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qemu/hw/s390-virtio.c
Heinz Graalfs 559a17a143 s390: sclp event support 
Several SCLP features are considered to be events. Those events don't
provide SCLP commands on their own, instead they are all based on
Read Event Data, Write Event Data, Write Event Mask and the service
interrupt. Follow-on patches will provide SCLP's Signal Quiesce (via
system_powerdown) and the ASCII console.
Further down the road the sclp line mode console and configuration
change events (e.g. cpu hotplug) can be implemented.

Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-29 19:41:56 +01:00

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/*
* QEMU S390 virtio target
*
* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
*
* 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.
*
* 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.h"
#include "block.h"
#include "blockdev.h"
#include "sysemu.h"
#include "net.h"
#include "boards.h"
#include "monitor.h"
#include "loader.h"
#include "elf.h"
#include "hw/virtio.h"
#include "hw/sysbus.h"
#include "kvm.h"
#include "exec-memory.h"
#include "hw/s390-virtio-bus.h"
#include "hw/s390x/sclp.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 KVM_S390_VIRTIO_NOTIFY 0
#define KVM_S390_VIRTIO_RESET 1
#define KVM_S390_VIRTIO_SET_STATUS 2
#define KERN_IMAGE_START 0x010000UL
#define KERN_PARM_AREA 0x010480UL
#define INITRD_START 0x800000UL
#define INITRD_PARM_START 0x010408UL
#define INITRD_PARM_SIZE 0x010410UL
#define PARMFILE_START 0x001000UL
#define ZIPL_START 0x009000UL
#define ZIPL_LOAD_ADDR 0x009000UL
#define ZIPL_FILENAME "s390-zipl.rom"
#define MAX_BLK_DEVS 10
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];
}
int s390_virtio_hypercall(CPUS390XState *env, uint64_t mem, uint64_t hypercall)
{
int r = 0, i;
dprintf("KVM hypercall: %ld\n", hypercall);
switch (hypercall) {
case KVM_S390_VIRTIO_NOTIFY:
if (mem > ram_size) {
VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
mem, &i);
if (dev) {
virtio_queue_notify(dev->vdev, i);
} else {
r = -EINVAL;
}
} else {
/* Early printk */
}
break;
case KVM_S390_VIRTIO_RESET:
{
VirtIOS390Device *dev;
dev = s390_virtio_bus_find_mem(s390_bus, mem);
virtio_reset(dev->vdev);
stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
s390_virtio_device_sync(dev);
s390_virtio_reset_idx(dev);
break;
}
case KVM_S390_VIRTIO_SET_STATUS:
{
VirtIOS390Device *dev;
dev = s390_virtio_bus_find_mem(s390_bus, mem);
if (dev) {
s390_virtio_device_update_status(dev);
} else {
r = -EINVAL;
}
break;
}
default:
r = -EINVAL;
break;
}
return r;
}
/*
* The number of running CPUs. On s390 a shutdown is the state of all CPUs
* being either stopped or disabled (for interrupts) waiting. We have to
* track this number to call the shutdown sequence accordingly. This
* number is modified either on startup or while holding the big qemu lock.
