Re: [Qemu-devel] [PATCH 3/5] s390: Add new channel I/O based virtio transport.

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On Tue, Aug 7, 2012 at 2:52 PM, Cornelia Huck <cornelia.huck@xxxxxxxxxx> wrote:
> Add a new virtio transport that uses channel commands to perform
> virtio operations.
>
> Add a new machine type s390-ccw that uses this virtio-ccw transport
> and make it the default machine for s390.
>
> Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
> ---
>  hw/qdev-monitor.c      |   5 +
>  hw/s390-virtio.c       | 268 ++++++++++----
>  hw/s390x/Makefile.objs |   1 +
>  hw/s390x/virtio-ccw.c  | 962 +++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/s390x/virtio-ccw.h  |  77 ++++
>  vl.c                   |   1 +
>  6 files changed, 1243 insertions(+), 71 deletions(-)
>  create mode 100644 hw/s390x/virtio-ccw.c
>  create mode 100644 hw/s390x/virtio-ccw.h
>
> diff --git a/hw/qdev-monitor.c b/hw/qdev-monitor.c
> index b22a37a..79f7e6b 100644
> --- a/hw/qdev-monitor.c
> +++ b/hw/qdev-monitor.c
> @@ -42,6 +42,11 @@ static const QDevAlias qdev_alias_table[] = {
>      { "virtio-blk-s390", "virtio-blk", QEMU_ARCH_S390X },
>      { "virtio-net-s390", "virtio-net", QEMU_ARCH_S390X },
>      { "virtio-serial-s390", "virtio-serial", QEMU_ARCH_S390X },
> +    { "virtio-blk-ccw", "virtio-blk", QEMU_ARCH_S390X },
> +    { "virtio-net-ccw", "virtio-net", QEMU_ARCH_S390X },
> +    { "virtio-serial-ccw", "virtio-serial", QEMU_ARCH_S390X },
> +    { "virtio-balloon-ccw", "virtio-balloon", QEMU_ARCH_S390X },
> +    { "virtio-scsi-ccw", "virtio-scsi", QEMU_ARCH_S390X },
>      { "lsi53c895a", "lsi" },
>      { "ich9-ahci", "ahci" },
>      { }
> diff --git a/hw/s390-virtio.c b/hw/s390-virtio.c
> index 47eed35..b8bdf80 100644
> --- a/hw/s390-virtio.c
> +++ b/hw/s390-virtio.c
> @@ -30,8 +30,11 @@
>  #include "hw/sysbus.h"
>  #include "kvm.h"
>  #include "exec-memory.h"
> +#include "qemu-thread.h"
>
>  #include "hw/s390-virtio-bus.h"
> +#include "hw/s390x/css.h"
> +#include "hw/s390x/virtio-ccw.h"
>
>  //#define DEBUG_S390
>
> @@ -46,6 +49,7 @@
>  #define KVM_S390_VIRTIO_NOTIFY          0
>  #define KVM_S390_VIRTIO_RESET           1
>  #define KVM_S390_VIRTIO_SET_STATUS      2
> +#define KVM_S390_VIRTIO_CCW_NOTIFY      3
>
>  #define KERN_IMAGE_START                0x010000UL
>  #define KERN_PARM_AREA                  0x010480UL
> @@ -62,6 +66,7 @@
>
>  static VirtIOS390Bus *s390_bus;
>  static S390CPU **ipi_states;
> +VirtioCcwBus *ccw_bus;
>
>  S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
>  {
> @@ -75,15 +80,21 @@ S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
>  int s390_virtio_hypercall(CPUS390XState *env, uint64_t mem, uint64_t hypercall)
>  {
>      int r = 0, i;
> +    int cssid, ssid, schid, m;
> +    SubchDev *sch;
>
>      dprintf("KVM hypercall: %ld\n", hypercall);
>      switch (hypercall) {
>      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);
> +            if (s390_bus) {
> +                VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
> +                                                                   mem, &i);
> +                if (dev) {
> +                    virtio_queue_notify(dev->vdev, i);
> +                } else {
> +                    r = -EINVAL;
> +                }
>              } else {
>                  r = -EINVAL;
>              }
> @@ -92,28 +103,49 @@ int s390_virtio_hypercall(CPUS390XState *env, uint64_t mem, uint64_t hypercall)
>          }
>          break;
>      case KVM_S390_VIRTIO_RESET:
> -    {
> -        VirtIOS390Device *dev;
> -
> -        dev = s390_virtio_bus_find_mem(s390_bus, mem);
> -        virtio_reset(dev->vdev);
> -        stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
> -        s390_virtio_device_sync(dev);
> -        s390_virtio_reset_idx(dev);
> +        if (s390_bus) {
> +            VirtIOS390Device *dev;
> +
> +            dev = s390_virtio_bus_find_mem(s390_bus, mem);
> +            virtio_reset(dev->vdev);
> +            stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
> +            s390_virtio_device_sync(dev);
> +            s390_virtio_reset_idx(dev);
> +        } else {
> +            r = -EINVAL;
> +        }
>          break;
> -    }
>      case KVM_S390_VIRTIO_SET_STATUS:
> -    {
> -        VirtIOS390Device *dev;
> +        if (s390_bus) {
> +            VirtIOS390Device *dev;
>
> -        dev = s390_virtio_bus_find_mem(s390_bus, mem);
> -        if (dev) {
> -            s390_virtio_device_update_status(dev);
> +            dev = s390_virtio_bus_find_mem(s390_bus, mem);
> +            if (dev) {
> +                s390_virtio_device_update_status(dev);
> +            } else {
> +                r = -EINVAL;
> +            }
>          } else {
>              r = -EINVAL;
>          }
>          break;
> -    }
> +    case KVM_S390_VIRTIO_CCW_NOTIFY:
> +        if (ccw_bus) {
> +            if (ioinst_disassemble_sch_ident(env->regs[2], &m, &cssid, &ssid,
> +                                             &schid)) {
> +                r = -EINVAL;
> +            } else {
> +                sch = css_find_subch(m, cssid, ssid, schid);
> +                if (sch) {
> +                    virtio_queue_notify(virtio_ccw_get_vdev(sch), env->regs[3]);
> +                } else {
> +                    r = -EINVAL;
> +                }
> +            }
> +         } else {
> +             r = -EINVAL;
> +         }
> +         break;
>      default:
>          r = -EINVAL;
>          break;
> @@ -150,58 +182,12 @@ unsigned s390_del_running_cpu(CPUS390XState *env)
>      return s390_running_cpus;
>  }
>
> -/* PC hardware initialisation */
> -static void s390_init(ram_addr_t my_ram_size,
> -                      const char *boot_device,
> -                      const char *kernel_filename,
> -                      const char *kernel_cmdline,
> -                      const char *initrd_filename,
> -                      const char *cpu_model)
> +static CPUS390XState *s390_init_cpus(const char *cpu_model,
> +                                     uint8_t *storage_keys)
>  {
>      CPUS390XState *env = NULL;
> -    MemoryRegion *sysmem = get_system_memory();
> -    MemoryRegion *ram = g_new(MemoryRegion, 1);
> -    ram_addr_t kernel_size = 0;
> -    ram_addr_t initrd_offset;
> -    ram_addr_t initrd_size = 0;
> -    int shift = 0;
> -    uint8_t *storage_keys;
> -    void *virtio_region;
> -    target_phys_addr_t virtio_region_len;
> -    target_phys_addr_t virtio_region_start;
>      int i;
>
> -    /* s390x ram size detection needs a 16bit multiplier + an increment. So
> -       guests > 64GB can be specified in 2MB steps etc. */
> -    while ((my_ram_size >> (20 + shift)) > 65535) {
> -        shift++;
> -    }
> -    my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
> -
> -    /* lets propagate the changed ram size into the global variable. */
> -    ram_size = my_ram_size;
> -
> -    /* get a BUS */
> -    s390_bus = s390_virtio_bus_init(&my_ram_size);
> -
> -    /* allocate RAM */
> -    memory_region_init_ram(ram, "s390.ram", my_ram_size);
> -    vmstate_register_ram_global(ram);
> -    memory_region_add_subregion(sysmem, 0, ram);
> -
> -    /* clear virtio region */
> -    virtio_region_len = my_ram_size - ram_size;
> -    virtio_region_start = ram_size;
> -    virtio_region = cpu_physical_memory_map(virtio_region_start,
> -                                            &virtio_region_len, true);
