/* * virtio ccw machine * * Copyright 2012 IBM Corp. * Author(s): Cornelia Huck * * 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 "hw/s390x/s390_flic.h" #include "ioinst.h" #include "css.h" #include "virtio-ccw.h" #include "qemu/config-file.h" #include "s390-pci-bus.h" #define TYPE_S390_CCW_MACHINE "s390-ccw-machine" void io_subsystem_reset(void) { DeviceState *css, *sclp, *flic; 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); } flic = DEVICE(object_resolve_path_type("", "s390-flic", NULL)); if (flic) { qdev_reset_all(flic); } } 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(MachineState *machine) { ram_addr_t my_ram_size = machine->ram_size; MemoryRegion *sysmem = get_system_memory(); MemoryRegion *ram = g_new(MemoryRegion, 1); sclpMemoryHotplugDev *mhd = init_sclp_memory_hotplug_dev(); uint8_t *storage_keys; int ret; VirtualCssBus *css_bus; DeviceState *dev; QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL); ram_addr_t pad_size = 0; ram_addr_t maxmem = qemu_opt_get_size(opts, "maxmem", my_ram_size); ram_addr_t standby_mem_size = maxmem - my_ram_size; uint64_t kvm_limit; /* The storage increment size is a multiple of 1M and is a power of 2. * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer. * The variable 'mhd->increment_size' is an exponent of 2 that can be * used to calculate the size (in bytes) of an increment. */ mhd->increment_size = 20; while ((my_ram_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) { mhd->increment_size++; } while ((standby_mem_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) { mhd->increment_size++; } /* The core and standby memory areas need to be aligned with * the increment size. In effect, this can cause the * user-specified memory size to be rounded down to align * with the nearest increment boundary. */ standby_mem_size = standby_mem_size >> mhd->increment_size << mhd->increment_size; my_ram_size = my_ram_size >> mhd->increment_size << mhd->increment_size; /* let's propagate the changed ram size into the global variable. */ ram_size = my_ram_size; machine->maxram_size = my_ram_size + standby_mem_size; ret = s390_set_memory_limit(machine->maxram_size, &kvm_limit); if (ret == -E2BIG) { hw_error("qemu: host supports a maximum of %" PRIu64 " GB", kvm_limit >> 30); } else if (ret) { hw_error("qemu: setting the guest size failed"); } /* get a BUS */ css_bus = virtual_css_bus_init(); s390_sclp_init(); s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline, machine->initrd_filename, "s390-ccw.img", true); s390_flic_init(); dev = qdev_create(NULL, TYPE_S390_PCI_HOST_BRIDGE); object_property_add_child(qdev_get_machine(), TYPE_S390_PCI_HOST_BRIDGE, OBJECT(dev), NULL); qdev_init_nofail(dev); /* register hypercalls */ virtio_ccw_register_hcalls(); /* allocate RAM for core */ memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort); vmstate_register_ram_global(ram); memory_region_add_subregion(sysmem, 0, ram); /* If the size of ram is not on a MEM_SECTION_SIZE boundary, calculate the pad size necessary to force this boundary. */ if (standby_mem_size) { if (my_ram_size % MEM_SECTION_SIZE) { pad_size = MEM_SECTION_SIZE - my_ram_size % MEM_SECTION_SIZE; } my_ram_size += standby_mem_size + pad_size; mhd->pad_size = pad_size; mhd->standby_mem_size = standby_mem_size; } /* allocate storage keys */ storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE); /* init CPUs */ s390_init_cpus(machine->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 void ccw_machine_class_init(ObjectClass *oc, void *data) { MachineClass *mc = MACHINE_CLASS(oc); NMIClass *nc = NMI_CLASS(oc); mc->name = "s390-ccw-virtio"; mc->alias = "s390-ccw"; mc->desc = "VirtIO-ccw based S390 machine"; mc->init = ccw_init; mc->block_default_type = IF_VIRTIO; mc->no_cdrom = 1; mc->no_floppy = 1; mc->no_serial = 1; mc->no_parallel = 1; mc->no_sdcard = 1; mc->use_sclp = 1; mc->max_cpus = 255; nc->nmi_monitor_handler = s390_nmi; } static const TypeInfo ccw_machine_info = { .name = TYPE_S390_CCW_MACHINE, .parent = TYPE_MACHINE, .class_init = ccw_machine_class_init, .interfaces = (InterfaceInfo[]) { { TYPE_NMI }, { } }, }; static void ccw_machine_register_types(void) { type_register_static(&ccw_machine_info); } type_init(ccw_machine_register_types)