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Re: [libvirt] [Qemu-devel] [QEMU PATCH] hw/misc/ivshmem: Remove deprecated "ivshmem" legacy device



Thomas Huth <thuth redhat com> writes:

> It's been marked as deprecated in QEMU v2.6.0 already, so really nobody
> should use the legacy "ivshmem" device anymore (but use ivshmem-plain or
> ivshmem-doorbell instead). Time to remove the deprecated device now.
>
> Signed-off-by: Thomas Huth <thuth redhat com>
> ---
>  docs/specs/ivshmem-spec.txt |   8 +-
>  hw/i386/pc_piix.c           |   4 -
>  hw/misc/ivshmem.c           | 206 +-------------------------------------------
>  qemu-deprecated.texi        |   5 --
>  scripts/device-crash-test   |   1 -
>  tests/ivshmem-test.c        |  65 +++++---------
>  6 files changed, 29 insertions(+), 260 deletions(-)
>
> diff --git a/docs/specs/ivshmem-spec.txt b/docs/specs/ivshmem-spec.txt
> index a1f5499..042f7ea 100644
> --- a/docs/specs/ivshmem-spec.txt
> +++ b/docs/specs/ivshmem-spec.txt
> @@ -17,12 +17,16 @@ get interrupted by its peers.
>  
>  There are two basic configurations:
>  
> -- Just shared memory: -device ivshmem-plain,memdev=HMB,...
> +- Just shared memory:
> +
> +      -device ivshmem-plain,memdev=HMB,...
>  
>    This uses host memory backend HMB.  It should have option "share"
>    set.
>  
> -- Shared memory plus interrupts: -device ivshmem,chardev=CHR,vectors=N,...
> +- Shared memory plus interrupts:
> +
> +      -device ivshmem-doorbell,chardev=CHR,vectors=N,...
>  
>    An ivshmem server must already be running on the host.  The device
>    connects to the server's UNIX domain socket via character device

Just whitespace.  Intentional?

> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index 7653fbb..5cbe976 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -725,10 +725,6 @@ DEFINE_I440FX_MACHINE(v1_3, "pc-1.3", pc_compat_1_3,
>              .property = "msix",\
>              .value    = "off",\
>          },{\
> -            .driver   = "ivshmem",\
> -            .property = "use64",\
> -            .value    = "0",\
> -        },{\
>              .driver   = "qxl",\
>              .property = "revision",\
>              .value    = stringify(3),\
> diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
> index 8213659..2ab741f 100644
> --- a/hw/misc/ivshmem.c
> +++ b/hw/misc/ivshmem.c
> @@ -112,13 +112,6 @@ typedef struct IVShmemState {
>      /* migration stuff */
>      OnOffAuto master;
>      Error *migration_blocker;
> -
> -    /* legacy cruft */
> -    char *role;
> -    char *shmobj;
> -    char *sizearg;
> -    size_t legacy_size;
> -    uint32_t not_legacy_32bit;
>  } IVShmemState;
>  
>  /* registers for the Inter-VM shared memory device */
> @@ -529,17 +522,6 @@ static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
>  
>      size = buf.st_size;
>  
> -    /* Legacy cruft */
> -    if (s->legacy_size != SIZE_MAX) {
> -        if (size < s->legacy_size) {
> -            error_setg(errp, "server sent only %zd bytes of shared memory",
> -                       (size_t)buf.st_size);
> -            close(fd);
> -            return;
> -        }
> -        size = s->legacy_size;
> -    }
> -
>      /* mmap the region and map into the BAR2 */
>      memory_region_init_ram_from_fd(&s->server_bar2, OBJECT(s),
>                                     "ivshmem.bar2", size, true, fd, &local_err);
> @@ -882,8 +864,8 @@ static void ivshmem_common_realize(PCIDevice *dev, Error **errp)
>      IVShmemState *s = IVSHMEM_COMMON(dev);
>      Error *err = NULL;
>      uint8_t *pci_conf;
> -    uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
> -        PCI_BASE_ADDRESS_MEM_PREFETCH;
> +    const uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
> +        PCI_BASE_ADDRESS_MEM_PREFETCH | PCI_BASE_ADDRESS_MEM_TYPE_64;
>      Error *local_err = NULL;
>  
>      /* IRQFD requires MSI */

Sure this belongs to this patch?