> -    memset(virtio_region, 0, virtio_region_len);
> -    cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
> -                              virtio_region_len);
> -
> -    /* allocate storage keys */
> -    storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
> -
> -    /* init CPUs */
>      if (cpu_model == NULL) {
>          cpu_model = "host";
>      }
> @@ -222,6 +208,17 @@ static void s390_init(ram_addr_t my_ram_size,
>          tmp_env->exception_index = EXCP_HLT;
>          tmp_env->storage_keys = storage_keys;
>      }
> +    return env;
> +}
> +
> +static void s390_set_up_kernel(CPUS390XState *env,
> +                               const char *kernel_filename,
> +                               const char *kernel_cmdline,
> +                               const char *initrd_filename)
> +{
> +    ram_addr_t kernel_size = 0;
> +    ram_addr_t initrd_offset;
> +    ram_addr_t initrd_size = 0;
>
>      /* One CPU has to run */
>      s390_add_running_cpu(env);
> @@ -294,8 +291,13 @@ static void s390_init(ram_addr_t my_ram_size,
>                 strlen(kernel_cmdline) + 1);
>      }
>
> -    /* Create VirtIO network adapters */
> -    for(i = 0; i < nb_nics; i++) {
> +}
> +
> +static void s390_create_virtio_net(BusState *bus, const char *name)
> +{
> +    int i;
> +
> +    for (i = 0; i < nb_nics; i++) {
>          NICInfo *nd = &nd_table[i];
>          DeviceState *dev;
>
> @@ -308,7 +310,7 @@ static void s390_init(ram_addr_t my_ram_size,
>              exit(1);
>          }
>
> -        dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
> +        dev = qdev_create(bus, name);
>          qdev_set_nic_properties(dev, nd);
>          qdev_init_nofail(dev);
>      }
> @@ -329,6 +331,63 @@ static void s390_init(ram_addr_t my_ram_size,
>      }
>  }
>
> +/* PC hardware initialisation */
> +static void s390_init(ram_addr_t my_ram_size,
> +                      const char *boot_device,
> +                      const char *kernel_filename,
> +                      const char *kernel_cmdline,
> +                      const char *initrd_filename,
> +                      const char *cpu_model)
> +{
> +    CPUS390XState *env = NULL;
> +    MemoryRegion *sysmem = get_system_memory();
> +    MemoryRegion *ram = g_new(MemoryRegion, 1);
> +    int shift = 0;
> +    uint8_t *storage_keys;
> +    void *virtio_region;
> +    target_phys_addr_t virtio_region_len;
> +    target_phys_addr_t virtio_region_start;
> +
> +    /* s390x ram size detection needs a 16bit multiplier + an increment. So
> +       guests > 64GB can be specified in 2MB steps etc. */
> +    while ((my_ram_size >> (20 + shift)) > 65535) {
> +        shift++;
> +    }
> +    my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
> +
> +    /* lets propagate the changed ram size into the global variable. */
> +    ram_size = my_ram_size;
> +
> +    /* get a BUS */
> +    s390_bus = s390_virtio_bus_init(&my_ram_size);
> +
> +    /* allocate RAM */
> +    memory_region_init_ram(ram, "s390.ram", my_ram_size);
> +    vmstate_register_ram_global(ram);
> +    memory_region_add_subregion(sysmem, 0, ram);
> +
> +    /* clear virtio region */
> +    virtio_region_len = my_ram_size - ram_size;
> +    virtio_region_start = ram_size;
> +    virtio_region = cpu_physical_memory_map(virtio_region_start,
> +                                            &virtio_region_len, true);
> +    memset(virtio_region, 0, virtio_region_len);
> +    cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
> +                              virtio_region_len);
> +
> +    /* allocate storage keys */
> +    storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
> +
> +    /* init CPUs */
> +    env = s390_init_cpus(cpu_model, storage_keys);
> +
> +    s390_set_up_kernel(env, kernel_filename, kernel_cmdline, initrd_filename);
> +
> +    /* Create VirtIO network adapters */
> +    s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
> +
> +}
> +
>  static QEMUMachine s390_machine = {
>      .name = "s390-virtio",
>      .alias = "s390",
> @@ -341,7 +400,6 @@ static QEMUMachine s390_machine = {
>      .no_sdcard = 1,
>      .use_virtcon = 1,
>      .max_cpus = 255,
> -    .is_default = 1,
>  };
>
>  static void s390_machine_init(void)
> @@ -350,3 +408,71 @@ static void s390_machine_init(void)
>  }
>
>  machine_init(s390_machine_init);
> +
> +static void ccw_init(ram_addr_t my_ram_size,
> +                     const char *boot_device,
> +                     const char *kernel_filename,
> +                     const char *kernel_cmdline,
> +                     const char *initrd_filename,
> +                     const char *cpu_model)
> +{
> +    CPUS390XState *env = NULL;
> +    MemoryRegion *sysmem = get_system_memory();
> +    MemoryRegion *ram = g_new(MemoryRegion, 1);
> +    int shift = 0;
> +    uint8_t *storage_keys;
> +
> +    /* s390x ram size detection needs a 16bit multiplier + an increment. So
> +       guests > 64GB can be specified in 2MB steps etc. */
> +    while ((my_ram_size >> (20 + shift)) > 65535) {
> +        shift++;
> +    }
> +    my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
> +
> +    /* lets propagate the changed ram size into the global variable. */
> +    ram_size = my_ram_size;
> +
> +    /* get a BUS */
> +    ccw_bus = virtio_ccw_bus_init();
> +
> +    /* allocate RAM */
> +    memory_region_init_ram(ram, "s390.ram", my_ram_size);
> +    vmstate_register_ram_global(ram);
> +    memory_region_add_subregion(sysmem, 0, ram);
> +
> +    /* allocate storage keys */
> +    storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
> +
> +    /* init CPUs */
> +    env = s390_init_cpus(cpu_model, storage_keys);
> +
> +    kvm_s390_enable_css_support(env);
> +
> +    s390_set_up_kernel(env, kernel_filename, kernel_cmdline, initrd_filename);
> +
> +    /* Create VirtIO network adapters */
> +    s390_create_virtio_net((BusState *)ccw_bus, "virtio-net-ccw");
> +
> +}
> +
> +static QEMUMachine ccw_machine = {
> +    .name = "s390-ccw-virtio",
> +    .alias = "s390-ccw",
> +    .desc = "VirtIO-ccw based S390 machine",
> +    .init = ccw_init,
> +    .no_cdrom = 1,
> +    .no_floppy = 1,
> +    .no_serial = 1,
> +    .no_parallel = 1,
> +    .no_sdcard = 1,
> +    .use_virtcon = 1,
> +    .max_cpus = 255,
> +    .is_default = 1,
> +};
> +
> +static void ccw_machine_init(void)
> +{
> +    qemu_register_machine(&ccw_machine);
> +}
> +
> +machine_init(ccw_machine_init);
> diff --git a/hw/s390x/Makefile.objs b/hw/s390x/Makefile.objs
> index 93b41fb..e4c3d6f 100644
> --- a/hw/s390x/Makefile.objs
> +++ b/hw/s390x/Makefile.objs
> @@ -2,3 +2,4 @@ obj-y = s390-virtio-bus.o s390-virtio.o
>
>  obj-y := $(addprefix ../,$(obj-y))
>  obj-y += css.o
> +obj-y += virtio-ccw.o
> diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> new file mode 100644
> index 0000000..8a90c3a
> --- /dev/null
> +++ b/hw/s390x/virtio-ccw.c
> @@ -0,0 +1,962 @@
> +/*
> + * virtio ccw target implementation
> + *
> + * Copyright 2012 IBM Corp.
> + * Author(s): Cornelia Huck <cornelia.huck@xxxxxxxxxx>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or (at
> + * your option) any later version. See the COPYING file in the top-level
> + * directory.
> + */
> +
> +#include <hw/hw.h>
> +#include "block.h"
> +#include "blockdev.h"
> +#include "sysemu.h"
> +#include "net.h"
> +#include "monitor.h"
> +#include "qemu-thread.h"
> +#include "../virtio.h"
> +#include "../virtio-serial.h"
> +#include "../virtio-net.h"
> +#include "../sysbus.h"

