
+ * specify a max_cpus value.
+ */
+ if (!max_cpus)
+ max_cpus = smp_cpus;
+
machine->max_cpus = machine->max_cpus ?: 1; /* Default to UP */
if (smp_cpus > machine->max_cpus) {
fprintf(stderr, "Number of SMP cpus requested (%d), exceeds max cpus "