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qemu-e2k/hw/s390-virtio.c
Christian Borntraeger 1edb493490 s390: Rework kernel loading: supports elf and newer kernels 
This reworks the image loading on s390.

Newer kernels will not always have a 0dd0 (basr 13,0) at address 0x10000.
We must not rely on specific code at certain  addresses. This check was
introduced to warn users that tried to load vmlinux, since ELF loading
was not supported. Lets wire that up. If elf loading fails, we assume
that this is a standard kernel image and load that via load_image_targphys.
This patch also changes all other users of load_image to
load_image_targphys to be consistent. (the elf loader registers the kernel
as rom).

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2012-03-05 19:51:18 +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"
//#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 CPUState **ipi_states;
CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
{
if (cpu_addr >= smp_cpus) {
return NULL;
}
return ipi_states[cpu_addr];
}
int s390_virtio_hypercall(CPUState *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);
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(CPUState *env)
{
if (env->halted) {
s390_running_cpus++;
env->halted = 0;
env->exception_index = -1;
}
}
unsigned s390_del_running_cpu(CPUState *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(ram_addr_t my_ram_size,
const char *boot_device,
const char *kernel_filename,
const char *kernel_cmdline,
const char *initrd_filename,
const char *cpu_model)
{
CPUState *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;
target_phys_addr_t virtio_region_len;
target_phys_addr_t 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);
/* 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(CPUState *) * smp_cpus);
for (i = 0; i < smp_cpus; i++) {
CPUState *tmp_env;
tmp_env = cpu_init(cpu_model);
if (!env) {
env = tmp_env;
}
ipi_states[i] = tmp_env;
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);
}
/*
* 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);
/* we have to overwrite values in the kernel image, which are "rom" */
memcpy(rom_ptr(INITRD_PARM_START), &initrd_offset, 8);
memcpy(rom_ptr(INITRD_PARM_SIZE), &initrd_size, 8);
}
if (kernel_cmdline) {
/* 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_serial = 1,
.no_parallel = 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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