hw/s390x/s390-virtio-ccw.c

   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 "ioinst.h"
  17 #include "css.h"
  18 #include "virtio-ccw.h"
  19
  20 static int virtio_ccw_hcall_notify(const uint64_t *args)
  21 {
  22     uint64_t subch_id = args[0];
  23     uint64_t queue = args[1];
  24     SubchDev *sch;
  25     int cssid, ssid, schid, m;
  26
  27     if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {
  28         return -EINVAL;
  29     }
  30     sch = css_find_subch(m, cssid, ssid, schid);
  31     if (!sch || !css_subch_visible(sch)) {
  32         return -EINVAL;
  33     }
  34     if (queue >= VIRTIO_PCI_QUEUE_MAX) {
  35         return -EINVAL;
  36     }
  37     virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
  38     return 0;
  39
  40 }
  41
  42 static int virtio_ccw_hcall_early_printk(const uint64_t *args)
  43 {
  44     uint64_t mem = args[0];
  45
  46     if (mem < ram_size) {
  47         /* Early printk */
  48         return 0;
  49     }
  50     return -EINVAL;
  51 }
  52
  53 static void virtio_ccw_register_hcalls(void)
  54 {
  55     s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY,
  56                                    virtio_ccw_hcall_notify);
  57     /* Tolerate early printk. */
  58     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
  59                                    virtio_ccw_hcall_early_printk);
  60 }
  61
  62 static void ccw_init(QEMUMachineInitArgs *args)
  63 {
  64     ram_addr_t my_ram_size = args->ram_size;
  65     MemoryRegion *sysmem = get_system_memory();
  66     MemoryRegion *ram = g_new(MemoryRegion, 1);
  67     int shift = 0;
  68     uint8_t *storage_keys;
  69     int ret;
  70     VirtualCssBus *css_bus;
  71
  72     /* s390x ram size detection needs a 16bit multiplier + an increment. So
  73        guests > 64GB can be specified in 2MB steps etc. */
  74     while ((my_ram_size >> (20 + shift)) > 65535) {
  75         shift++;
  76     }
  77     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
  78
  79     /* let's propagate the changed ram size into the global variable. */
  80     ram_size = my_ram_size;
  81
  82     /* get a BUS */
  83     css_bus = virtual_css_bus_init();
  84     s390_sclp_init();
  85     s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline,
  86                       args->initrd_filename, "s390-ccw.img");
  87
  88     /* register hypercalls */
  89     virtio_ccw_register_hcalls();
  90
  91     /* allocate RAM */
  92     memory_region_init_ram(ram, "s390.ram", my_ram_size);
  93     vmstate_register_ram_global(ram);
  94     memory_region_add_subregion(sysmem, 0, ram);
  95
  96     /* allocate storage keys */
  97     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
  98
  99     /* init CPUs */
 100     s390_init_cpus(args->cpu_model, storage_keys);
 101
 102     if (kvm_enabled()) {
 103         kvm_s390_enable_css_support(s390_cpu_addr2state(0));
 104     }
 105     /*
 106      * Create virtual css and set it as default so that non mcss-e
 107      * enabled guests only see virtio devices.
 108      */
 109     ret = css_create_css_image(VIRTUAL_CSSID, true);
 110     assert(ret == 0);
 111
 112     /* Create VirtIO network adapters */
 113     s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw");
 114 }
 115
 116 static QEMUMachine ccw_machine = {
 117     .name = "s390-ccw-virtio",
 118     .alias = "s390-ccw",
 119     .desc = "VirtIO-ccw based S390 machine",
 120     .init = ccw_init,
 121     .block_default_type = IF_VIRTIO,
 122     .no_cdrom = 1,
 123     .no_floppy = 1,
 124     .no_serial = 1,
 125     .no_parallel = 1,
 126     .no_sdcard = 1,
 127     .use_sclp = 1,
 128     .max_cpus = 255,
 129     DEFAULT_MACHINE_OPTIONS,
 130 };
 131
 132 static void ccw_machine_init(void)
 133 {
 134     qemu_register_machine(&ccw_machine);
 135 }
 136
 137 machine_init(ccw_machine_init)