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