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Introduce -smp , maxcpus= flag to specify maximum number of CPUS.

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Follow on patch will use it to determine the size of the MADT and
other BIOS tables.

Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jes Sorensen 2009-07-23 17:03:42 +02:00 committed by Anthony Liguori
parent 96c1606b33
commit 6be68d7eb9
5 changed files with 33 additions and 2 deletions
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1
hw/fw_cfg.c
View File

@ -279,6 +279,7 @@ void *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
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);

1
hw/fw_cfg.h
View File

@ -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

5
qemu-options.hx
View File

@ -39,7 +39,10 @@ Select CPU model (-cpu ? for list and additional feature selection)
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

1
sysemu.h
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@ -121,6 +121,7 @@ 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;

27
vl.c
View File

@ -222,6 +222,7 @@ 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;
@ -5453,12 +5454,29 @@ int main(int argc, char **argv, char **envp)
add_device_config(DEV_GENERIC, optarg);
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;
@ -5639,6 +5657,13 @@ int main(int argc, char **argv, char **envp)
}
#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 "