"hw/virtio..." for the above

> +#include "bitops.h"
> +
> +#include "ioinst.h"
> +#include "css.h"
> +#include "virtio-ccw.h"
> +
> +static const TypeInfo virtio_ccw_bus_info = {
> +    .name = TYPE_VIRTIO_CCW_BUS,
> +    .parent = TYPE_BUS,
> +    .instance_size = sizeof(VirtioCcwBus),
> +};
> +
> +static const VirtIOBindings virtio_ccw_bindings;
> +
> +typedef struct sch_entry {
> +    SubchDev *sch;
> +    QLIST_ENTRY(sch_entry) entry;
> +} sch_entry;

SubchEntry, see CODING_STYLE. Also other struct and typedef names below.

> +
> +QLIST_HEAD(subch_list, sch_entry);

static, but please put this to a structure that is passed around instead.

> +
> +typedef struct devno_entry {
> +    uint16_t devno;
> +    QLIST_ENTRY(devno_entry) entry;
> +} devno_entry;
> +
> +QLIST_HEAD(devno_list, devno_entry);

Ditto

> +
> +struct subch_set {
> +    struct subch_list *s_list[256];
> +    struct devno_list *d_list[256];
> +};
> +
> +struct css_set {
> +    struct subch_set *set[MAX_SSID + 1];
> +};
> +
> +static struct css_set *channel_subsys[MAX_CSSID + 1];
> +
> +VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch)
> +{
> +    VirtIODevice *vdev = NULL;
> +
> +    if (sch->driver_data) {
> +        vdev = ((VirtioCcwData *)sch->driver_data)->vdev;
> +    }
> +    return vdev;
> +}
> +
> +static SubchDev *virtio_ccw_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid,
> +                                       uint16_t schid)
> +{
> +    struct sch_entry *sch_entry;
> +    struct subch_list *list;
> +    SubchDev *sch = NULL;
> +    uint8_t real_cssid;
> +
> +    real_cssid = (!m && (cssid == 0)) ? VIRTUAL_CSSID : cssid;
> +    if (!channel_subsys[real_cssid]) {
> +        return NULL;
> +    }
> +    if (!channel_subsys[real_cssid]->set[ssid]) {
> +        return NULL;
> +    }
> +    if (!channel_subsys[real_cssid]->set[ssid]->s_list[schid >> 8]) {
> +        return NULL;
> +    }
> +
> +    list = channel_subsys[real_cssid]->set[ssid]->s_list[schid >> 8];
> +
> +    QLIST_FOREACH(sch_entry, list, entry) {
> +        if (sch_entry->sch->schid == schid) {
> +            sch = sch_entry->sch;
> +            break;
> +        }
> +    }
> +
> +    return sch;
> +}
> +
> +static bool virtio_ccw_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno)
> +{
> +    struct devno_entry *devno_entry;
> +    struct devno_list *list;
> +    bool found = false;
> +
> +    if (!channel_subsys[cssid]) {
> +        return false;
> +    }
> +    if (!channel_subsys[cssid]->set[ssid]) {
> +        return false;
> +    }
> +    if (!channel_subsys[cssid]->set[ssid]->d_list[devno >> 8]) {
> +        return false;
> +    }
> +
> +    list = channel_subsys[cssid]->set[ssid]->d_list[devno >> 8];
> +
> +    QLIST_FOREACH(devno_entry, list, entry) {
> +        if (devno_entry->devno == devno) {
> +            found = true;
> +            break;
> +        }
> +    }
> +
> +    return found;
> +}
> +
> +static void virtio_ccw_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid,
> +                                    uint16_t devno, SubchDev *sch)
> +{
> +    struct css_set *css;
> +    struct subch_set *s_set;
> +    struct subch_list *s_list;
> +    struct devno_list *d_list;
> +    struct sch_entry *sch_entry, *tmp;
> +    struct devno_entry *devno_entry, *d_tmp;
> +
> +    if (!channel_subsys[cssid]) {
> +        channel_subsys[cssid] = g_malloc0(sizeof(*channel_subsys[cssid]));
> +    }
> +    css = channel_subsys[cssid];
> +
> +    if (!css->set[ssid]) {
> +        css->set[ssid] = g_malloc0(sizeof(*css->set[ssid]));
> +    }
> +    s_set = css->set[ssid];
> +
> +    if (!s_set->s_list[schid >> 8]) {
> +        s_set->s_list[schid >> 8] =
> +            g_malloc0(sizeof(*s_set->s_list[schid >> 8]));
> +        QLIST_INIT(s_set->s_list[schid >> 8]);
> +    }
> +    s_list = s_set->s_list[schid >> 8];
> +
> +    if (!s_set->d_list[devno >> 8]) {
> +        s_set->d_list[devno >> 8] =
> +            g_malloc0(sizeof(*s_set->d_list[devno >> 8]));
> +        QLIST_INIT(s_set->d_list[devno >> 8]);
> +    }
> +    d_list = s_set->d_list[devno >> 8];
> +
> +    if (sch) {
> +        sch_entry = g_malloc0(sizeof(sch_entry));
> +        sch_entry->sch = sch;
> +        QLIST_INSERT_HEAD(s_list, sch_entry, entry);
> +        devno_entry = g_malloc0(sizeof(devno_entry));
> +        devno_entry->devno = devno;
> +        QLIST_INSERT_HEAD(d_list, devno_entry, entry);
> +    } else {
> +        QLIST_FOREACH_SAFE(sch_entry, s_list, entry, tmp) {
> +            if (sch_entry->sch->schid == schid) {
> +                QLIST_REMOVE(sch_entry, entry);
> +                g_free(sch_entry);
> +                break;
> +            }
> +        }
> +        QLIST_FOREACH_SAFE(devno_entry, d_list, entry, d_tmp) {
> +            if (devno_entry->devno == devno) {
> +                QLIST_REMOVE(devno_entry, entry);
> +                g_free(devno_entry);
> +                break;
> +            }
> +        }
> +    }
> +}
> +
> +VirtioCcwBus *virtio_ccw_bus_init(void)
> +{
> +    VirtioCcwBus *bus;
> +    BusState *_bus;

