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 21 void io_subsystem_reset(void) 22 { 23 DeviceState *css, *sclp, *flic; 24 25 css = DEVICE(object_resolve_path_type("", "virtual-css-bridge", NULL)); 26 if (css) { 27 qdev_reset_all(css); 28 } 29 sclp = DEVICE(object_resolve_path_type("", 30 "s390-sclp-event-facility", NULL)); 31 if (sclp) { 32 qdev_reset_all(sclp); 33 } 34 flic = DEVICE(object_resolve_path_type("", "s390-flic", NULL)); 35 if (flic) { 36 qdev_reset_all(flic); 37 } 38 } 39 40 static int virtio_ccw_hcall_notify(const uint64_t *args) 41 { 42 uint64_t subch_id = args[0]; 43 uint64_t queue = args[1]; 44 SubchDev *sch; 45 int cssid, ssid, schid, m; 46 47 if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) { 48 return -EINVAL; 49 } 50 sch = css_find_subch(m, cssid, ssid, schid); 51 if (!sch || !css_subch_visible(sch)) { 52 return -EINVAL; 53 } 54 if (queue >= VIRTIO_PCI_QUEUE_MAX) { 55 return -EINVAL; 56 } 57 virtio_queue_notify(virtio_ccw_get_vdev(sch), queue); 58 return 0; 59 60 } 61 62 static int virtio_ccw_hcall_early_printk(const uint64_t *args) 63 { 64 uint64_t mem = args[0]; 65 66 if (mem < ram_size) { 67 /* Early printk */ 68 return 0; 69 } 70 return -EINVAL; 71 } 72 73 static void virtio_ccw_register_hcalls(void) 74 { 75 s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, 76 virtio_ccw_hcall_notify); 77 /* Tolerate early printk. */ 78 s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY, 79 virtio_ccw_hcall_early_printk); 80 } 81 82 static void ccw_init(MachineState *machine) 83 { 84 ram_addr_t my_ram_size = machine->ram_size; 85 MemoryRegion *sysmem = get_system_memory(); 86 MemoryRegion *ram = g_new(MemoryRegion, 1); 87 int shift = 0; 88 uint8_t *storage_keys; 89 int ret; 90 VirtualCssBus *css_bus; 91 92 /* s390x ram size detection needs a 16bit multiplier + an increment. So 93 guests > 64GB can be specified in 2MB steps etc. */ 94 while ((my_ram_size >> (20 + shift)) > 65535) { 95 shift++; 96 } 97 my_ram_size = my_ram_size >> (20 + shift) << (20 + shift); 98 99 /* let's propagate the changed ram size into the global variable. */ 100 ram_size = my_ram_size; 101 102 /* get a BUS */ 103 css_bus = virtual_css_bus_init(); 104 s390_sclp_init(); 105 s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline, 106 machine->initrd_filename, "s390-ccw.img"); 107 s390_flic_init(); 108 109 /* register hypercalls */ 110 virtio_ccw_register_hcalls(); 111 112 /* allocate RAM */ 113 memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size); 114 vmstate_register_ram_global(ram); 115 memory_region_add_subregion(sysmem, 0, ram); 116 117 /* allocate storage keys */ 118 storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE); 119 120 /* init CPUs */ 121 s390_init_cpus(machine->cpu_model, storage_keys); 122 123 if (kvm_enabled()) { 124 kvm_s390_enable_css_support(s390_cpu_addr2state(0)); 125 } 126 /* 127 * Create virtual css and set it as default so that non mcss-e 128 * enabled guests only see virtio devices. 129 */ 130 ret = css_create_css_image(VIRTUAL_CSSID, true); 131 assert(ret == 0); 132 133 /* Create VirtIO network adapters */ 134 s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw"); 135 } 136 137 static QEMUMachine ccw_machine = { 138 .name = "s390-ccw-virtio", 139 .alias = "s390-ccw", 140 .desc = "VirtIO-ccw based S390 machine", 141 .init = ccw_init, 142 .block_default_type = IF_VIRTIO, 143 .no_cdrom = 1, 144 .no_floppy = 1, 145 .no_serial = 1, 146 .no_parallel = 1, 147 .no_sdcard = 1, 148 .use_sclp = 1, 149 .max_cpus = 255, 150 }; 151 152 static void ccw_machine_init(void) 153 { 154 qemu_register_machine(&ccw_machine); 155 } 156 157 machine_init(ccw_machine_init) 158