@@ -78,6 +78,8 @@
#include "hw/virtio/virtio-iommu.h"
#include "hw/char/pl011.h"
#include "qemu/guest-random.h"
+#include "qapi/qmp/qerror.h"
+#include "sysemu/replay.h"
#define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
@@ -2444,6 +2446,79 @@ static int virt_kvm_type(MachineState *ms, const char *type_str)
return requested_pa_size > 40 ? requested_pa_size : 0;
}
+/*
+ * Unlike smp_parse() in hw/core/machine.c, we prefer cores over sockets,
+ * e.g. '-smp 8' creates 1 socket with 8 cores. Whereas '-smp 8' with
+ * hw/core/machine.c's smp_parse() creates 8 sockets, each with 1 core.
+ * Additionally, we can enforce the topology matches max_cpus check,
+ * because we have no legacy to preserve.
+ */
+static void virt_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 cores over sockets and
+ * sockets over threads.
+ */
+ if (cpus == 0 || cores == 0) {
+ sockets = sockets > 0 ? sockets : 1;
+ threads = threads > 0 ? threads : 1;
+ if (cpus == 0) {
+ cores = cores > 0 ? cores : 1;
+ cpus = cores * threads * sockets;
+ } else {
+ ms->smp.max_cpus = qemu_opt_get_number(opts, "maxcpus", cpus);
+ cores = ms->smp.max_cpus / (sockets * threads);
+ }
+ } else if (sockets == 0) {
+ threads = threads > 0 ? threads : 1;
+ sockets = cpus / (cores * threads);
+ sockets = sockets > 0 ? sockets : 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);
+ }
+
+ ms->smp.cpus = cpus;
+ ms->smp.cores = cores;
+ ms->smp.threads = threads;
+ ms->smp.sockets = sockets;
+ }
+
+ if (ms->smp.cpus > 1) {
+ Error *blocker = NULL;
+ error_setg(&blocker, QERR_REPLAY_NOT_SUPPORTED, "smp");
+ replay_add_blocker(blocker);
+ }
+}
+
static void virt_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
@@ -2469,6 +2544,7 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
mc->cpu_index_to_instance_props = virt_cpu_index_to_props;
mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-a15");
mc->get_default_cpu_node_id = virt_get_default_cpu_node_id;
+ mc->smp_parse = virt_smp_parse;
mc->kvm_type = virt_kvm_type;
assert(!mc->get_hotplug_handler);
mc->get_hotplug_handler = virt_machine_get_hotplug_handler;