2 * QEMU S390 virtio target
5 * Copyright IBM Corp 2012
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * Contributions after 2012-10-29 are licensed under the terms of the
18 * GNU GPL, version 2 or (at your option) any later version.
20 * You should have received a copy of the GNU (Lesser) General Public
21 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
25 #include "qapi/qmp/qerror.h"
26 #include "sysemu/block-backend.h"
27 #include "sysemu/blockdev.h"
28 #include "sysemu/sysemu.h"
30 #include "hw/boards.h"
31 #include "hw/loader.h"
32 #include "hw/virtio/virtio.h"
33 #include "hw/sysbus.h"
34 #include "sysemu/kvm.h"
35 #include "exec/address-spaces.h"
37 #include "hw/s390x/s390-virtio-bus.h"
38 #include "hw/s390x/sclp.h"
39 #include "hw/s390x/s390_flic.h"
40 #include "hw/s390x/s390-virtio.h"
41 #include "hw/s390x/storage-keys.h"
47 #define DPRINTF(fmt, ...) \
48 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
50 #define DPRINTF(fmt, ...) \
54 #define MAX_BLK_DEVS 10
55 #define ZIPL_FILENAME "s390-zipl.rom"
56 #define TYPE_S390_MACHINE "s390-machine"
58 #define S390_TOD_CLOCK_VALUE_MISSING 0x00
59 #define S390_TOD_CLOCK_VALUE_PRESENT 0x01
61 static VirtIOS390Bus *s390_bus;
62 static S390CPU **ipi_states;
64 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
66 if (cpu_addr >= smp_cpus) {
70 return ipi_states[cpu_addr];
73 static int s390_virtio_hcall_notify(const uint64_t *args)
75 uint64_t mem = args[0];
79 VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
82 * Older kernels will use the virtqueue before setting DRIVER_OK.
83 * In this case the feature bits are not yet up to date, meaning
84 * that several funny things can happen, e.g. the guest thinks
85 * EVENT_IDX is on and QEMU thinks it is off. Let's force a feature
88 if (!(dev->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
89 s390_virtio_device_update_status(dev);
91 virtio_queue_notify(dev->vdev, i);
101 static int s390_virtio_hcall_reset(const uint64_t *args)
103 uint64_t mem = args[0];
104 VirtIOS390Device *dev;
106 dev = s390_virtio_bus_find_mem(s390_bus, mem);
110 virtio_reset(dev->vdev);
111 address_space_stb(&address_space_memory,
112 dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0,
113 MEMTXATTRS_UNSPECIFIED, NULL);
114 s390_virtio_device_sync(dev);
115 s390_virtio_reset_idx(dev);
120 static int s390_virtio_hcall_set_status(const uint64_t *args)
122 uint64_t mem = args[0];
124 VirtIOS390Device *dev;
126 dev = s390_virtio_bus_find_mem(s390_bus, mem);
128 s390_virtio_device_update_status(dev);
135 static void s390_virtio_register_hcalls(void)
137 s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
138 s390_virtio_hcall_notify);
139 s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
140 s390_virtio_hcall_reset);
141 s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
142 s390_virtio_hcall_set_status);
145 void s390_init_ipl_dev(const char *kernel_filename,
146 const char *kernel_cmdline,
147 const char *initrd_filename,
148 const char *firmware,
153 dev = qdev_create(NULL, "s390-ipl");
154 if (kernel_filename) {
155 qdev_prop_set_string(dev, "kernel", kernel_filename);
157 if (initrd_filename) {
158 qdev_prop_set_string(dev, "initrd", initrd_filename);
160 qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
161 qdev_prop_set_string(dev, "firmware", firmware);
162 qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
163 object_property_add_child(qdev_get_machine(), "s390-ipl",
165 qdev_init_nofail(dev);
168 void s390_init_cpus(const char *cpu_model)
172 if (cpu_model == NULL) {
176 ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
178 for (i = 0; i < smp_cpus; i++) {
182 cpu = cpu_s390x_init(cpu_model);
187 cs->exception_index = EXCP_HLT;
192 void s390_create_virtio_net(BusState *bus, const char *name)