Please avoid identifiers with leading underscores.

> +    DeviceState *dev;
> +
> +    css_set_subch_cb(virtio_ccw_find_subch);
> +
> +    /* Create bridge device */
> +    dev = qdev_create(NULL, "virtio-ccw-bridge");
> +    qdev_init_nofail(dev);
> +
> +    /* Create bus on bridge device */
> +    _bus = qbus_create(TYPE_VIRTIO_CCW_BUS, dev, "virtio-ccw");
> +    bus = DO_UPCAST(VirtioCcwBus, bus, _bus);
> +
> +    /* Enable hotplugging */
> +    _bus->allow_hotplug = 1;
> +
> +    return bus;
> +}
> +
> +struct vq_info_block {
> +    uint64_t queue;
> +    uint16_t num;
> +} QEMU_PACKED;
> +
> +struct vq_config_block {
> +    uint16_t index;
> +    uint16_t num;
> +} QEMU_PACKED;

Aren't these KVM structures? They should be defined in a KVM header
file file in linux-headers.

> +
> +/* Specify where the virtqueues for the subchannel are in guest memory. */
> +static int virtio_ccw_set_vqs(SubchDev *sch, uint64_t addr, uint16_t num)
> +{
> +    VirtioCcwData *data = sch->driver_data;
> +
> +    if (num > VIRTIO_PCI_QUEUE_MAX) {
> +        return -EINVAL;
> +    }
> +
> +    if (!data) {
> +        return -EINVAL;
> +    }
> +
> +    virtio_queue_set_addr(data->vdev, num, addr);
> +    if (!addr) {
> +        virtio_queue_set_vector(data->vdev, num, 0);
> +    } else {
> +        virtio_queue_set_vector(data->vdev, num, num);
> +    }
> +    return 0;
> +}
> +
> +static int virtio_ccw_cb(SubchDev *sch, struct ccw1 *ccw)
> +{
> +    int ret;
> +    struct vq_info_block info;
> +    uint8_t status;
> +    uint32_t features;
> +    void *config;
> +    uint64_t *indicators;
> +    struct vq_config_block vq_config;
> +    VirtioCcwData *data = sch->driver_data;
> +    bool check_len;
> +    int len;
> +
> +    if (!ccw) {
> +        return -EIO;
> +    }
> +
> +    if (!data) {
> +        return -EINVAL;
> +    }
> +
> +    check_len = !((ccw->flags & CCW_FLAG_SLI) && !(ccw->flags & CCW_FLAG_DC));
> +
> +    /* Look at the command. */
> +    switch (ccw->cmd_code) {
> +    case CCW_CMD_SET_VQ:
> +        if (check_len) {
> +            if (ccw->count != sizeof(info)) {
> +                ret = -EINVAL;
> +                break;
> +            }
> +        } else if (ccw->count < sizeof(info)) {
> +            /* Can't execute command. */
> +            ret = -EINVAL;
> +            break;
> +        }
> +        if (!qemu_get_ram_ptr(ccw->cda)) {
> +            ret = -EFAULT;
> +        } else {
> +            info.queue = ldq_phys(ccw->cda);
> +            info.num = lduw_phys(ccw->cda + sizeof(info.queue));
> +            ret = virtio_ccw_set_vqs(sch, info.queue, info.num);
> +            sch->curr_status.scsw.count = 0;
> +        }
> +        break;
> +    case CCW_CMD_VDEV_RESET:
> +        virtio_reset(data->vdev);
> +        ret = 0;
> +        break;
> +    case CCW_CMD_READ_FEAT:
> +        if (check_len) {
> +            if (ccw->count != sizeof(data->host_features)) {
> +                ret = -EINVAL;
> +                break;
> +            }
> +        } else if (ccw->count < sizeof(data->host_features)) {
> +            /* Can't execute command. */
> +            ret = -EINVAL;
> +            break;
> +        }
> +        if (!qemu_get_ram_ptr(ccw->cda)) {
> +            ret = -EFAULT;
> +        } else {
> +            stl_le_phys(ccw->cda, data->host_features);
> +            sch->curr_status.scsw.count =
> +                ccw->count - sizeof(data->host_features);
> +            ret = 0;
> +        }
> +        break;
> +    case CCW_CMD_WRITE_FEAT:
> +        if (check_len) {
> +            if (ccw->count != sizeof(data->vdev->guest_features)) {
> +                ret = -EINVAL;
> +                break;
> +            }
> +        } else if (ccw->count < sizeof(data->vdev->guest_features)) {
> +            /* Can't execute command. */
> +            ret = -EINVAL;
> +            break;
> +        }
> +        if (!qemu_get_ram_ptr(ccw->cda)) {
> +            ret = -EFAULT;
> +        } else {
> +            features = bswap32(ldl_phys(ccw->cda));
> +            if (data->vdev->set_features) {
> +                data->vdev->set_features(data->vdev, features);
> +            }
> +            data->vdev->guest_features = features;
> +            sch->curr_status.scsw.count =
> +                ccw->count - sizeof(data->vdev->guest_features);
> +            ret = 0;
> +        }
> +        break;
> +    case CCW_CMD_READ_CONF:
> +        if (check_len) {
> +            if (ccw->count > data->vdev->config_len) {
> +                ret = -EINVAL;
> +                break;
> +            }
> +        }
> +        len = MIN(ccw->count, data->vdev->config_len);
> +        if (!qemu_get_ram_ptr(ccw->cda)) {
> +            ret = -EFAULT;
> +        } else {
> +            data->vdev->get_config(data->vdev, data->vdev->config);
> +            cpu_physical_memory_write(ccw->cda, data->vdev->config, len);
> +            sch->curr_status.scsw.count = ccw->count - len;
> +            ret = 0;
> +        }
> +        break;
> +    case CCW_CMD_WRITE_CONF:
> +        if (check_len) {
> +            if (ccw->count > data->vdev->config_len) {
> +                ret = -EINVAL;
> +                break;
> +            }
> +        }
> +        len = MIN(ccw->count, data->vdev->config_len);
> +        config = qemu_get_ram_ptr(ccw->cda);

