1 /* 2 * virtio ccw machine 3 * 4 * Copyright 2012 IBM Corp. 5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or (at 8 * your option) any later version. See the COPYING file in the top-level 9 * directory. 10 */ 11 12 #include "hw/boards.h" 13 #include "exec/address-spaces.h" 14 #include "s390-virtio.h" 15 #include "hw/s390x/sclp.h" 16 #include "hw/s390x/s390_flic.h" 17 #include "ioinst.h" 18 #include "css.h" 19 #include "virtio-ccw.h" 20 #include "qemu/config-file.h" 21 #include "s390-pci-bus.h" 22 23 #define TYPE_S390_CCW_MACHINE "s390-ccw-machine" 24 25 void io_subsystem_reset(void) 26 { 27 DeviceState *css, *sclp, *flic; 28 29 css = DEVICE(object_resolve_path_type("", "virtual-css-bridge", NULL)); 30 if (css) { 31 qdev_reset_all(css); 32 } 33 sclp = DEVICE(object_resolve_path_type("", 34 "s390-sclp-event-facility", NULL)); 35 if (sclp) { 36 qdev_reset_all(sclp); 37 } 38 flic = DEVICE(object_resolve_path_type("", "s390-flic", NULL)); 39 if (flic) { 40 qdev_reset_all(flic); 41 } 42 } 43 44 static int virtio_ccw_hcall_notify(const uint64_t *args) 45 { 46 uint64_t subch_id = args[0]; 47 uint64_t queue = args[1]; 48 SubchDev *sch; 49 int cssid, ssid, schid, m; 50 51 if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) { 52 return -EINVAL; 53 } 54 sch = css_find_subch(m, cssid, ssid, schid); 55 if (!sch || !css_subch_visible(sch)) { 56 return -EINVAL; 57 } 58 if (queue >= VIRTIO_PCI_QUEUE_MAX) { 59 return -EINVAL; 60 } 61 virtio_queue_notify(virtio_ccw_get_vdev(sch), queue); 62 return 0; 63 64 } 65 66 static int virtio_ccw_hcall_early_printk(const uint64_t *args) 67 { 68 uint64_t mem = args[0]; 69 70 if (mem < ram_size) { 71 /* Early printk */ 72 return 0; 73 } 74 return -EINVAL; 75 } 76 77 static void virtio_ccw_register_hcalls(void) 78 { 79 s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, 80 virtio_ccw_hcall_notify); 81 /* Tolerate early printk. */ 82 s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY, 83 virtio_ccw_hcall_early_printk); 84 } 85 86 static void ccw_init(MachineState *machine) 87 { 88 ram_addr_t my_ram_size = machine->ram_size; 89 MemoryRegion *sysmem = get_system_memory(); 90 MemoryRegion *ram = g_new(MemoryRegion, 1); 91 sclpMemoryHotplugDev *mhd = init_sclp_memory_hotplug_dev(); 92 uint8_t *storage_keys; 93 int ret; 94 VirtualCssBus *css_bus; 95 DeviceState *dev; 96 QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL); 97 ram_addr_t pad_size = 0; 98 ram_addr_t maxmem = qemu_opt_get_size(opts, "maxmem", my_ram_size); 99 ram_addr_t standby_mem_size = maxmem - my_ram_size; 100 101 /* The storage increment size is a multiple of 1M and is a power of 2. 102 * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer. 103 * The variable 'mhd->increment_size' is an exponent of 2 that can be 104 * used to calculate the size (in bytes) of an increment. */ 105 mhd->increment_size = 20; 106 while ((my_ram_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) { 107 mhd->increment_size++; 108 } 109 while ((standby_mem_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) { 110 mhd->increment_size++; 111 } 112 113 /* The core and standby memory areas need to be aligned with 114 * the increment size. In effect, this can cause the 115 * user-specified memory size to be rounded down to align 116 * with the nearest increment boundary. */ 117 standby_mem_size = standby_mem_size >> mhd->increment_size 118 << mhd->increment_size; 119 my_ram_size = my_ram_size >> mhd->increment_size 120 << mhd->increment_size; 121 122 /* let's propagate the changed ram size into the global variable. */ 123 ram_size = my_ram_size; 124 125 /* get a BUS */ 126 css_bus = virtual_css_bus_init(); 127 s390_sclp_init(); 128 s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline, 129 machine->initrd_filename, "s390-ccw.img"); 130 s390_flic_init(); 131 132 dev = qdev_create(NULL, TYPE_S390_PCI_HOST_BRIDGE); 133 object_property_add_child(qdev_get_machine(), TYPE_S390_PCI_HOST_BRIDGE, 134 OBJECT(dev), NULL); 135 qdev_init_nofail(dev); 136 137 /* register hypercalls */ 138 virtio_ccw_register_hcalls(); 139 140 /* allocate RAM for core */ 141 memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort); 142 vmstate_register_ram_global(ram); 143 memory_region_add_subregion(sysmem, 0, ram); 144 145 /* If the size of ram is not on a MEM_SECTION_SIZE boundary, 146 calculate the pad size necessary to force this boundary. */ 147 if (standby_mem_size) { 148 if (my_ram_size % MEM_SECTION_SIZE) { 149 pad_size = MEM_SECTION_SIZE - my_ram_size % MEM_SECTION_SIZE; 150 } 151 my_ram_size += standby_mem_size + pad_size; 152 mhd->pad_size = pad_size; 153 mhd->standby_mem_size = standby_mem_size; 154 } 155 156 /* allocate storage keys */ 157 storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE); 158 159 /* init CPUs */ 160 s390_init_cpus(machine->cpu_model, storage_keys); 161 162 if (kvm_enabled()) { 163 kvm_s390_enable_css_support(s390_cpu_addr2state(0)); 164 } 165 /* 166 * Create virtual css and set it as default so that non mcss-e 167 * enabled guests only see virtio devices. 168 */ 169 ret = css_create_css_image(VIRTUAL_CSSID, true); 170 assert(ret == 0); 171 172 /* Create VirtIO network adapters */ 173 s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw"); 174 } 175 176 static void ccw_machine_class_init(ObjectClass *oc, void *data) 177 { 178 MachineClass *mc = MACHINE_CLASS(oc); 179 NMIClass *nc = NMI_CLASS(oc); 180 181 mc->name = "s390-ccw-virtio"; 182 mc->alias = "s390-ccw"; 183 mc->desc = "VirtIO-ccw based S390 machine"; 184 mc->init = ccw_init; 185 mc->block_default_type = IF_VIRTIO; 186 mc->no_cdrom = 1; 187 mc->no_floppy = 1; 188 mc->no_serial = 1; 189 mc->no_parallel = 1; 190 mc->no_sdcard = 1; 191 mc->use_sclp = 1; 192 mc->max_cpus = 255; 193 nc->nmi_monitor_handler = s390_nmi; 194 } 195 196 static const TypeInfo ccw_machine_info = { 197 .name = TYPE_S390_CCW_MACHINE, 198 .parent = TYPE_MACHINE, 199 .class_init = ccw_machine_class_init, 200 .interfaces = (InterfaceInfo[]) { 201 { TYPE_NMI }, 202 { } 203 }, 204 }; 205 206 static void ccw_machine_register_types(void) 207 { 208 type_register_static(&ccw_machine_info); 209 } 210 211 type_init(ccw_machine_register_types) 212