Add S390x virtio machine description

In order to use the new S390x virtio bus we just introduced, we also
need a machine description that sets up the machine according to our
PV specification.

Let's add that machine description and be happy!

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

Makefile.target

@@ -293,7 +293,7 @@ obj-sh4-y += ide/core.o ide/mmio.o
 obj-m68k-y = an5206.o mcf5206.o mcf_uart.o mcf_intc.o mcf5208.o mcf_fec.o
 obj-m68k-y += m68k-semi.o dummy_m68k.o
 
-obj-s390x-y = s390-virtio-bus.o
+obj-s390x-y = s390-virtio-bus.o s390-virtio.o
 
 main.o vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)
 

hw/s390-virtio.c

@@ -0,0 +1,255 @@
+/*
+ * QEMU S390 virtio target
+ *
+ * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hw.h"
+#include "block.h"
+#include "sysemu.h"
+#include "net.h"
+#include "boards.h"
+#include "monitor.h"
+#include "loader.h"
+#include "elf.h"
+#include "hw/virtio.h"
+#include "hw/virtio-console.h"
+#include "hw/sysbus.h"
+#include "kvm.h"
+
+#include "hw/s390-virtio-bus.h"
+
+//#define DEBUG_S390
+
+#ifdef DEBUG_S390
+#define dprintf(fmt, ...) \
+    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
+#else
+#define dprintf(fmt, ...) \
+    do { } while (0)
+#endif
+
+#define KVM_S390_VIRTIO_NOTIFY          0
+#define KVM_S390_VIRTIO_RESET           1
+#define KVM_S390_VIRTIO_SET_STATUS      2
+
+#define KERN_IMAGE_START                0x010000UL
+#define KERN_PARM_AREA                  0x010480UL
+#define INITRD_START                    0x800000UL
+#define INITRD_PARM_START               0x010408UL
+#define INITRD_PARM_SIZE                0x010410UL
+#define PARMFILE_START                  0x001000UL
+
+#define MAX_BLK_DEVS                    10
+
+static VirtIOS390Bus *s390_bus;
+static CPUState **ipi_states;
+
+void irq_info(Monitor *mon);
+void pic_info(Monitor *mon);
+
+void irq_info(Monitor *mon)
+{
+}
+
+void pic_info(Monitor *mon)
+{
+}
+
+CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
+{
+    if (cpu_addr >= smp_cpus) {
+        return NULL;
+    }
+
+    return ipi_states[cpu_addr];
+}
+
+int s390_virtio_hypercall(CPUState *env)
+{
+    int r = 0, i;
+    target_ulong mem = env->regs[2];
+
+    dprintf("KVM hypercall: %ld\n", env->regs[1]);
+    switch (env->regs[1]) {
+    case KVM_S390_VIRTIO_NOTIFY:
+        if (mem > ram_size) {
+            VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
+                                                               mem, &i);
+            if (dev) {
+                virtio_queue_notify(dev->vdev, i);
+            } else {
+                r = -EINVAL;
+            }
+        } else {
+            /* Early printk */
+        }
+        break;
+    case KVM_S390_VIRTIO_RESET:
+    {
+        /* Virtio_reset resets the internal addresses, so we'd have to sync
+           them up again. We don't want to reallocate a vring though, so let's
+           just not reset. */
+        /* virtio_reset(dev->vdev); */
+        break;
+    }
+    case KVM_S390_VIRTIO_SET_STATUS:
+    {
+        VirtIOS390Device *dev;
+
+        dev = s390_virtio_bus_find_mem(s390_bus, mem);
+        if (dev) {
+            s390_virtio_device_update_status(dev);
+        } else {
+            r = -EINVAL;
+        }
+        break;
+    }
+    default:
+        r = -EINVAL;
+        break;
+    }
+
+    env->regs[2] = r;
+    return 0;
+}
+
+/* PC hardware initialisation */
