/*
* virtio ccw machine
*
* Copyright 2012 IBM Corp.
* Author(s): Cornelia Huck <cornelia.huck@de.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 "hw/boards.h"
#include "exec/address-spaces.h"
#include "s390-virtio.h"
#include "hw/s390x/sclp.h"
#include "hw/s390x/s390_flic.h"
#include "ioinst.h"
#include "css.h"
#include "virtio-ccw.h"
#include "qemu/config-file.h"
#define TYPE_S390_CCW_MACHINE "s390-ccw-machine"
void io_subsystem_reset(void)
{
DeviceState *css, *sclp, *flic;
css = DEVICE(object_resolve_path_type("", "virtual-css-bridge", NULL));
if (css) {
qdev_reset_all(css);
}
sclp = DEVICE(object_resolve_path_type("",
"s390-sclp-event-facility", NULL));
if (sclp) {
qdev_reset_all(sclp);
}
flic = DEVICE(object_resolve_path_type("", "s390-flic", NULL));
if (flic) {
qdev_reset_all(flic);
}
}
static int virtio_ccw_hcall_notify(const uint64_t *args)
{
uint64_t subch_id = args[0];
uint64_t queue = args[1];
SubchDev *sch;
int cssid, ssid, schid, m;
if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {
return -EINVAL;
}
sch = css_find_subch(m, cssid, ssid, schid);
if (!sch || !css_subch_visible(sch)) {
return -EINVAL;
}
if (queue >= VIRTIO_PCI_QUEUE_MAX) {
return -EINVAL;
}
virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
return 0;
}
static int virtio_ccw_hcall_early_printk(const uint64_t *args)
{
uint64_t mem = args[0];
if (mem < ram_size) {
/* Early printk */
return 0;
}
return -EINVAL;
}
static void virtio_ccw_register_hcalls(void)
{
s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY,
virtio_ccw_hcall_notify);
/* Tolerate early printk. */
s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
virtio_ccw_hcall_early_printk);
}
static void ccw_init(MachineState *machine)
{
ram_addr_t my_ram_size = machine->ram_size;
MemoryRegion *sysmem = get_system_memory();
MemoryRegion *ram = g_new(MemoryRegion, 1);
sclpMemoryHotplugDev *mhd = init_sclp_memory_hotplug_dev();
uint8_t *storage_keys;
int ret;
VirtualCssBus *css_bus;
QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL);
ram_addr_t pad_size = 0;
ram_addr_t maxmem = qemu_opt_get_size(opts, "maxmem", my_ram_size);
ram_addr_t standby_mem_size = maxmem - my_ram_size;
/* The storage increment size is a multiple of 1M and is a power of 2.
* The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
* The variable 'mhd->increment_size' is an exponent of 2 that can be
* used to calculate the size (in bytes) of an increment. */
mhd->increment_size = 20;
while ((my_ram_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) {
mhd->increment_size++;
}
while ((standby_mem_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) {
mhd->increment_size++;
}
/* The core and standby memory areas need to be aligned with
* the increment size. In effect, this can cause the
* user-specified memory size to be rounded down to align
* with the nearest increment boundary. */
standby_mem_size = standby_mem_size >> mhd->increment_size
<< mhd->increment_size;
my_ram_size = my_ram_size >> mhd->increment_size
<< mhd->increment_size;
/* let's propagate the changed ram size into the global variable. */
ram_size = my_ram_size;
/* get a BUS */
css_bus = virtual_css_bus_init();
s390_sclp_init();
s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
machine->initrd_filename, "s390-ccw.img");
s390_flic_init();
/* register hypercalls */
virtio_ccw_register_hcalls();
/* allocate RAM for core */
memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
vmstate_register_ram_global(ram);
memory_region_add_subregion(sysmem, 0, ram);
/* If the size of ram is not on a MEM_SECTION_SIZE boundary,
calculate the pad size necessary to force this boundary. */
if (standby_mem_size) {
if (my_ram_size % MEM_SECTION_SIZE) {
pad_size = MEM_SECTION_SIZE - my_ram_size % MEM_SECTION_SIZE;
}
my_ram_size += standby_mem_size + pad_size;
mhd->pad_size = pad_size;
mhd->standby_mem_size = standby_mem_size;
}
/* allocate storage keys */
storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
/* init CPUs */
s390_init_cpus(machine->cpu_model, storage_keys);
if (kvm_enabled()) {
kvm_s390_enable_css_support(s390_cpu_addr2state(0));
}
/*
* Create virtual css and set it as default so that non mcss-e
* enabled guests only see virtio devices.
*/
ret = css_create_css_image(VIRTUAL_CSSID, true);
assert(ret == 0);
/* Create VirtIO network adapters */
s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw");
}
static void ccw_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
NMIClass *nc = NMI_CLASS(oc);
mc->name = "s390-ccw-virtio";
mc->alias = "s390-ccw";
mc->desc = "VirtIO-ccw based S390 machine";
mc->init = ccw_init;
mc->block_default_type = IF_VIRTIO;
mc->no_cdrom = 1;
mc->no_floppy = 1;
mc->no_serial = 1;
mc->no_parallel = 1;
mc->no_sdcard = 1;
mc->use_sclp = 1;
mc->max_cpus = 255;
nc->nmi_monitor_handler = s390_nmi;
}
static const TypeInfo ccw_machine_info = {
.name = TYPE_S390_CCW_MACHINE,
.parent = TYPE_MACHINE,
.class_init = ccw_machine_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_NMI },
{ }
},
};
static void ccw_machine_register_types(void)
{
type_register_static(&ccw_machine_info);
}
type_init(ccw_machine_register_types)