*/
static unsigned s390_running_cpus;
void s390_add_running_cpu(CPUS390XState *env)
{
if (env->halted) {
s390_running_cpus++;
env->halted = 0;
env->exception_index = -1;
}
}
unsigned s390_del_running_cpu(CPUS390XState *env)
{
if (env->halted == 0) {
assert(s390_running_cpus >= 1);
s390_running_cpus--;
env->halted = 1;
env->exception_index = EXCP_HLT;
}
return s390_running_cpus;
}
/* PC hardware initialisation */
static void s390_init(QEMUMachineInitArgs *args)
{
ram_addr_t my_ram_size = args->ram_size;
ram_addr_t ram_size = args->ram_size;
const char *cpu_model = args->cpu_model;
const char *kernel_filename = args->kernel_filename;
const char *kernel_cmdline = args->kernel_cmdline;
const char *initrd_filename = args->initrd_filename;
CPUS390XState *env = NULL;
MemoryRegion *sysmem = get_system_memory();
MemoryRegion *ram = g_new(MemoryRegion, 1);
ram_addr_t kernel_size = 0;
ram_addr_t initrd_offset;
ram_addr_t initrd_size = 0;
int shift = 0;
uint8_t *storage_keys;
void *virtio_region;
hwaddr virtio_region_len;
hwaddr virtio_region_start;
int i;
/* s390x ram size detection needs a 16bit multiplier + an increment. So
guests > 64GB can be specified in 2MB steps etc. */
while ((my_ram_size >> (20 + shift)) > 65535) {
shift++;
}
my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
/* lets propagate the changed ram size into the global variable. */
ram_size = my_ram_size;
/* get a BUS */
s390_bus = s390_virtio_bus_init(&my_ram_size);
s390_sclp_init();
/* allocate RAM */
memory_region_init_ram(ram, "s390.ram", my_ram_size);
vmstate_register_ram_global(ram);
memory_region_add_subregion(sysmem, 0, ram);
/* 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);
/* allocate storage keys */
storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
/* init CPUs */
if (cpu_model == NULL) {
cpu_model = "host";
}
ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
for (i = 0; i < smp_cpus; i++) {
S390CPU *cpu;
CPUS390XState *tmp_env;
cpu = cpu_s390x_init(cpu_model);
tmp_env = &cpu->env;
if (!env) {
env = tmp_env;
}
ipi_states[i] = cpu;
tmp_env->halted = 1;
tmp_env->exception_index = EXCP_HLT;
tmp_env->storage_keys = storage_keys;
}
/* One CPU has to run */
s390_add_running_cpu(env);
if (kernel_filename) {
kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, NULL,
NULL, 1, ELF_MACHINE, 0);
if (kernel_size == -1UL) {
kernel_size = load_image_targphys(kernel_filename, 0, ram_size);
}
if (kernel_size == -1UL) {
fprintf(stderr, "qemu: could not load kernel '%s'\n",
kernel_filename);
exit(1);
}
/*
* we can not rely on the ELF entry point, since up to 3.2 this
* value was 0x800 (the SALIPL loader) and it wont work. For
* all (Linux) cases 0x10000 (KERN_IMAGE_START) should be fine.
*/
env->psw.addr = KERN_IMAGE_START;
env->psw.mask = 0x0000000180000000ULL;
} else {
ram_addr_t bios_size = 0;
char *bios_filename;
/* Load zipl bootloader */
if (bios_name == NULL) {
bios_name = ZIPL_FILENAME;
}
bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
bios_size = load_image_targphys(bios_filename, ZIPL_LOAD_ADDR, 4096);
g_free(bios_filename);
if ((long)bios_size < 0) {
hw_error("could not load bootloader '%s'\n", bios_name);
}
if (bios_size > 4096) {
hw_error("stage1 bootloader is > 4k\n");
}
env->psw.addr = ZIPL_START;
env->psw.mask = 0x0000000180000000ULL;
}
if (initrd_filename) {
initrd_offset = INITRD_START;
while (kernel_size + 0x100000 > initrd_offset) {
initrd_offset += 0x100000;
}
initrd_size = load_image_targphys(initrd_filename, initrd_offset,
ram_size - initrd_offset);
if (initrd_size == -1UL) {
fprintf(stderr, "qemu: could not load initrd '%s'\n",
initrd_filename);
exit(1);
}
/* we have to overwrite values in the kernel image, which are "rom" */
stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
}
if (rom_ptr(KERN_PARM_AREA)) {
/* we have to overwrite values in the kernel image, which are "rom" */
memcpy(rom_ptr(KERN_PARM_AREA), kernel_cmdline,
strlen(kernel_cmdline) + 1);
}
/* Create VirtIO network adapters */
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((BusState *)s390_bus, "virtio-net-s390");
qdev_set_nic_properties(dev, nd);
qdev_init_nofail(dev);
}
/* Create VirtIO disk drives */
for(i = 0; i < MAX_BLK_DEVS; i++) {
DriveInfo *dinfo;
DeviceState *dev;
dinfo = drive_get(IF_IDE, 0, i);
if (!dinfo) {
continue;
}
dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
qdev_init_nofail(dev);
}
}
static QEMUMachine s390_machine = {
.name = "s390-virtio",
.alias = "s390",
.desc = "VirtIO based S390 machine",
.init = s390_init,
.no_cdrom = 1,
.no_floppy = 1,
.no_serial = 1,
.no_parallel = 1,
.no_sdcard = 1,
.use_virtcon = 1,
.max_cpus = 255,
.is_default = 1,
};
static void s390_machine_init(void)
{
qemu_register_machine(&s390_machine);
}
machine_init(s390_machine_init);
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