+static void s390_init(ram_addr_t ram_size,
+                      const char *boot_device,
+                      const char *kernel_filename,
+                      const char *kernel_cmdline,
+                      const char *initrd_filename,
+                      const char *cpu_model)
+{
+    CPUState *env = NULL;
+    ram_addr_t ram_addr;
+    ram_addr_t kernel_size = 0;
+    ram_addr_t initrd_offset;
+    ram_addr_t initrd_size = 0;
+    int i;
+
+    /* get a BUS */
+    s390_bus = s390_virtio_bus_init(&ram_size);
+
+    /* allocate RAM */
+    ram_addr = qemu_ram_alloc(ram_size);
+    cpu_register_physical_memory(0, ram_size, ram_addr);
+
+    /* init CPUs */
+    if (cpu_model == NULL) {
+        cpu_model = "host";
+    }
+
+    ipi_states = qemu_malloc(sizeof(CPUState *) * smp_cpus);
+
+    for (i = 0; i < smp_cpus; i++) {
+        CPUState *tmp_env;
+
+        tmp_env = cpu_init(cpu_model);
+        if (!env) {
+            env = tmp_env;
+        }
+        ipi_states[i] = tmp_env;
+        tmp_env->halted = 1;
+        tmp_env->exception_index = EXCP_HLT;
+    }
+
+    env->halted = 0;
+    env->exception_index = 0;
+
+    if (kernel_filename) {
+        kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
+
+        if (lduw_phys(KERN_IMAGE_START) != 0x0dd0) {
+            fprintf(stderr, "Specified image is not an s390 boot image\n");
+            exit(1);
+        }
+
+        cpu_synchronize_state(env);
+        env->psw.addr = KERN_IMAGE_START;
+        env->psw.mask = 0x0000000180000000UL;
+    }
+
+    if (initrd_filename) {
+        initrd_offset = INITRD_START;
+        while (kernel_size + 0x100000 > initrd_offset) {
+            initrd_offset += 0x100000;
+        }
+        initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
+
+        stq_phys(INITRD_PARM_START, initrd_offset);
+        stq_phys(INITRD_PARM_SIZE, initrd_size);
+    }
+
+    if (kernel_cmdline) {
+        cpu_physical_memory_rw(KERN_PARM_AREA, (uint8_t *)kernel_cmdline,
+                               strlen(kernel_cmdline), 1);
+    }
+
+    /* Create VirtIO console */
+    qdev_init_nofail(qdev_create((BusState *)s390_bus, "virtio-console-s390"));
+
+    /* Create VirtIO network adapters */
+    for(i = 0; i < nb_nics; i++) {
+        NICInfo *nd = &nd_table[i];
+        DeviceState *dev;
+
+        if (!nd->model) {
+            nd->model = (char*)"virtio";
+        }
+
+        if (strcmp(nd->model, "virtio")) {
+            fprintf(stderr, "S390 only supports VirtIO nics\n");
+            exit(1);
+        }
+
+        dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
+        qdev_set_nic_properties(dev, nd);
+        qdev_init_nofail(dev);
+    }
+
+    /* Create VirtIO disk drives */
+    for(i = 0; i < MAX_BLK_DEVS; i++) {
+        DriveInfo *dinfo;
+        DeviceState *dev;
+
+        dinfo = drive_get(IF_IDE, 0, i);
+        if (!dinfo) {
+            continue;
+        }
+
+        dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
+        qdev_prop_set_drive(dev, "drive", dinfo);
+        qdev_init_nofail(dev);
+    }
+}
+
+static QEMUMachine s390_machine = {
+    .name = "s390-virtio",
+    .alias = "s390",
+    .desc = "VirtIO based S390 machine",
+    .init = s390_init,
+    .max_cpus = 255,
+    .is_default = 1,
+};
+
+static void s390_machine_init(void)
+{
+    qemu_register_machine(&s390_machine);
+}
+
+machine_init(s390_machine_init);