Please use cpu_physical_memory_read() (or DMA versions) instead of
this + memcpy().

> +        if (!config) {
> +            ret = -EFAULT;
> +        } else {
> +            memcpy(data->vdev->config, config, len);
> +            if (data->vdev->set_config) {
> +                data->vdev->set_config(data->vdev, data->vdev->config);
> +            }
> +            sch->curr_status.scsw.count = ccw->count - len;
> +            ret = 0;
> +        }
> +        break;
> +    case CCW_CMD_WRITE_STATUS:
> +        if (check_len) {
> +            if (ccw->count != sizeof(status)) {
> +                ret = -EINVAL;
> +                break;
> +            }
> +        } else if (ccw->count < sizeof(status)) {
> +            /* Can't execute command. */
> +            ret = -EINVAL;
> +            break;
> +        }
> +        if (!qemu_get_ram_ptr(ccw->cda)) {
> +            ret = -EFAULT;
> +        } else {
> +            status = ldub_phys(ccw->cda);
> +            virtio_set_status(data->vdev, status);
> +            sch->curr_status.scsw.count = ccw->count - sizeof(status);
> +            ret = 0;
> +        }
> +        break;
> +    case CCW_CMD_SET_IND:
> +        if (check_len) {
> +            if (ccw->count != sizeof(*indicators)) {
> +                ret = -EINVAL;
> +                break;
> +            }
> +        } else if (ccw->count < sizeof(*indicators)) {
> +            /* Can't execute command. */
> +            ret = -EINVAL;
> +            break;
> +        }
> +        indicators = qemu_get_ram_ptr(ccw->cda);
> +        if (!indicators) {
> +            ret = -EFAULT;
> +        } else {
> +            data->indicators = ccw->cda;
> +            sch->curr_status.scsw.count = ccw->count - sizeof(*indicators);
> +            ret = 0;
> +        }
> +        break;
> +    case CCW_CMD_READ_VQ_CONF:
> +        if (check_len) {
> +            if (ccw->count != sizeof(vq_config)) {
> +                ret = -EINVAL;
> +                break;
> +            }
> +        } else if (ccw->count < sizeof(vq_config)) {
> +            /* Can't execute command. */
> +            ret = -EINVAL;
> +            break;
> +        }
> +        if (!qemu_get_ram_ptr(ccw->cda)) {
> +            ret = -EFAULT;
> +        } else {
> +            vq_config.index = lduw_phys(ccw->cda);

lduw_{b,l}e_phys()

> +            vq_config.num = virtio_queue_get_num(data->vdev, vq_config.index);
> +            stw_phys(ccw->cda + sizeof(vq_config.index), vq_config.num);

stw_{b,l]e_phys(), likewise elsewhere.

