The guest may issue a RESET command for virtio. So far we didn't bother to implement it, but with my new bootloader we actually need it for Linux to get back to a safe state. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
263 lines
6.5 KiB
C
263 lines
6.5 KiB
C
/*
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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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*
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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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* 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.h"
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#include "block.h"
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#include "sysemu.h"
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#include "net.h"
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#include "boards.h"
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#include "monitor.h"
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#include "loader.h"
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#include "elf.h"
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#include "hw/virtio.h"
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#include "hw/sysbus.h"
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#include "kvm.h"
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#include "hw/s390-virtio-bus.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 KVM_S390_VIRTIO_NOTIFY 0
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#define KVM_S390_VIRTIO_RESET 1
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#define KVM_S390_VIRTIO_SET_STATUS 2
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#define KERN_IMAGE_START 0x010000UL
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#define KERN_PARM_AREA 0x010480UL
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#define INITRD_START 0x800000UL
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#define INITRD_PARM_START 0x010408UL
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#define INITRD_PARM_SIZE 0x010410UL
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#define PARMFILE_START 0x001000UL
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#define MAX_BLK_DEVS 10
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static VirtIOS390Bus *s390_bus;
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static CPUState **ipi_states;
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void irq_info(Monitor *mon);
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void pic_info(Monitor *mon);
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void irq_info(Monitor *mon)
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{
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}
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void pic_info(Monitor *mon)
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{
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}
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CPUState *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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int s390_virtio_hypercall(CPUState *env)
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{
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int r = 0, i;
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target_ulong mem = env->regs[2];
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dprintf("KVM hypercall: %ld\n", env->regs[1]);
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switch (env->regs[1]) {
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case KVM_S390_VIRTIO_NOTIFY:
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if (mem > ram_size) {
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VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
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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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break;
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case KVM_S390_VIRTIO_RESET:
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{
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VirtIOS390Device *dev;
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dev = s390_virtio_bus_find_mem(s390_bus, mem);
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virtio_reset(dev->vdev);
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s390_virtio_device_sync(dev);
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break;
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}
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case KVM_S390_VIRTIO_SET_STATUS:
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{
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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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break;
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}
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default:
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r = -EINVAL;
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break;
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}
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env->regs[2] = r;
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return 0;
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}
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/* PC hardware initialisation */
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static void s390_init(ram_addr_t ram_size,
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const char *boot_device,
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const char *kernel_filename,
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const char *kernel_cmdline,
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const char *initrd_filename,
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const char *cpu_model)
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{
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CPUState *env = NULL;
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ram_addr_t ram_addr;
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ram_addr_t kernel_size = 0;
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ram_addr_t initrd_offset;
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ram_addr_t initrd_size = 0;
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int i;
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/* XXX we only work on KVM for now */
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if (!kvm_enabled()) {
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fprintf(stderr, "The S390 target only works with KVM enabled\n");
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exit(1);
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}
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/* get a BUS */
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s390_bus = s390_virtio_bus_init(&ram_size);
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/* allocate RAM */
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ram_addr = qemu_ram_alloc(ram_size);
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cpu_register_physical_memory(0, ram_size, ram_addr);
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/* init CPUs */
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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 = qemu_malloc(sizeof(CPUState *) * smp_cpus);
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for (i = 0; i < smp_cpus; i++) {
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CPUState *tmp_env;
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tmp_env = cpu_init(cpu_model);
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if (!env) {
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env = tmp_env;
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}
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ipi_states[i] = tmp_env;
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tmp_env->halted = 1;
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tmp_env->exception_index = EXCP_HLT;
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}
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env->halted = 0;
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env->exception_index = 0;
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if (kernel_filename) {
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kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
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if (lduw_phys(KERN_IMAGE_START) != 0x0dd0) {
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fprintf(stderr, "Specified image is not an s390 boot image\n");
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exit(1);
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}
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env->psw.addr = KERN_IMAGE_START;
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env->psw.mask = 0x0000000180000000ULL;
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}
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if (initrd_filename) {
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initrd_offset = INITRD_START;
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while (kernel_size + 0x100000 > initrd_offset) {
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initrd_offset += 0x100000;
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}
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initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
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stq_phys(INITRD_PARM_START, initrd_offset);
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stq_phys(INITRD_PARM_SIZE, initrd_size);
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}
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if (kernel_cmdline) {
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cpu_physical_memory_rw(KERN_PARM_AREA, (uint8_t *)kernel_cmdline,
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strlen(kernel_cmdline), 1);
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}
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/* Create VirtIO network adapters */
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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 = qemu_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((BusState *)s390_bus, "virtio-net-s390");
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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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/* Create VirtIO disk drives */
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for(i = 0; i < MAX_BLK_DEVS; i++) {
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DriveInfo *dinfo;
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DeviceState *dev;
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dinfo = drive_get(IF_IDE, 0, i);
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if (!dinfo) {
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continue;
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}
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dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
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qdev_prop_set_drive(dev, "drive", dinfo);
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qdev_init_nofail(dev);
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}
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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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.no_serial = 1,
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.no_parallel = 1,
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.use_virtcon = 1,
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.no_vga = 1,
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.max_cpus = 255,
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.is_default = 1,
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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);
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