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s390-sclp: SCLP Event integration

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Add an sclp event for "cpu was hot plugged".  This allows Qemu to deliver an
SCLP interrupt to the guest stating that the requested cpu hotplug was
completed.

Signed-off-by: Jason J. Herne <jjherne@us.ibm.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Jason J. Herne 2014-01-20 14:51:50 -05:00 • committed by Christian Borntraeger
parent 8cc3aecf84
commit 492044581c
5 changed files with 125 additions and 0 deletions
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112
hw/s390x/sclpcpu.c Normal file
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/*
* SCLP event type
* Signal CPU - Trigger SCLP interrupt for system CPU configure or
* de-configure
*
* Copyright IBM, Corp. 2013
*
* Authors:
* Thang Pham <thang.pham@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at your
* option) any later version. See the COPYING file in the top-level directory.
*
*/
#include "sysemu/sysemu.h"
#include "hw/s390x/sclp.h"
#include "hw/s390x/event-facility.h"
#include "cpu.h"
#include "sysemu/cpus.h"
#include "sysemu/kvm.h"
typedef struct ConfigMgtData {
EventBufferHeader ebh;
uint8_t reserved;
uint8_t event_qualifier;
} QEMU_PACKED ConfigMgtData;
static qemu_irq irq_cpu_hotplug; /* Only used in this file */
#define EVENT_QUAL_CPU_CHANGE 1
void raise_irq_cpu_hotplug(void)
{
qemu_irq_raise(irq_cpu_hotplug);
}
static unsigned int send_mask(void)
{
return SCLP_EVENT_MASK_CONFIG_MGT_DATA;
}
static unsigned int receive_mask(void)
{
return 0;
}
static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
int *slen)
{
ConfigMgtData *cdata = (ConfigMgtData *) evt_buf_hdr;
if (*slen < sizeof(ConfigMgtData)) {
return 0;
}
/* Event is no longer pending */
if (!event->event_pending) {
return 0;
}
event->event_pending = false;
/* Event header data */
cdata->ebh.length = cpu_to_be16(sizeof(ConfigMgtData));
cdata->ebh.type = SCLP_EVENT_CONFIG_MGT_DATA;
cdata->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
/* Trigger a rescan of CPUs by setting event qualifier */
cdata->event_qualifier = EVENT_QUAL_CPU_CHANGE;
*slen -= sizeof(ConfigMgtData);
return 1;
}
static void trigger_signal(void *opaque, int n, int level)
{
SCLPEvent *event = opaque;
event->event_pending = true;
/* Trigger SCLP read operation */
sclp_service_interrupt(0);
}
static int irq_cpu_hotplug_init(SCLPEvent *event)
{
irq_cpu_hotplug = *qemu_allocate_irqs(trigger_signal, event, 1);
return 0;
}
static void cpu_class_init(ObjectClass *oc, void *data)
{
SCLPEventClass *k = SCLP_EVENT_CLASS(oc);
k->init = irq_cpu_hotplug_init;
k->get_send_mask = send_mask;
k->get_receive_mask = receive_mask;
k->read_event_data = read_event_data;
k->write_event_data = NULL;
}
static const TypeInfo sclp_cpu_info = {
.name = "sclp-cpu-hotplug",
.parent = TYPE_SCLP_EVENT,
.instance_size = sizeof(SCLPEvent),
.class_init = cpu_class_init,
.class_size = sizeof(SCLPEventClass),
};
static void sclp_cpu_register_types(void)
{
type_register_static(&sclp_cpu_info);
}
type_init(sclp_cpu_register_types)