> +            sch->curr_status.scsw.count = ccw->count - sizeof(vq_config);
> +            ret = 0;
> +        }
> +        break;
> +    default:
> +        ret = -EOPNOTSUPP;
> +        break;
> +    }
> +    return ret;
> +}
> +
> +static int virtio_ccw_device_init(VirtioCcwData *dev, VirtIODevice *vdev)
> +{
> +    unsigned int cssid = 0;
> +    unsigned int ssid = 0;
> +    unsigned int schid;
> +    unsigned int devno;
> +    bool have_devno = false;
> +    bool found = false;
> +    SubchDev *sch;
> +    int ret;
> +    int num;
> +
> +    sch = g_malloc0(sizeof(SubchDev));
> +
> +    sch->driver_data = dev;
> +    dev->sch = sch;
> +
> +    dev->vdev = vdev;
> +    dev->indicators = 0;
> +
> +    /* Initialize subchannel structure. */
> +    qemu_mutex_init(&sch->mutex);
> +    sch->channel_prog = NULL;
> +    sch->last_cmd = NULL;
> +    sch->orb = NULL;
> +    /*
> +     * Use a device number if provided. Otherwise, fall back to subchannel
> +     * number.
> +     */
> +    if (dev->bus_id) {
> +        num = sscanf(dev->bus_id, "%x.%x.%04x", &cssid, &ssid, &devno);
> +        if (num == 3) {
> +            if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) {
> +                ret = -EINVAL;
> +                goto out_err;
> +            }
> +            /* Enforce use of virtual cssid. */
> +            if (cssid != VIRTUAL_CSSID) {
> +                ret = -EINVAL;
> +                goto out_err;
> +            }
> +            if (virtio_ccw_devno_used(cssid, ssid, devno)) {
> +                ret = -EEXIST;
> +                goto out_err;
> +            }
> +            sch->cssid = cssid;
> +            sch->ssid = ssid;
> +            sch->devno = devno;
> +            have_devno = true;
> +        } else {
> +            ret = -EINVAL;
> +            goto out_err;
> +        }
> +    }
> +
> +    /* Find the next free id. */
> +    if (have_devno) {
> +        for (schid = 0; schid <= MAX_SCHID; schid++) {
> +            if (!virtio_ccw_find_subch(1, cssid, ssid, schid)) {
> +                sch->schid = schid;
> +                virtio_ccw_subch_assign(cssid, ssid, schid, devno, sch);
> +                found = true;
> +                break;
> +            }
> +        }
> +        if (!found) {
> +            ret = -ENODEV;
> +            goto out_err;
> +        }
> +    } else {
> +        cssid = VIRTUAL_CSSID;
> +        for (ssid = 0; ssid <= MAX_SSID; ssid++) {
> +            for (schid = 0; schid <= MAX_SCHID; schid++) {
> +                if (!virtio_ccw_find_subch(1, cssid, ssid, schid)) {
> +                    sch->cssid = cssid;
> +                    sch->ssid = ssid;
> +                    sch->schid = schid;
> +                    devno = schid;
> +                    /*
> +                     * If the devno is already taken, look further in this
> +                     * subchannel set.
> +                     */
> +                    while (virtio_ccw_devno_used(cssid, ssid, devno)) {
> +                        if (devno == MAX_SCHID) {
> +                            devno = 0;
> +                        } else if (devno == schid - 1) {
> +                            ret = -ENODEV;
> +                            goto out_err;
> +                        } else {
> +                            devno++;
> +                        }
> +                    }
> +                    sch->devno = devno;
> +                    virtio_ccw_subch_assign(cssid, ssid, schid, devno, sch);
> +                    found = true;
> +                    break;
> +                }
> +            }
> +            if (found) {
> +                break;
> +            }
> +        }
> +        if (!found) {
> +            ret = -ENODEV;
> +            goto out_err;
> +        }
> +    }
> +
> +    /* Build initial schib. */
> +    css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE);
> +
> +    sch->ccw_cb = virtio_ccw_cb;
> +
> +    /* Build senseid data. */
> +    memset(&sch->id, 0, sizeof(struct senseid));
> +    sch->id.reserved = 0xff;
> +    sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
> +    sch->id.cu_model = dev->vdev->device_id;
> +
> +    virtio_bind_device(vdev, &virtio_ccw_bindings, dev);
> +    dev->host_features = vdev->get_features(vdev, dev->host_features);
> +
> +    s390_sch_hotplug(sch->cssid, sch->ssid, sch->schid, sch->devno,
> +                     &sch->curr_status, dev->qdev.hotplugged, 1, 1);
> +    return 0;
> +
> +out_err:
> +    dev->sch = NULL;
> +    g_free(sch);
> +    return ret;
> +}
> +
> +static int virtio_ccw_exit(VirtioCcwData *dev)
> +{
> +    SubchDev *sch = dev->sch;
> +
> +    if (sch) {
> +        virtio_ccw_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno,
> +                                NULL);
> +        g_free(sch);
> +    }
> +    dev->indicators = 0;
> +    return 0;
> +}
> +
> +static int virtio_ccw_net_init(VirtioCcwData *dev)
> +{
> +    VirtIODevice *vdev;
> +
> +    vdev = virtio_net_init((DeviceState *)dev, &dev->nic, &dev->net);
> +    if (!vdev) {
> +        return -1;
> +    }
> +
> +    return virtio_ccw_device_init(dev, vdev);
> +}
> +
> +static int virtio_ccw_net_exit(VirtioCcwData *dev)
> +{
> +    virtio_net_exit(dev->vdev);
> +    return virtio_ccw_exit(dev);
> +}
> +
> +static int virtio_ccw_blk_init(VirtioCcwData *dev)
> +{
> +    VirtIODevice *vdev;
> +
> +    vdev = virtio_blk_init((DeviceState *)dev, &dev->blk);
> +    if (!vdev) {
> +        return -1;
> +    }
> +
> +    return virtio_ccw_device_init(dev, vdev);
> +}
> +
> +static int virtio_ccw_blk_exit(VirtioCcwData *dev)
> +{
> +    virtio_blk_exit(dev->vdev);
> +    blockdev_mark_auto_del(dev->blk.conf.bs);
> +    return virtio_ccw_exit(dev);
> +}
> +
> +static int virtio_ccw_serial_init(VirtioCcwData *dev)
> +{
> +    VirtioCcwBus *bus;
> +    VirtIODevice *vdev;
> +    int r;
> +
> +    bus = DO_UPCAST(VirtioCcwBus, bus, dev->qdev.parent_bus);
> +
> +    vdev = virtio_serial_init((DeviceState *)dev, &dev->serial);
> +    if (!vdev) {
> +        return -1;
> +    }
> +
> +    r = virtio_ccw_device_init(dev, vdev);
> +    if (!r) {
> +        bus->console = dev;
> +    }
> +
> +    return r;
> +}
> +
> +static int virtio_ccw_serial_exit(VirtioCcwData *dev)
