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machine: Refactor smp_parse() in vl.c as MachineClass::smp_parse() 

To make smp_parse() more flexible and expansive, a smp_parse function
pointer is added to MachineClass that machine types could override.

The generic smp_parse() code in vl.c is moved to hw/core/machine.c, and
become the default implementation of MachineClass::smp_parse. A PC-specific
function called pc_smp_parse() has been added to hw/i386/pc.c, which in
this patch changes nothing against the default one .

Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20190620054525.37188-3-like.xu@linux.intel.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Like Xu 2019-06-20 13:45:24 +08:00 committed by Eduardo Habkost
parent a94e142899
commit 6f479566a8
5 changed files with 163 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
hw/core/machine.c
View File

@ -11,6 +11,9 @@
*/
#include "qemu/osdep.h"
#include "qemu/option.h"
#include "qapi/qmp/qerror.h"
#include "sysemu/replay.h"
#include "qemu/units.h"
#include "hw/boards.h"
#include "qapi/error.h"
@ -726,6 +729,78 @@ void machine_set_cpu_numa_node(MachineState *machine,
}
}
static void smp_parse(MachineState *ms, QemuOpts *opts)
{
if (opts) {
unsigned cpus = qemu_opt_get_number(opts, "cpus", 0);
unsigned sockets = qemu_opt_get_number(opts, "sockets", 0);
unsigned cores = qemu_opt_get_number(opts, "cores", 0);
unsigned threads = qemu_opt_get_number(opts, "threads", 0);
/* compute missing values, prefer sockets over cores over threads */
if (cpus == 0 || sockets == 0) {
cores = cores > 0 ? cores : 1;
threads = threads > 0 ? threads : 1;
if (cpus == 0) {
sockets = sockets > 0 ? sockets : 1;
cpus = cores * threads * sockets;
} else {
ms->smp.max_cpus =
qemu_opt_get_number(opts, "maxcpus", cpus);
sockets = ms->smp.max_cpus / (cores * threads);
}
} else if (cores == 0) {
threads = threads > 0 ? threads : 1;
cores = cpus / (sockets * threads);
cores = cores > 0 ? cores : 1;
} else if (threads == 0) {
threads = cpus / (cores * sockets);
threads = threads > 0 ? threads : 1;
} else if (sockets * cores * threads < cpus) {
error_report("cpu topology: "
"sockets (%u) * cores (%u) * threads (%u) < "
"smp_cpus (%u)",
sockets, cores, threads, cpus);
exit(1);
}
ms->smp.max_cpus =
qemu_opt_get_number(opts, "maxcpus", cpus);
if (ms->smp.max_cpus < cpus) {
error_report("maxcpus must be equal to or greater than smp");
exit(1);
}
if (sockets * cores * threads > ms->smp.max_cpus) {
error_report("cpu topology: "
"sockets (%u) * cores (%u) * threads (%u) > "
"maxcpus (%u)",
sockets, cores, threads,
ms->smp.max_cpus);
exit(1);
}
if (sockets * cores * threads != ms->smp.max_cpus) {
warn_report("Invalid CPU topology deprecated: "
"sockets (%u) * cores (%u) * threads (%u) "
"!= maxcpus (%u)",
sockets, cores, threads,
ms->smp.max_cpus);
}
ms->smp.cpus = cpus;
ms->smp.cores = cores;
ms->smp.threads = threads;
}
if (ms->smp.cpus > 1) {
Error *blocker = NULL;
error_setg(&blocker, QERR_REPLAY_NOT_SUPPORTED, "smp");
replay_add_blocker(blocker);
}
}
static void machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
@ -733,6 +808,7 @@ static void machine_class_init(ObjectClass *oc, void *data)
/* Default 128 MB as guest ram size */
mc->default_ram_size = 128 * MiB;
mc->rom_file_has_mr = true;
mc->smp_parse = smp_parse;
/* numa node memory size aligned on 8MB by default.
* On Linux, each node's border has to be 8MB aligned

