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a5c95808 CH |
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 "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 | virtio_queue_notify(virtio_ccw_get_vdev(sch), queue); | |
35 | return 0; | |
36 | ||
37 | } | |
38 | ||
39 | static int virtio_ccw_hcall_early_printk(const uint64_t *args) | |
40 | { | |
41 | uint64_t mem = args[0]; | |
42 | ||
43 | if (mem < ram_size) { | |
44 | /* Early printk */ | |
45 | return 0; | |
46 | } | |
47 | return -EINVAL; | |
48 | } | |
49 | ||
50 | static void virtio_ccw_register_hcalls(void) | |
51 | { | |
52 | s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, | |
53 | virtio_ccw_hcall_notify); | |
54 | /* Tolerate early printk. */ | |
55 | s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY, | |
56 | virtio_ccw_hcall_early_printk); | |
57 | } | |
58 | ||
59 | static void ccw_init(QEMUMachineInitArgs *args) | |
60 | { | |
61 | ram_addr_t my_ram_size = args->ram_size; | |
62 | MemoryRegion *sysmem = get_system_memory(); | |
63 | MemoryRegion *ram = g_new(MemoryRegion, 1); | |
64 | int shift = 0; | |
65 | uint8_t *storage_keys; | |
66 | int ret; | |
67 | VirtualCssBus *css_bus; | |
68 | ||
69 | /* s390x ram size detection needs a 16bit multiplier + an increment. So | |
70 | guests > 64GB can be specified in 2MB steps etc. */ | |
71 | while ((my_ram_size >> (20 + shift)) > 65535) { | |
72 | shift++; | |
73 | } | |
74 | my_ram_size = my_ram_size >> (20 + shift) << (20 + shift); | |
75 | ||
76 | /* lets propagate the changed ram size into the global variable. */ | |
77 | ram_size = my_ram_size; | |
78 | ||
79 | /* get a BUS */ | |
80 | css_bus = virtual_css_bus_init(); | |
81 | s390_sclp_init(); | |
82 | s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline, | |
83 | args->initrd_filename); | |
84 | ||
85 | /* register hypercalls */ | |
86 | virtio_ccw_register_hcalls(); | |
87 | ||
88 | /* allocate RAM */ | |
89 | memory_region_init_ram(ram, "s390.ram", my_ram_size); | |
90 | vmstate_register_ram_global(ram); | |
91 | memory_region_add_subregion(sysmem, 0, ram); | |
92 | ||
93 | /* allocate storage keys */ | |
94 | storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE); | |
95 | ||
96 | /* init CPUs */ | |
97 | s390_init_cpus(args->cpu_model, storage_keys); | |
98 | ||
99 | if (kvm_enabled()) { | |
100 | kvm_s390_enable_css_support(s390_cpu_addr2state(0)); | |
101 | } | |
102 | /* | |
103 | * Create virtual css and set it as default so that non mcss-e | |
104 | * enabled guests only see virtio devices. | |
105 | */ | |
106 | ret = css_create_css_image(VIRTUAL_CSSID, true); | |
107 | assert(ret == 0); | |
108 | ||
109 | /* Create VirtIO network adapters */ | |
110 | s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw"); | |
111 | } | |
112 | ||
113 | static QEMUMachine ccw_machine = { | |
114 | .name = "s390-ccw-virtio", | |
115 | .alias = "s390-ccw", | |
116 | .desc = "VirtIO-ccw based S390 machine", | |
117 | .init = ccw_init, | |
118 | .block_default_type = IF_VIRTIO, | |
119 | .no_cdrom = 1, | |
120 | .no_floppy = 1, | |
121 | .no_serial = 1, | |
122 | .no_parallel = 1, | |
123 | .no_sdcard = 1, | |
124 | .use_sclp = 1, | |
125 | .max_cpus = 255, | |
126 | DEFAULT_MACHINE_OPTIONS, | |
127 | }; | |
128 | ||
129 | static void ccw_machine_init(void) | |
130 | { | |
131 | qemu_register_machine(&ccw_machine); | |
132 | } | |
133 | ||
134 | machine_init(ccw_machine_init) |