e03ba13637
Minor fixes to documentation and code comments. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
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* virtio ccw machine
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*
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* Copyright 2012 IBM Corp.
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* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "hw/boards.h"
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#include "exec/address-spaces.h"
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#include "s390-virtio.h"
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#include "hw/s390x/sclp.h"
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#include "ioinst.h"
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#include "css.h"
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#include "virtio-ccw.h"
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static int virtio_ccw_hcall_notify(const uint64_t *args)
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{
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uint64_t subch_id = args[0];
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uint64_t queue = args[1];
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SubchDev *sch;
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int cssid, ssid, schid, m;
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if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {
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return -EINVAL;
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}
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sch = css_find_subch(m, cssid, ssid, schid);
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if (!sch || !css_subch_visible(sch)) {
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return -EINVAL;
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}
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if (queue >= VIRTIO_PCI_QUEUE_MAX) {
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return -EINVAL;
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}
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virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
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return 0;
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}
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static int virtio_ccw_hcall_early_printk(const uint64_t *args)
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{
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uint64_t mem = args[0];
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if (mem < ram_size) {
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/* Early printk */
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return 0;
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}
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return -EINVAL;
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}
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static void virtio_ccw_register_hcalls(void)
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{
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s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY,
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virtio_ccw_hcall_notify);
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/* Tolerate early printk. */
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s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
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virtio_ccw_hcall_early_printk);
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}
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static void ccw_init(QEMUMachineInitArgs *args)
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{
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ram_addr_t my_ram_size = args->ram_size;
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MemoryRegion *sysmem = get_system_memory();
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MemoryRegion *ram = g_new(MemoryRegion, 1);
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int shift = 0;
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uint8_t *storage_keys;
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int ret;
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VirtualCssBus *css_bus;
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/* s390x ram size detection needs a 16bit multiplier + an increment. So
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guests > 64GB can be specified in 2MB steps etc. */
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while ((my_ram_size >> (20 + shift)) > 65535) {
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shift++;
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}
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my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
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/* let's propagate the changed ram size into the global variable. */
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ram_size = my_ram_size;
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/* get a BUS */
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css_bus = virtual_css_bus_init();
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s390_sclp_init();
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s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline,
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args->initrd_filename);
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/* register hypercalls */
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virtio_ccw_register_hcalls();
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/* allocate RAM */
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memory_region_init_ram(ram, "s390.ram", my_ram_size);
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vmstate_register_ram_global(ram);
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memory_region_add_subregion(sysmem, 0, ram);
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/* allocate storage keys */
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storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
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/* init CPUs */
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s390_init_cpus(args->cpu_model, storage_keys);
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if (kvm_enabled()) {
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kvm_s390_enable_css_support(s390_cpu_addr2state(0));
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}
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/*
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* Create virtual css and set it as default so that non mcss-e
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* enabled guests only see virtio devices.
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*/
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ret = css_create_css_image(VIRTUAL_CSSID, true);
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assert(ret == 0);
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/* Create VirtIO network adapters */
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s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw");
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}
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static QEMUMachine ccw_machine = {
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.name = "s390-ccw-virtio",
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.alias = "s390-ccw",
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.desc = "VirtIO-ccw based S390 machine",
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.init = ccw_init,
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.block_default_type = IF_VIRTIO,
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.no_cdrom = 1,
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.no_floppy = 1,
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.no_serial = 1,
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.no_parallel = 1,
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.no_sdcard = 1,
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.use_sclp = 1,
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.max_cpus = 255,
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DEFAULT_MACHINE_OPTIONS,
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};
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static void ccw_machine_init(void)
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{
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qemu_register_machine(&ccw_machine);
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}
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machine_init(ccw_machine_init)
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