79
hw/i386/pc.c
View File

@ -81,6 +81,8 @@
#include "standard-headers/asm-x86/bootparam.h"
#include "hw/virtio/virtio-pmem-pci.h"
#include "hw/mem/memory-device.h"
#include "sysemu/replay.h"
#include "qapi/qmp/qerror.h"
/* debug PC/ISA interrupts */
//#define DEBUG_IRQ
@ -1532,6 +1534,82 @@ static void pc_new_cpu(PCMachineState *pcms, int64_t apic_id, Error **errp)
error_propagate(errp, local_err);
}
/*
* This function is very similar to smp_parse()
* in hw/core/machine.c but includes CPU die support.
*/
void pc_smp_parse(MachineState *ms, QemuOpts *opts)
{
if (opts) {
unsigned cpus = qemu_opt_get_number(opts, "cpus", 0);
unsigned sockets = qemu_opt_get_number(opts, "sockets", 0);
unsigned cores = qemu_opt_get_number(opts, "cores", 0);
unsigned threads = qemu_opt_get_number(opts, "threads", 0);
/* compute missing values, prefer sockets over cores over threads */
if (cpus == 0 || sockets == 0) {
cores = cores > 0 ? cores : 1;
threads = threads > 0 ? threads : 1;
if (cpus == 0) {
sockets = sockets > 0 ? sockets : 1;
cpus = cores * threads * sockets;
} else {
ms->smp.max_cpus =
qemu_opt_get_number(opts, "maxcpus", cpus);
sockets = ms->smp.max_cpus / (cores * threads);
}
} else if (cores == 0) {
threads = threads > 0 ? threads : 1;
cores = cpus / (sockets * threads);
cores = cores > 0 ? cores : 1;
} else if (threads == 0) {
threads = cpus / (cores * sockets);
threads = threads > 0 ? threads : 1;
} else if (sockets * cores * threads < cpus) {
error_report("cpu topology: "
"sockets (%u) * cores (%u) * threads (%u) < "
"smp_cpus (%u)",
sockets, cores, threads, cpus);
exit(1);
}
ms->smp.max_cpus =
qemu_opt_get_number(opts, "maxcpus", cpus);
if (ms->smp.max_cpus < cpus) {
error_report("maxcpus must be equal to or greater than smp");
exit(1);
}
if (sockets * cores * threads > ms->smp.max_cpus) {
error_report("cpu topology: "
"sockets (%u) * cores (%u) * threads (%u) > "
"maxcpus (%u)",
sockets, cores, threads,
ms->smp.max_cpus);
exit(1);
}
if (sockets * cores * threads != ms->smp.max_cpus) {
warn_report("Invalid CPU topology deprecated: "
"sockets (%u) * cores (%u) * threads (%u) "
"!= maxcpus (%u)",
sockets, cores, threads,
ms->smp.max_cpus);
}
ms->smp.cpus = cpus;
ms->smp.cores = cores;
ms->smp.threads = threads;
}
if (ms->smp.cpus > 1) {
Error *blocker = NULL;
error_setg(&blocker, QERR_REPLAY_NOT_SUPPORTED, "smp");
replay_add_blocker(blocker);
}
}
void pc_hot_add_cpu(MachineState *ms, const int64_t id, Error **errp)
{
PCMachineState *pcms = PC_MACHINE(ms);
@ -2846,6 +2924,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
mc->has_hotpluggable_cpus = true;
mc->default_boot_order = "cad";
mc->hot_add_cpu = pc_hot_add_cpu;
mc->smp_parse = pc_smp_parse;
mc->block_default_type = IF_IDE;
mc->max_cpus = 255;
mc->reset = pc_machine_reset;