> @@ -903,10 +885,6 @@ static void ivshmem_common_realize(PCIDevice *dev, Error **errp)
>      pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
>                       &s->ivshmem_mmio);
>  
> -    if (s->not_legacy_32bit) {
> -        attr |= PCI_BASE_ADDRESS_MEM_TYPE_64;
> -    }
> -
>      if (s->hostmem != NULL) {
>          IVSHMEM_DPRINTF("using hostmem\n");
>  
> @@ -1084,13 +1062,6 @@ static Property ivshmem_plain_properties[] = {
>      DEFINE_PROP_END_OF_LIST(),
>  };
>  
> -static void ivshmem_plain_init(Object *obj)
> -{
> -    IVShmemState *s = IVSHMEM_PLAIN(obj);
> -
> -    s->not_legacy_32bit = 1;
> -}
> -
>  static void ivshmem_plain_realize(PCIDevice *dev, Error **errp)
>  {
>      IVShmemState *s = IVSHMEM_COMMON(dev);
> @@ -1122,7 +1093,6 @@ static const TypeInfo ivshmem_plain_info = {
>      .name          = TYPE_IVSHMEM_PLAIN,
>      .parent        = TYPE_IVSHMEM_COMMON,
>      .instance_size = sizeof(IVShmemState),
> -    .instance_init = ivshmem_plain_init,
>      .class_init    = ivshmem_plain_class_init,
>  };
>  
> @@ -1155,8 +1125,6 @@ static void ivshmem_doorbell_init(Object *obj)
>      IVShmemState *s = IVSHMEM_DOORBELL(obj);
>  
>      s->features |= (1 << IVSHMEM_MSI);
> -    s->legacy_size = SIZE_MAX;  /* whatever the server sends */
> -    s->not_legacy_32bit = 1;
>  }
>  
>  static void ivshmem_doorbell_realize(PCIDevice *dev, Error **errp)
> @@ -1189,181 +1157,11 @@ static const TypeInfo ivshmem_doorbell_info = {
>      .class_init    = ivshmem_doorbell_class_init,
>  };
>  
> -static int ivshmem_load_old(QEMUFile *f, void *opaque, int version_id)
> -{
> -    IVShmemState *s = opaque;
> -    PCIDevice *pdev = PCI_DEVICE(s);
> -    int ret;
> -
> -    IVSHMEM_DPRINTF("ivshmem_load_old\n");
> -
> -    if (version_id != 0) {
> -        return -EINVAL;
> -    }
> -
> -    ret = ivshmem_pre_load(s);
> -    if (ret) {
> -        return ret;
> -    }
> -
> -    ret = pci_device_load(pdev, f);
> -    if (ret) {
> -        return ret;
> -    }
> -
> -    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
> -        msix_load(pdev, f);
> -        ivshmem_msix_vector_use(s);
> -    } else {
> -        s->intrstatus = qemu_get_be32(f);
> -        s->intrmask = qemu_get_be32(f);
> -    }
> -
> -    return 0;
> -}
> -
> -static bool test_msix(void *opaque, int version_id)
> -{
> -    IVShmemState *s = opaque;
> -
> -    return ivshmem_has_feature(s, IVSHMEM_MSI);
> -}
> -
> -static bool test_no_msix(void *opaque, int version_id)
> -{
> -    return !test_msix(opaque, version_id);
> -}
> -
> -static const VMStateDescription ivshmem_vmsd = {
> -    .name = "ivshmem",
> -    .version_id = 1,
> -    .minimum_version_id = 1,
> -    .pre_load = ivshmem_pre_load,
> -    .post_load = ivshmem_post_load,
> -    .fields = (VMStateField[]) {
> -        VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
> -
> -        VMSTATE_MSIX_TEST(parent_obj, IVShmemState, test_msix),
> -        VMSTATE_UINT32_TEST(intrstatus, IVShmemState, test_no_msix),
> -        VMSTATE_UINT32_TEST(intrmask, IVShmemState, test_no_msix),
> -
> -        VMSTATE_END_OF_LIST()
> -    },
> -    .load_state_old = ivshmem_load_old,
> -    .minimum_version_id_old = 0
> -};
> -
> -static Property ivshmem_properties[] = {
> -    DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
> -    DEFINE_PROP_STRING("size", IVShmemState, sizearg),
> -    DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
> -    DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD,
> -                    false),
> -    DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
> -    DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
> -    DEFINE_PROP_STRING("role", IVShmemState, role),
> -    DEFINE_PROP_UINT32("use64", IVShmemState, not_legacy_32bit, 1),
> -    DEFINE_PROP_END_OF_LIST(),
> -};
> -
> -static void desugar_shm(IVShmemState *s)
> -{
> -    Object *obj;
> -    char *path;
> -
> -    obj = object_new("memory-backend-file");
> -    path = g_strdup_printf("/dev/shm/%s", s->shmobj);
> -    object_property_set_str(obj, path, "mem-path", &error_abort);
> -    g_free(path);
> -    object_property_set_int(obj, s->legacy_size, "size", &error_abort);
> -    object_property_set_bool(obj, true, "share", &error_abort);
> -    object_property_add_child(OBJECT(s), "internal-shm-backend", obj,
> -                              &error_abort);
> -    object_unref(obj);
> -    user_creatable_complete(USER_CREATABLE(obj), &error_abort);
> -    s->hostmem = MEMORY_BACKEND(obj);
> -}
> -
> -static void ivshmem_realize(PCIDevice *dev, Error **errp)
> -{
> -    IVShmemState *s = IVSHMEM_COMMON(dev);
> -
> -    if (!qtest_enabled()) {
