[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 4/4] s390x/cpu: Allow hotplug of CPUs
From: |
Matthew Rosato |
Subject: |
[Qemu-devel] [PATCH 4/4] s390x/cpu: Allow hotplug of CPUs |
Date: |
Mon, 9 Nov 2015 10:17:40 -0500 |
Implement cpu hotplug routine and add the machine hook.
Signed-off-by: Matthew Rosato <address@hidden>
Reviewed-by: David Hildenbrand <address@hidden>
---
hw/s390x/s390-virtio-ccw.c | 1 +
target-s390x/cpu.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
target-s390x/cpu.h | 1 +
3 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 7561e18..cfcde8d 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -163,6 +163,7 @@ static void ccw_machine_class_init(ObjectClass *oc, void
*data)
mc->init = ccw_init;
mc->reset = s390_machine_reset;
+ mc->hot_add_cpu = s390_hot_add_cpu;
mc->block_default_type = IF_VIRTIO;
mc->no_cdrom = 1;
mc->no_floppy = 1;
diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
index 3228c3b..48ecd34 100644
--- a/target-s390x/cpu.c
+++ b/target-s390x/cpu.c
@@ -31,11 +31,17 @@
#include "trace.h"
#ifndef CONFIG_USER_ONLY
#include "sysemu/arch_init.h"
+#include "hw/boards.h"
+#include "hw/s390x/sclp.h"
+#include "sysemu/sysemu.h"
#endif
#define CR0_RESET 0xE0UL
#define CR14_RESET 0xC2000000UL;
+/* Older kernels require CPUs to be added sequentially by id */
+int next_cpu_id;
+
/* generate CPU information for cpu -? */
void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
{
@@ -204,6 +210,12 @@ static void s390_cpu_realizefn(DeviceState *dev, Error
**errp)
#endif
scc->parent_realize(dev, errp);
+
+#if !defined(CONFIG_USER_ONLY)
+ if (dev->hotplugged) {
+ raise_irq_cpu_hotplug();
+ }
+#endif
}
static void s390_cpu_initfn(Object *obj)
@@ -212,7 +224,6 @@ static void s390_cpu_initfn(Object *obj)
S390CPU *cpu = S390_CPU(obj);
CPUS390XState *env = &cpu->env;
static bool inited;
- static int cpu_num = 0;
#if !defined(CONFIG_USER_ONLY)
struct tm tm;
#endif
@@ -221,7 +232,7 @@ static void s390_cpu_initfn(Object *obj)
cs->halted = 1;
cs->exception_index = EXCP_HLT;
cpu_exec_init(cs, &error_abort);
- env->cpu_num = cpu_num++;
+ env->cpu_num = next_cpu_id++;
#if !defined(CONFIG_USER_ONLY)
qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
qemu_get_timedate(&tm, 0);
@@ -251,6 +262,36 @@ static void s390_cpu_finalize(Object *obj)
}
#if !defined(CONFIG_USER_ONLY)
+void s390_hot_add_cpu(const int64_t id, Error **errp)
+{
+ MachineState *machine = MACHINE(qdev_get_machine());
+
+ if (id < 0) {
+ error_setg(errp, "Invalid CPU id: %" PRIi64, id);
+ return;
+ }
+
+ if (cpu_exists(id)) {
+ error_setg(errp, "Unable to add CPU: %" PRIi64
+ ", it already exists", id);
+ return;
+ }
+
+ if (id >= max_cpus) {
+ error_setg(errp, "Unable to add CPU: %" PRIi64
+ ", max allowed: %d", id, max_cpus - 1);
+ return;
+ }
+
+ if (id != next_cpu_id) {
+ error_setg(errp, "Unable to add CPU: %" PRIi64
+ ", The next available id is %d", id, next_cpu_id);
+ return;
+ }
+
+ cpu_s390x_init(machine->cpu_model);
+}
+
static bool disabled_wait(CPUState *cpu)
{
return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 803841b..99daf79 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -542,6 +542,7 @@ static inline uint8_t s390_cpu_get_state(S390CPU *cpu)
void gtod_save(QEMUFile *f, void *opaque);
int gtod_load(QEMUFile *f, void *opaque, int version_id);
+void s390_hot_add_cpu(const int64_t id, Error **errp);
/* service interrupts are floating therefore we must not pass an cpustate */
void s390_sclp_extint(uint32_t parm);
--
1.9.1