5
include/hw/boards.h
View File

@ -162,6 +162,10 @@ typedef struct {
* computed based on other criteria such as the host kernel capabilities.
* @numa_mem_supported:
* true if '--numa node.mem' option is supported and false otherwise
* @smp_parse:
* The function pointer to hook different machine specific functions for
* parsing "smp-opts" from QemuOpts to MachineState::CpuTopology and more
* machine specific topology fields, such as smp_dies for PCMachine.
*/
struct MachineClass {
/*< private >*/
@ -178,6 +182,7 @@ struct MachineClass {
void (*reset)(MachineState *state);
void (*hot_add_cpu)(MachineState *state, const int64_t id, Error **errp);
int (*kvm_type)(MachineState *machine, const char *arg);
void (*smp_parse)(MachineState *ms, QemuOpts *opts);
BlockInterfaceType block_default_type;
int units_per_default_bus;

1
include/hw/i386/pc.h
View File

@ -192,6 +192,7 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
void pc_cpus_init(PCMachineState *pcms);
void pc_hot_add_cpu(MachineState *ms, const int64_t id, Error **errp);
void pc_smp_parse(MachineState *ms, QemuOpts *opts);
void pc_guest_info_init(PCMachineState *pcms);

75
vl.c
View File

@ -1245,78 +1245,6 @@ static QemuOptsList qemu_smp_opts = {
},
};
static void smp_parse(QemuOpts *opts)
{
if (opts) {
unsigned cpus = qemu_opt_get_number(opts, "cpus", 0);
unsigned sockets = qemu_opt_get_number(opts, "sockets", 0);
unsigned cores = qemu_opt_get_number(opts, "cores", 0);
unsigned threads = qemu_opt_get_number(opts, "threads", 0);
/* compute missing values, prefer sockets over cores over threads */
if (cpus == 0 || sockets == 0) {
cores = cores > 0 ? cores : 1;
threads = threads > 0 ? threads : 1;
if (cpus == 0) {
sockets = sockets > 0 ? sockets : 1;
cpus = cores * threads * sockets;
} else {
current_machine->smp.max_cpus =
qemu_opt_get_number(opts, "maxcpus", cpus);
sockets = current_machine->smp.max_cpus / (cores * threads);
}
} else if (cores == 0) {
threads = threads > 0 ? threads : 1;
cores = cpus / (sockets * threads);
cores = cores > 0 ? cores : 1;
} else if (threads == 0) {
threads = cpus / (cores * sockets);
threads = threads > 0 ? threads : 1;
} else if (sockets * cores * threads < cpus) {
error_report("cpu topology: "
"sockets (%u) * cores (%u) * threads (%u) < "
"smp_cpus (%u)",
sockets, cores, threads, cpus);
exit(1);
}
current_machine->smp.max_cpus =
qemu_opt_get_number(opts, "maxcpus", cpus);
if (current_machine->smp.max_cpus < cpus) {
error_report("maxcpus must be equal to or greater than smp");
exit(1);
}
if (sockets * cores * threads > current_machine->smp.max_cpus) {
error_report("cpu topology: "
"sockets (%u) * cores (%u) * threads (%u) > "
"maxcpus (%u)",
sockets, cores, threads,
current_machine->smp.max_cpus);
exit(1);
}
if (sockets * cores * threads != current_machine->smp.max_cpus) {
warn_report("Invalid CPU topology deprecated: "
"sockets (%u) * cores (%u) * threads (%u) "
"!= maxcpus (%u)",
sockets, cores, threads,
current_machine->smp.max_cpus);
}
current_machine->smp.cpus = cpus;
current_machine->smp.cores = cores;
current_machine->smp.threads = threads;
}
if (current_machine->smp.cpus > 1) {
Error *blocker = NULL;
error_setg(&blocker, QERR_REPLAY_NOT_SUPPORTED, "smp");
replay_add_blocker(blocker);
}
}
static void realtime_init(void)
{
if (enable_mlock) {
@ -4014,7 +3942,8 @@ int main(int argc, char **argv, char **envp)
current_machine->smp.cores = 1;
current_machine->smp.threads = 1;
smp_parse(qemu_opts_find(qemu_find_opts("smp-opts"), NULL));
machine_class->smp_parse(current_machine,
qemu_opts_find(qemu_find_opts("smp-opts"), NULL));
/* sanity-check smp_cpus and max_cpus against machine_class */
if (current_machine->smp.cpus < machine_class->min_cpus) {