196 for (i = 0; i < nb_nics; i++) {
197 NICInfo *nd = &nd_table[i];
201 nd->model = g_strdup("virtio");
204 if (strcmp(nd->model, "virtio")) {
205 fprintf(stderr, "S390 only supports VirtIO nics\n");
209 dev = qdev_create(bus, name);
210 qdev_set_nic_properties(dev, nd);
211 qdev_init_nofail(dev);
215 void gtod_save(QEMUFile *f, void *opaque)
221 r = s390_get_clock(&tod_high, &tod_low);
223 fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
224 "Error code %d. Guest clock will not be migrated "
225 "which could cause the guest to hang.\n", r);
226 qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
230 qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
231 qemu_put_byte(f, tod_high);
232 qemu_put_be64(f, tod_low);
235 int gtod_load(QEMUFile *f, void *opaque, int version_id)
241 if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
242 fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
243 "cause the guest to hang.\n");
247 tod_high = qemu_get_byte(f);
248 tod_low = qemu_get_be64(f);
250 r = s390_set_clock(&tod_high, &tod_low);
252 fprintf(stderr, "WARNING: Unable to set guest clock value. "
253 "s390_get_clock returned error %d. This could cause "
254 "the guest to hang.\n", r);
260 /* PC hardware initialisation */
261 static void s390_init(MachineState *machine)
263 ram_addr_t my_ram_size = machine->ram_size;
264 MemoryRegion *sysmem = get_system_memory();
265 MemoryRegion *ram = g_new(MemoryRegion, 1);
266 int increment_size = 20;
268 hwaddr virtio_region_len;
269 hwaddr virtio_region_start;
272 * The storage increment size is a multiple of 1M and is a power of 2.
273 * The number of storage increments must be MAX_STORAGE_INCREMENTS or
276 while ((my_ram_size >> increment_size) > MAX_STORAGE_INCREMENTS) {
279 my_ram_size = my_ram_size >> increment_size << increment_size;
281 /* let's propagate the changed ram size into the global variable. */
282 ram_size = my_ram_size;
285 s390_bus = s390_virtio_bus_init(&my_ram_size);
287 s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
288 machine->initrd_filename, ZIPL_FILENAME, false);
291 /* register hypercalls */
292 s390_virtio_register_hcalls();
295 memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
296 vmstate_register_ram_global(ram);
297 memory_region_add_subregion(sysmem, 0, ram);
299 /* clear virtio region */
300 virtio_region_len = my_ram_size - ram_size;
301 virtio_region_start = ram_size;
302 virtio_region = cpu_physical_memory_map(virtio_region_start,
303 &virtio_region_len, true);
304 memset(virtio_region, 0, virtio_region_len);
305 cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
308 /* Initialize storage key device */
312 s390_init_cpus(machine->cpu_model);
314 /* Create VirtIO network adapters */
315 s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
317 /* Register savevm handler for guest TOD clock */
318 register_savevm(NULL, "todclock", 0, 1, gtod_save, gtod_load, NULL);
321 void s390_nmi(NMIState *n, int cpu_index, Error **errp)
323 CPUState *cs = qemu_get_cpu(cpu_index);
325 if (s390_cpu_restart(S390_CPU(cs))) {
326 error_setg(errp, QERR_UNSUPPORTED);
330 static void s390_machine_class_init(ObjectClass *oc, void *data)
332 MachineClass *mc = MACHINE_CLASS(oc);
333 NMIClass *nc = NMI_CLASS(oc);
335 mc->name = "s390-virtio";
337 mc->desc = "VirtIO based S390 machine";
338 mc->init = s390_init;
339 mc->block_default_type = IF_VIRTIO;
347 nc->nmi_monitor_handler = s390_nmi;
350 static const TypeInfo s390_machine_info = {
351 .name = TYPE_S390_MACHINE,
352 .parent = TYPE_MACHINE,
353 .class_init = s390_machine_class_init,
354 .interfaces = (InterfaceInfo[]) {
360 static void s390_machine_register_types(void)
362 type_register_static(&s390_machine_info);
365 type_init(s390_machine_register_types)