> -        warn_report("ivshmem is deprecated, please use ivshmem-plain"
> -                    " or ivshmem-doorbell instead");
> -    }
> -
> -    if (qemu_chr_fe_backend_connected(&s->server_chr) + !!s->shmobj != 1) {
> -        error_setg(errp, "You must specify either 'shm' or 'chardev'");
> -        return;
> -    }
> -
> -    if (s->sizearg == NULL) {
> -        s->legacy_size = 4 * MiB; /* 4 MB default */
> -    } else {
> -        int ret;
> -        uint64_t size;
> -
> -        ret = qemu_strtosz_MiB(s->sizearg, NULL, &size);
> -        if (ret < 0 || (size_t)size != size || !is_power_of_2(size)) {
> -            error_setg(errp, "Invalid size %s", s->sizearg);
> -            return;
> -        }
> -        s->legacy_size = size;
> -    }
> -
> -    /* check that role is reasonable */
> -    if (s->role) {
> -        if (strncmp(s->role, "peer", 5) == 0) {
> -            s->master = ON_OFF_AUTO_OFF;
> -        } else if (strncmp(s->role, "master", 7) == 0) {
> -            s->master = ON_OFF_AUTO_ON;
> -        } else {
> -            error_setg(errp, "'role' must be 'peer' or 'master'");
> -            return;
> -        }
> -    } else {
> -        s->master = ON_OFF_AUTO_AUTO;
> -    }
> -
> -    if (s->shmobj) {
> -        desugar_shm(s);
> -    }
> -
> -    /*
> -     * Note: we don't use INTx with IVSHMEM_MSI at all, so this is a
> -     * bald-faced lie then.  But it's a backwards compatible lie.
> -     */
> -    pci_config_set_interrupt_pin(dev->config, 1);
> -
> -    ivshmem_common_realize(dev, errp);
> -}
> -
> -static void ivshmem_class_init(ObjectClass *klass, void *data)
> -{
> -    DeviceClass *dc = DEVICE_CLASS(klass);
> -    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
> -
> -    k->realize = ivshmem_realize;
> -    k->revision = 0;
> -    dc->desc = "Inter-VM shared memory (legacy)";
> -    dc->props = ivshmem_properties;
> -    dc->vmsd = &ivshmem_vmsd;
> -}
> -
> -static const TypeInfo ivshmem_info = {
> -    .name          = TYPE_IVSHMEM,
> -    .parent        = TYPE_IVSHMEM_COMMON,
> -    .instance_size = sizeof(IVShmemState),
> -    .class_init    = ivshmem_class_init,
> -};
> -
>  static void ivshmem_register_types(void)
>  {
>      type_register_static(&ivshmem_common_info);
>      type_register_static(&ivshmem_plain_info);
>      type_register_static(&ivshmem_doorbell_info);
> -    type_register_static(&ivshmem_info);
>  }
>  
>  type_init(ivshmem_register_types)
> diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
> index 190250f..038df3d 100644
> --- a/qemu-deprecated.texi
> +++ b/qemu-deprecated.texi
> @@ -110,11 +110,6 @@ documentation of ``query-hotpluggable-cpus'' for additional details.
>  
>  @section System emulator devices
>  
> - subsection ivshmem (since 2.6.0)
> -
> -The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
> -or ``ivshmem-doorbell`` device types.
> -
>  @subsection bluetooth (since 3.1)
>  
>  The bluetooth subsystem is unmaintained since many years and likely bitrotten
> diff --git a/scripts/device-crash-test b/scripts/device-crash-test
> index e93a7c0..a835772 100755
> --- a/scripts/device-crash-test
> +++ b/scripts/device-crash-test
> @@ -83,7 +83,6 @@ ERROR_WHITELIST = [
>      {'device':'isa-ipmi-bt', 'expected':True},             # IPMI device requires a bmc attribute to be set
>      {'device':'isa-ipmi-kcs', 'expected':True},            # IPMI device requires a bmc attribute to be set
>      {'device':'isa-parallel', 'expected':True},            # Can't create serial device, empty char device
> -    {'device':'ivshmem', 'expected':True},                 # You must specify either 'shm' or 'chardev'
>      {'device':'ivshmem-doorbell', 'expected':True},        # You must specify a 'chardev'
>      {'device':'ivshmem-plain', 'expected':True},           # You must specify a 'memdev'
>      {'device':'loader', 'expected':True},                  # please include valid arguments
> diff --git a/tests/ivshmem-test.c b/tests/ivshmem-test.c
> index c37b196..9811d66 100644
> --- a/tests/ivshmem-test.c
> +++ b/tests/ivshmem-test.c
> @@ -305,20 +305,18 @@ static void *server_thread(void *data)
>      return NULL;
>  }
>  
> -static void setup_vm_with_server(IVState *s, int nvectors, bool msi)
> +static void setup_vm_with_server(IVState *s, int nvectors)
>  {
> -    char *cmd = g_strdup_printf("-chardev socket,id=chr0,path=%s,nowait "
> -                                "-device ivshmem%s,chardev=chr0,vectors=%d",
> -                                tmpserver,
> -                                msi ? "-doorbell" : ",size=1M,msi=off",
> -                                nvectors);
> +    char *cmd = g_strdup_printf("-chardev socket,id=chr0,path=%s,nowait -device"

