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qemu/hw/s390x/s390-virtio.c
David Hildenbrand 1cd4e0f6f0 s390x/cmma: clean up cmma reset 
The cmma reset is per VM, so we don't need a cpu object. We can
directly make use of kvm_state, as it is already available when
the reset is called. By moving the cmma reset in our machine reset
function, we can avoid a manual reset handler.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2015-10-21 12:21:30 +02:00

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/*
* QEMU S390 virtio target
*
* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
* Copyright IBM Corp 2012
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* Contributions after 2012-10-29 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*
* You should have received a copy of the GNU (Lesser) General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hw/hw.h"
#include "qapi/qmp/qerror.h"
#include "qemu/error-report.h"
#include "sysemu/block-backend.h"
#include "sysemu/blockdev.h"
#include "sysemu/sysemu.h"
#include "net/net.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "hw/virtio/virtio.h"
#include "hw/sysbus.h"
#include "sysemu/kvm.h"
#include "exec/address-spaces.h"
#include "hw/s390x/s390-virtio-bus.h"
#include "hw/s390x/sclp.h"
#include "hw/s390x/s390_flic.h"
#include "hw/s390x/s390-virtio.h"
#include "hw/s390x/storage-keys.h"
#include "hw/s390x/ipl.h"
#include "cpu.h"
//#define DEBUG_S390
#ifdef DEBUG_S390
#define DPRINTF(fmt, ...) \
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
#define MAX_BLK_DEVS 10
#define ZIPL_FILENAME "s390-zipl.rom"
#define S390_MACHINE "s390-virtio"
#define TYPE_S390_MACHINE MACHINE_TYPE_NAME(S390_MACHINE)
#define S390_TOD_CLOCK_VALUE_MISSING 0x00
#define S390_TOD_CLOCK_VALUE_PRESENT 0x01
static VirtIOS390Bus *s390_bus;
static S390CPU **ipi_states;
S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
{
if (cpu_addr >= smp_cpus) {
return NULL;
}
return ipi_states[cpu_addr];
}
static int s390_virtio_hcall_notify(const uint64_t *args)
{
uint64_t mem = args[0];
int r = 0, i;
if (mem > ram_size) {
VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
if (dev) {
/*
* Older kernels will use the virtqueue before setting DRIVER_OK.
* In this case the feature bits are not yet up to date, meaning
* that several funny things can happen, e.g. the guest thinks
* EVENT_IDX is on and QEMU thinks it is off. Let's force a feature
* and status sync.
*/
if (!(dev->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
s390_virtio_device_update_status(dev);
}
virtio_queue_notify(dev->vdev, i);
} else {
r = -EINVAL;
}
} else {
/* Early printk */
}
return r;
}
static int s390_virtio_hcall_reset(const uint64_t *args)
{
uint64_t mem = args[0];
VirtIOS390Device *dev;
dev = s390_virtio_bus_find_mem(s390_bus, mem);
if (dev == NULL) {
return -EINVAL;
}
virtio_reset(dev->vdev);
address_space_stb(&address_space_memory,
dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0,
MEMTXATTRS_UNSPECIFIED, NULL);
s390_virtio_device_sync(dev);
s390_virtio_reset_idx(dev);
return 0;
}
static int s390_virtio_hcall_set_status(const uint64_t *args)
{
uint64_t mem = args[0];
int r = 0;
VirtIOS390Device *dev;
dev = s390_virtio_bus_find_mem(s390_bus, mem);
if (dev) {
s390_virtio_device_update_status(dev);
} else {
r = -EINVAL;
}
return r;
}
static void s390_virtio_register_hcalls(void)
{
s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
s390_virtio_hcall_notify);
s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
s390_virtio_hcall_reset);
s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
s390_virtio_hcall_set_status);
}
void s390_init_ipl_dev(const char *kernel_filename,
const char *kernel_cmdline,
const char *initrd_filename,
const char *firmware,
bool enforce_bios)
{
DeviceState *dev;
dev = qdev_create(NULL, "s390-ipl");
if (kernel_filename) {
qdev_prop_set_string(dev, "kernel", kernel_filename);
}
if (initrd_filename) {
qdev_prop_set_string(dev, "initrd", initrd_filename);
}
qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
qdev_prop_set_string(dev, "firmware", firmware);
qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
object_property_add_child(qdev_get_machine(), "s390-ipl",
