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/*
* 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 "ioinst.h"
#include "css.h"
#include "virtio-ccw.h"
void io_subsystem_reset(void)
{
DeviceState *css, *sclp;
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);
}
}
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(QEMUMachineInitArgs *args)
{
ram_addr_t my_ram_size = args->ram_size;
MemoryRegion *sysmem = get_system_memory();
MemoryRegion *ram = g_new(MemoryRegion, 1);
int shift = 0;
uint8_t *storage_keys;
int ret;
VirtualCssBus *css_bus;
/* 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);
/* 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(args->kernel_filename, args->kernel_cmdline,
args->initrd_filename, "s390-ccw.img");
/* register hypercalls */
virtio_ccw_register_hcalls();
/* allocate RAM */
memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size);
vmstate_register_ram_global(ram);
memory_region_add_subregion(sysmem, 0, ram);
/* allocate storage keys */
storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
/* init CPUs */
s390_init_cpus(args->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 QEMUMachine ccw_machine = {
.name = "s390-ccw-virtio",
.alias = "s390-ccw",
.desc = "VirtIO-ccw based S390 machine",
.init = ccw_init,
.block_default_type = IF_VIRTIO,
.no_cdrom = 1,
.no_floppy = 1,
.no_serial = 1,
.no_parallel = 1,
.no_sdcard = 1,
.use_sclp = 1,
.max_cpus = 255,
};
static void ccw_machine_init(void)
{
qemu_register_machine(&ccw_machine);
}
machine_init(ccw_machine_init)
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