> +{
> +    VirtioCcwBus *bus;
> +
> +    bus = DO_UPCAST(VirtioCcwBus, bus, dev->qdev.parent_bus);
> +    bus->console = NULL;
> +    virtio_serial_exit(dev->vdev);
> +    return virtio_ccw_exit(dev);
> +}
> +
> +static int virtio_ccw_balloon_init(VirtioCcwData *dev)
> +{
> +    VirtIODevice *vdev;
> +
> +    vdev = virtio_balloon_init((DeviceState *)dev);
> +    if (!vdev) {
> +        return -1;
> +    }
> +
> +    return virtio_ccw_device_init(dev, vdev);
> +}
> +
> +static int virtio_ccw_balloon_exit(VirtioCcwData *dev)
> +{
> +    virtio_balloon_exit(dev->vdev);
> +    return virtio_ccw_exit(dev);
> +}
> +
> +static int virtio_ccw_scsi_init(VirtioCcwData *dev)
> +{
> +    VirtIODevice *vdev;
> +
> +    vdev = virtio_scsi_init((DeviceState *)dev, &dev->scsi);
> +    if (!vdev) {
> +        return -1;
> +    }
> +
> +    return virtio_ccw_device_init(dev, vdev);
> +}
> +
> +static int virtio_ccw_scsi_exit(VirtioCcwData *dev)
> +{
> +    virtio_scsi_exit(dev->vdev);
> +    return virtio_ccw_exit(dev);
> +}
> +
> +VirtioCcwData *virtio_ccw_bus_console(VirtioCcwBus *bus)
> +{
> +    return bus->console;
> +}
> +
> +static void virtio_ccw_notify(void *opaque, uint16_t vector)
> +{
> +    VirtioCcwData *dev = opaque;
> +    SubchDev *sch = dev->sch;
> +    uint64_t indicators;
> +
> +    if (vector >= VIRTIO_PCI_QUEUE_MAX) {
> +        return;
> +    }
> +
> +    qemu_mutex_lock(&sch->mutex);
> +    indicators = ldq_phys(dev->indicators);
> +    set_bit(vector, &indicators);
> +    stq_phys(dev->indicators, indicators);
> +
> +    css_conditional_io_interrupt(sch);
> +
> +    qemu_mutex_unlock(&sch->mutex);
> +}
> +
> +static unsigned virtio_ccw_get_features(void *opaque)
> +{
> +    VirtioCcwData *dev = opaque;
> +
> +    return dev->host_features;
> +}
> +
> +void virtio_ccw_reset_subchannels(struct VirtioCcwBus *bus)
> +{
> +    BusChild *kid;
> +    VirtioCcwData *data;
> +
> +    QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
> +        data = (VirtioCcwData *)kid->child;
> +        virtio_reset(data->vdev);
> +        css_reset_sch(data->sch);
> +    }
> +}
> +
> +/**************** Virtio-ccw Bus Device Descriptions *******************/
> +
> +static const VirtIOBindings virtio_ccw_bindings = {
> +    .notify = virtio_ccw_notify,
> +    .get_features = virtio_ccw_get_features,
> +};
> +
> +static Property virtio_ccw_net_properties[] = {
> +    DEFINE_PROP_STRING("devno", VirtioCcwData, bus_id),
> +    DEFINE_NIC_PROPERTIES(VirtioCcwData, nic),
> +    DEFINE_PROP_UINT32("x-txtimer", VirtioCcwData,
> +                       net.txtimer, TX_TIMER_INTERVAL),
> +    DEFINE_PROP_INT32("x-txburst", VirtioCcwData,
> +                      net.txburst, TX_BURST),
> +    DEFINE_PROP_STRING("tx", VirtioCcwData, net.tx),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void virtio_ccw_net_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
> +
> +    k->init = virtio_ccw_net_init;
> +    k->exit = virtio_ccw_net_exit;
> +    dc->props = virtio_ccw_net_properties;
> +}
> +
> +static TypeInfo virtio_ccw_net = {
> +    .name          = "virtio-net-ccw",
> +    .parent        = TYPE_VIRTIO_CCW_DEVICE,
> +    .instance_size = sizeof(VirtioCcwData),
> +    .class_init    = virtio_ccw_net_class_init,
> +};
> +
> +static Property virtio_ccw_blk_properties[] = {
> +    DEFINE_PROP_STRING("devno", VirtioCcwData, bus_id),
> +    DEFINE_BLOCK_PROPERTIES(VirtioCcwData, blk.conf),
> +    DEFINE_PROP_STRING("serial", VirtioCcwData, blk.serial),
> +#ifdef __linux__
> +    DEFINE_PROP_BIT("scsi", VirtioCcwData, blk.scsi, 0, true),
> +#endif
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void virtio_ccw_blk_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
> +
> +    k->init = virtio_ccw_blk_init;
> +    k->exit = virtio_ccw_blk_exit;
> +    dc->props = virtio_ccw_blk_properties;
> +}
> +
> +static TypeInfo virtio_ccw_blk = {
> +    .name          = "virtio-blk-ccw",
> +    .parent        = TYPE_VIRTIO_CCW_DEVICE,
> +    .instance_size = sizeof(VirtioCcwData),
> +    .class_init    = virtio_ccw_blk_class_init,
> +};
> +
> +static Property virtio_ccw_serial_properties[] = {
> +    DEFINE_PROP_STRING("devno", VirtioCcwData, bus_id),
> +    DEFINE_PROP_UINT32("max_ports", VirtioCcwData, serial.max_virtserial_ports,
> +                       31),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void virtio_ccw_serial_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
> +
> +    k->init = virtio_ccw_serial_init;
> +    k->exit = virtio_ccw_serial_exit;
> +    dc->props = virtio_ccw_serial_properties;
> +}
> +
> +static TypeInfo virtio_ccw_serial = {
> +    .name          = "virtio-serial-ccw",
> +    .parent        = TYPE_VIRTIO_CCW_DEVICE,
> +    .instance_size = sizeof(VirtioCcwData),
> +    .class_init    = virtio_ccw_serial_class_init,
> +};
> +
> +static Property virtio_ccw_balloon_properties[] = {
> +    DEFINE_PROP_STRING("devno", VirtioCcwData, bus_id),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void virtio_ccw_balloon_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
> +
> +    k->init = virtio_ccw_balloon_init;
> +    k->exit = virtio_ccw_balloon_exit;
> +    dc->props = virtio_ccw_balloon_properties;
> +}
> +
> +static TypeInfo virtio_ccw_balloon = {
> +    .name          = "virtio-balloon-ccw",
> +    .parent        = TYPE_VIRTIO_CCW_DEVICE,
> +    .instance_size = sizeof(VirtioCcwData),
> +    .class_init    = virtio_ccw_balloon_class_init,
> +};
> +
> +static Property virtio_ccw_scsi_properties[] = {
> +    DEFINE_PROP_STRING("devno", VirtioCcwData, bus_id),
> +    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtioCcwData, host_features, scsi),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void virtio_ccw_scsi_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
> +
> +    k->init = virtio_ccw_scsi_init;
> +    k->exit = virtio_ccw_scsi_exit;
> +    dc->props = virtio_ccw_scsi_properties;
> +}
> +
> +static TypeInfo virtio_ccw_scsi = {
> +    .name          = "virtio-scsi-ccw",
> +    .parent        = TYPE_VIRTIO_CCW_DEVICE,
> +    .instance_size = sizeof(VirtioCcwData),
> +    .class_init    = virtio_ccw_scsi_class_init,
> +};
> +
> +static int virtio_ccw_busdev_init(DeviceState *dev)