OBJECT(dev), NULL);
qdev_init_nofail(dev);
}
void s390_init_cpus(const char *cpu_model)
{
int i;
if (cpu_model == NULL) {
cpu_model = "host";
}
ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
for (i = 0; i < smp_cpus; i++) {
S390CPU *cpu;
CPUState *cs;
cpu = cpu_s390x_init(cpu_model);
cs = CPU(cpu);
ipi_states[i] = cpu;
cs->halted = 1;
cs->exception_index = EXCP_HLT;
}
}
void s390_create_virtio_net(BusState *bus, const char *name)
{
int i;
for (i = 0; i < nb_nics; i++) {
NICInfo *nd = &nd_table[i];
DeviceState *dev;
if (!nd->model) {
nd->model = g_strdup("virtio");
}
if (strcmp(nd->model, "virtio")) {
fprintf(stderr, "S390 only supports VirtIO nics\n");
exit(1);
}
dev = qdev_create(bus, name);
qdev_set_nic_properties(dev, nd);
qdev_init_nofail(dev);
}
}
void gtod_save(QEMUFile *f, void *opaque)
{
uint64_t tod_low;
uint8_t tod_high;
int r;
r = s390_get_clock(&tod_high, &tod_low);
if (r) {
fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
"Error code %d. Guest clock will not be migrated "
"which could cause the guest to hang.\n", r);
qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
return;
}
qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
qemu_put_byte(f, tod_high);
qemu_put_be64(f, tod_low);
}
int gtod_load(QEMUFile *f, void *opaque, int version_id)
{
uint64_t tod_low;
uint8_t tod_high;
int r;
if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
"cause the guest to hang.\n");
return 0;
}
tod_high = qemu_get_byte(f);
tod_low = qemu_get_be64(f);
r = s390_set_clock(&tod_high, &tod_low);
if (r) {
fprintf(stderr, "WARNING: Unable to set guest clock value. "
"s390_get_clock returned error %d. This could cause "
"the guest to hang.\n", r);
}
return 0;
}
/* PC hardware initialisation */
static void s390_init(MachineState *machine)
{
ram_addr_t my_ram_size;
void *virtio_region;
hwaddr virtio_region_len;
hwaddr virtio_region_start;
if (machine->ram_slots) {
error_report("Memory hotplug not supported by the selected machine.");
exit(EXIT_FAILURE);
}
s390_sclp_init();
my_ram_size = machine->ram_size;
/* get a BUS */
s390_bus = s390_virtio_bus_init(&my_ram_size);
s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
machine->initrd_filename, ZIPL_FILENAME, false);
s390_flic_init();
/* register hypercalls */
s390_virtio_register_hcalls();
/* allocate RAM */
s390_memory_init(my_ram_size);
/* clear virtio region */
virtio_region_len = my_ram_size - ram_size;
virtio_region_start = ram_size;
virtio_region = cpu_physical_memory_map(virtio_region_start,
&virtio_region_len, true);
memset(virtio_region, 0, virtio_region_len);
cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
virtio_region_len);
/* init CPUs */
s390_init_cpus(machine->cpu_model);
/* Create VirtIO network adapters */
s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
/* Register savevm handler for guest TOD clock */
register_savevm(NULL, "todclock", 0, 1, gtod_save, gtod_load, NULL);
}
void s390_nmi(NMIState *n, int cpu_index, Error **errp)
{
CPUState *cs = qemu_get_cpu(cpu_index);
if (s390_cpu_restart(S390_CPU(cs))) {
error_setg(errp, QERR_UNSUPPORTED);
}
}
void s390_machine_reset(void)
{
S390CPU *ipl_cpu = S390_CPU(qemu_get_cpu(0));
qemu_devices_reset();
s390_cmma_reset();
s390_crypto_reset();
/* all cpus are stopped - configure and start the ipl cpu only */
s390_ipl_prepare_cpu(ipl_cpu);
s390_cpu_set_state(CPU_STATE_OPERATING, ipl_cpu);
}
static void s390_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
NMIClass *nc = NMI_CLASS(oc);
mc->alias = "s390";
mc->desc = "VirtIO based S390 machine";
mc->init = s390_init;
mc->reset = s390_machine_reset;
mc->block_default_type = IF_VIRTIO;
mc->max_cpus = 255;
mc->no_serial = 1;
mc->no_parallel = 1;
mc->use_virtcon = 1;
mc->no_floppy = 1;
mc->no_cdrom = 1;
mc->no_sdcard = 1;
nc->nmi_monitor_handler = s390_nmi;
}
static const TypeInfo s390_machine_info = {
.name = TYPE_S390_MACHINE,
.parent = TYPE_MACHINE,
.class_init = s390_machine_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_NMI },
{ }
},
};
static void s390_machine_register_types(void)
{
type_register_static(&s390_machine_info);
}
type_init(s390_machine_register_types)
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