root / hw / s390x / s390-virtio.c @ 0d09e41a
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/*
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* QEMU S390 virtio target
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*
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* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
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* Copyright IBM Corp 2012
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* Contributions after 2012-10-29 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*
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* You should have received a copy of the GNU (Lesser) General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hw/hw.h" |
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#include "block/block.h" |
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#include "sysemu/blockdev.h" |
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#include "sysemu/sysemu.h" |
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#include "net/net.h" |
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#include "hw/boards.h" |
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#include "monitor/monitor.h" |
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#include "hw/loader.h" |
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#include "hw/virtio/virtio.h" |
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#include "hw/sysbus.h" |
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#include "sysemu/kvm.h" |
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#include "exec/address-spaces.h" |
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#include "hw/s390x/s390-virtio-bus.h" |
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#include "hw/s390x/sclp.h" |
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#include "hw/s390x/s390-virtio.h" |
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//#define DEBUG_S390
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#ifdef DEBUG_S390
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define dprintf(fmt, ...) \
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do { } while (0) |
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#endif
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#define MAX_BLK_DEVS 10 |
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static VirtIOS390Bus *s390_bus;
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static S390CPU **ipi_states;
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S390CPU *s390_cpu_addr2state(uint16_t cpu_addr) |
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{ |
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if (cpu_addr >= smp_cpus) {
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return NULL; |
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} |
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return ipi_states[cpu_addr];
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} |
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static int s390_virtio_hcall_notify(const uint64_t *args) |
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{ |
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uint64_t mem = args[0];
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int r = 0, i; |
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if (mem > ram_size) {
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VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i); |
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if (dev) {
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virtio_queue_notify(dev->vdev, i); |
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} else {
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r = -EINVAL; |
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} |
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} else {
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/* Early printk */
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} |
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return r;
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} |
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static int s390_virtio_hcall_reset(const uint64_t *args) |
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{ |
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uint64_t mem = args[0];
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VirtIOS390Device *dev; |
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dev = s390_virtio_bus_find_mem(s390_bus, mem); |
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if (dev == NULL) { |
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return -EINVAL;
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} |
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virtio_reset(dev->vdev); |
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stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
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s390_virtio_device_sync(dev); |
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s390_virtio_reset_idx(dev); |
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return 0; |
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} |
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static int s390_virtio_hcall_set_status(const uint64_t *args) |
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{ |
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uint64_t mem = args[0];
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int r = 0; |
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VirtIOS390Device *dev; |
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dev = s390_virtio_bus_find_mem(s390_bus, mem); |
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if (dev) {
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s390_virtio_device_update_status(dev); |
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} else {
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r = -EINVAL; |
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} |
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return r;
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} |
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static void s390_virtio_register_hcalls(void) |
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{ |
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s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY, |
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s390_virtio_hcall_notify); |
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s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET, |
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s390_virtio_hcall_reset); |
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s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS, |
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s390_virtio_hcall_set_status); |
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} |
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/*
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* The number of running CPUs. On s390 a shutdown is the state of all CPUs
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* being either stopped or disabled (for interrupts) waiting. We have to
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* track this number to call the shutdown sequence accordingly. This
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* number is modified either on startup or while holding the big qemu lock.
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*/
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static unsigned s390_running_cpus; |
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void s390_add_running_cpu(S390CPU *cpu)
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{ |
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CPUState *cs = CPU(cpu); |
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CPUS390XState *env = &cpu->env; |
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if (cs->halted) {
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s390_running_cpus++; |
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cs->halted = 0;
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env->exception_index = -1;
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} |
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} |
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unsigned s390_del_running_cpu(S390CPU *cpu)
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{ |
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CPUState *cs = CPU(cpu); |
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CPUS390XState *env = &cpu->env; |
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if (cs->halted == 0) { |
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assert(s390_running_cpus >= 1);
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s390_running_cpus--; |
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cs->halted = 1;
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env->exception_index = EXCP_HLT; |
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} |
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return s390_running_cpus;
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} |
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void s390_init_ipl_dev(const char *kernel_filename, |
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const char *kernel_cmdline, |
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const char *initrd_filename) |
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{ |
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DeviceState *dev; |
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dev = qdev_create(NULL, "s390-ipl"); |
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if (kernel_filename) {
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qdev_prop_set_string(dev, "kernel", kernel_filename);
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} |
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if (initrd_filename) {
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qdev_prop_set_string(dev, "initrd", initrd_filename);
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} |
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qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
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qdev_init_nofail(dev); |
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} |
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void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys) |
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{ |
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int i;
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if (cpu_model == NULL) { |
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cpu_model = "host";
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} |
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ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
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for (i = 0; i < smp_cpus; i++) { |
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S390CPU *cpu; |
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CPUState *cs; |
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cpu = cpu_s390x_init(cpu_model); |
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cs = CPU(cpu); |
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ipi_states[i] = cpu; |
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cs->halted = 1;
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cpu->env.exception_index = EXCP_HLT; |
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cpu->env.storage_keys = storage_keys; |
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} |
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} |
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void s390_create_virtio_net(BusState *bus, const char *name) |
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{ |
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int i;
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for (i = 0; i < nb_nics; i++) { |
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NICInfo *nd = &nd_table[i]; |
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DeviceState *dev; |
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if (!nd->model) {
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nd->model = g_strdup("virtio");
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} |
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if (strcmp(nd->model, "virtio")) { |
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fprintf(stderr, "S390 only supports VirtIO nics\n");
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exit(1);
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} |
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dev = qdev_create(bus, name); |
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qdev_set_nic_properties(dev, nd); |
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qdev_init_nofail(dev); |
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} |
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} |
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/* PC hardware initialisation */
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static void s390_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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void *virtio_region;
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hwaddr virtio_region_len; |
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hwaddr virtio_region_start; |
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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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/* lets 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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s390_bus = s390_virtio_bus_init(&my_ram_size); |
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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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s390_virtio_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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/* clear virtio region */
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virtio_region_len = my_ram_size - ram_size; |
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virtio_region_start = ram_size; |
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virtio_region = cpu_physical_memory_map(virtio_region_start, |
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&virtio_region_len, true);
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memset(virtio_region, 0, virtio_region_len);
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cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
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virtio_region_len); |
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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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/* Create VirtIO network adapters */
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s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
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} |
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static QEMUMachine s390_machine = {
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.name = "s390-virtio",
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.alias = "s390",
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.desc = "VirtIO based S390 machine",
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.init = s390_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_virtcon = 1,
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.max_cpus = 255,
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.is_default = 1,
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DEFAULT_MACHINE_OPTIONS, |
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}; |
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static void s390_machine_init(void) |
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{ |
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qemu_register_machine(&s390_machine); |
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} |
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machine_init(s390_machine_init); |