> +{
> +    VirtioCcwData *_dev = (VirtioCcwData *)dev;
> +    VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
> +
> +    return _info->init(_dev);
> +}
> +
> +static int virtio_ccw_busdev_exit(DeviceState *dev)
> +{
> +    VirtioCcwData *_dev = (VirtioCcwData *)dev;
> +    VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
> +
> +    return _info->exit(_dev);
> +}
> +
> +static int virtio_ccw_busdev_unplug(DeviceState *dev)
> +{
> +    VirtioCcwData *_dev = (VirtioCcwData *)dev;
> +    SubchDev *sch = _dev->sch;
> +
> +    /*
> +     * We should arrive here only for device_del, since we don't support
> +     * direct hot(un)plug of channels, but only through virtio.
> +     */
> +    assert(sch != NULL);
> +    /* Subchannel is now disabled and no longer valid. */
> +    qemu_mutex_lock(&sch->mutex);
> +    sch->curr_status.pmcw.ena = 0;
> +    sch->curr_status.pmcw.dnv = 0;
> +    qemu_mutex_unlock(&sch->mutex);
> +
> +    s390_sch_hotplug(sch->cssid, sch->ssid, sch->schid, sch->devno,
> +                     &sch->curr_status, 1, 0, 1);
> +
> +    object_unparent(OBJECT(dev));
> +    qdev_free(dev);
> +    return 0;
> +}
> +
> +static void virtio_ccw_device_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +
> +    dc->init = virtio_ccw_busdev_init;
> +    dc->exit = virtio_ccw_busdev_exit;
> +    dc->unplug = virtio_ccw_busdev_unplug;
> +    dc->bus_type = TYPE_VIRTIO_CCW_BUS;
> +
> +}
> +
> +static TypeInfo virtio_ccw_device_info = {
> +    .name = TYPE_VIRTIO_CCW_DEVICE,
> +    .parent = TYPE_DEVICE,
> +    .instance_size = sizeof(VirtioCcwData),
> +    .class_init = virtio_ccw_device_class_init,
> +    .class_size = sizeof(VirtIOCCWDeviceClass),
> +    .abstract = true,
> +};
> +
> +/***************** Virtio-ccw Bus Bridge Device ********************/
> +/* Only required to have the virtio bus as child in the system bus */
> +
> +static int virtio_ccw_bridge_init(SysBusDevice *dev)
> +{
> +    /* nothing */
> +    return 0;
> +}
> +
> +static void virtio_ccw_bridge_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
> +
> +    k->init = virtio_ccw_bridge_init;
> +    dc->no_user = 1;
> +}
> +
> +static TypeInfo virtio_ccw_bridge_info = {
> +    .name          = "virtio-ccw-bridge",
> +    .parent        = TYPE_SYS_BUS_DEVICE,
> +    .instance_size = sizeof(SysBusDevice),
> +    .class_init    = virtio_ccw_bridge_class_init,
> +};
> +
> +static void virtio_ccw_register(void)
> +{
> +    type_register_static(&virtio_ccw_bus_info);
> +    type_register_static(&virtio_ccw_device_info);
> +    type_register_static(&virtio_ccw_serial);
> +    type_register_static(&virtio_ccw_blk);
> +    type_register_static(&virtio_ccw_net);
> +    type_register_static(&virtio_ccw_balloon);
> +    type_register_static(&virtio_ccw_scsi);
> +    type_register_static(&virtio_ccw_bridge_info);
> +}
> +type_init(virtio_ccw_register);
> diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h
> new file mode 100644
> index 0000000..ee198d6
> --- /dev/null
> +++ b/hw/s390x/virtio-ccw.h
> @@ -0,0 +1,77 @@
> +/*
> + * virtio ccw target definitions
> + *
> + * Copyright 2012 IBM Corp.
> + * Author(s): Cornelia Huck <cornelia.huck@xxxxxxxxxx>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or (at
> + * your option) any later version. See the COPYING file in the top-level
> + * directory.
> + */
> +
> +#include <hw/virtio-blk.h>
> +#include <hw/virtio-net.h>
> +#include <hw/virtio-serial.h>
> +#include <hw/virtio-scsi.h>
> +
> +#define VIRTUAL_CSSID 0xfe
> +
> +#define VIRTIO_CCW_CU_TYPE 0x3832
> +#define VIRTIO_CCW_CHPID_TYPE 0x32
> +
> +#define CCW_CMD_SET_VQ       0x13
> +#define CCW_CMD_VDEV_RESET   0x33
> +#define CCW_CMD_READ_FEAT    0x12
> +#define CCW_CMD_WRITE_FEAT   0x11
> +#define CCW_CMD_READ_CONF    0x22
> +#define CCW_CMD_WRITE_CONF   0x21
> +#define CCW_CMD_WRITE_STATUS 0x31
> +#define CCW_CMD_SET_IND      0x43
> +#define CCW_CMD_READ_VQ_CONF 0x32
> +
> +#define TYPE_VIRTIO_CCW_DEVICE "virtio-ccw-device"
> +#define VIRTIO_CCW_DEVICE(obj) \
> +     OBJECT_CHECK(VirtioCcwData, (obj), TYPE_VIRTIO_CCW_DEVICE)
> +#define VIRTIO_CCW_DEVICE_CLASS(klass) \
> +     OBJECT_CLASS_CHECK(VirtIOCCWDeviceClass, (klass), TYPE_VIRTIO_CCW_DEVICE)
> +#define VIRTIO_CCW_DEVICE_GET_CLASS(obj) \
> +     OBJECT_GET_CLASS(VirtIOCCWDeviceClass, (obj), TYPE_VIRTIO_CCW_DEVICE)
> +
> +#define TYPE_VIRTIO_CCW_BUS "virtio-ccw-bus"
> +#define VIRTIO_CCW_BUS(obj) \
> +     OBJECT_CHECK(VirtioCcwBus, (obj), TYPE_VIRTIO_CCW_BUS)
> +
> +typedef struct VirtioCcwData VirtioCcwData;
> +
> +typedef struct VirtIOCCWDeviceClass {
> +    DeviceClass qdev;
> +    int (*init)(VirtioCcwData *dev);
> +    int (*exit)(VirtioCcwData *dev);
> +} VirtIOCCWDeviceClass;
> +
> +struct VirtioCcwData {
> +    DeviceState qdev;
> +    SubchDev *sch;
> +    VirtIODevice *vdev;
> +    char *bus_id;
> +    VirtIOBlkConf blk;
> +    NICConf nic;
> +    uint32_t host_features;
> +    virtio_serial_conf serial;
> +    virtio_net_conf net;
> +    VirtIOSCSIConf scsi;
> +    /* Guest provided values: */
> +    target_phys_addr_t indicators;
> +};
> +
> +/* virtio-ccw bus type */
> +typedef struct VirtioCcwBus {
> +    BusState bus;
> +    VirtioCcwData *console;
> +} VirtioCcwBus;
> +
> +VirtioCcwBus *virtio_ccw_bus_init(void);
> +void virtio_ccw_device_update_status(SubchDev *sch);
> +VirtioCcwData *virtio_ccw_bus_console(VirtioCcwBus *bus);
> +VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch);
> +void virtio_ccw_reset_subchannels(struct VirtioCcwBus *bus);
> diff --git a/vl.c b/vl.c
> index e71cb30..8d1f7f0 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -284,6 +284,7 @@ static struct {
>      { .driver = "scsi-cd",              .flag = &default_cdrom     },
>      { .driver = "virtio-serial-pci",    .flag = &default_virtcon   },
>      { .driver = "virtio-serial-s390",   .flag = &default_virtcon   },
> +    { .driver = "virtio-serial-ccw",    .flag = &default_virtcon   },
>      { .driver = "virtio-serial",        .flag = &default_virtcon   },
>      { .driver = "VGA",                  .flag = &default_vga       },
>      { .driver = "isa-vga",              .flag = &default_vga       },
> --
> 1.7.11.4
>
>
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