Awkward line break.

> +                                " ivshmem-doorbell,chardev=chr0,vectors=%d",
> +                                tmpserver, nvectors);

Suggest

       char *cmd = g_strdup_printf("-chardev socket,id=chr0,path=%s,nowait "
                       "-device ivshmem-doorbell,chardev=chr0,vectors=%d",
                       tmpserver, nvectors);

>  
> -    setup_vm_cmd(s, cmd, msi);
> +    setup_vm_cmd(s, cmd, true);
>  
>      g_free(cmd);
>  }
>  
> -static void test_ivshmem_server(bool msi)
> +static void test_ivshmem_server(void)
>  {
>      IVState state1, state2, *s1, *s2;
>      ServerThread thread;
> @@ -341,9 +339,9 @@ static void test_ivshmem_server(bool msi)
>      thread.thread = g_thread_new("ivshmem-server", server_thread, &thread);
>      g_assert(thread.thread != NULL);
>  
> -    setup_vm_with_server(&state1, nvectors, msi);
> +    setup_vm_with_server(&state1, nvectors);
>      s1 = &state1;
> -    setup_vm_with_server(&state2, nvectors, msi);
> +    setup_vm_with_server(&state2, nvectors);
>      s2 = &state2;
>  
>      /* check got different VM ids */
> @@ -355,39 +353,29 @@ static void test_ivshmem_server(bool msi)
>  
>      /* check number of MSI-X vectors */
>      global_qtest = s1->qs->qts;
> -    if (msi) {
> -        ret = qpci_msix_table_size(s1->dev);
> -        g_assert_cmpuint(ret, ==, nvectors);
> -    }
> +    ret = qpci_msix_table_size(s1->dev);
> +    g_assert_cmpuint(ret, ==, nvectors);
>  
>      /* TODO test behavior before MSI-X is enabled */
>  
>      /* ping vm2 -> vm1 on vector 0 */
> -    if (msi) {
> -        ret = qpci_msix_pending(s1->dev, 0);
> -        g_assert_cmpuint(ret, ==, 0);
> -    } else {
> -        g_assert_cmpuint(in_reg(s1, INTRSTATUS), ==, 0);
> -    }
> +    ret = qpci_msix_pending(s1->dev, 0);
> +    g_assert_cmpuint(ret, ==, 0);
>      out_reg(s2, DOORBELL, vm1 << 16);
>      do {
>          g_usleep(10000);
> -        ret = msi ? qpci_msix_pending(s1->dev, 0) : in_reg(s1, INTRSTATUS);
> +        ret = qpci_msix_pending(s1->dev, 0);
>      } while (ret == 0 && g_get_monotonic_time() < end_time);
>      g_assert_cmpuint(ret, !=, 0);
>  
>      /* ping vm1 -> vm2 on vector 1 */
>      global_qtest = s2->qs->qts;
> -    if (msi) {
> -        ret = qpci_msix_pending(s2->dev, 1);
> -        g_assert_cmpuint(ret, ==, 0);
> -    } else {
> -        g_assert_cmpuint(in_reg(s2, INTRSTATUS), ==, 0);
> -    }
> +    ret = qpci_msix_pending(s2->dev, 1);
> +    g_assert_cmpuint(ret, ==, 0);
>      out_reg(s1, DOORBELL, vm2 << 16 | 1);
>      do {
>          g_usleep(10000);
> -        ret = msi ? qpci_msix_pending(s2->dev, 1) : in_reg(s2, INTRSTATUS);
> +        ret = qpci_msix_pending(s2->dev, 1);
>      } while (ret == 0 && g_get_monotonic_time() < end_time);
>      g_assert_cmpuint(ret, !=, 0);
>  
> @@ -405,27 +393,17 @@ static void test_ivshmem_server(bool msi)
>      close(thread.pipe[0]);
>  }
>  
> -static void test_ivshmem_server_msi(void)
> -{
> -    test_ivshmem_server(true);
> -}
> -
> -static void test_ivshmem_server_irq(void)
> -{
> -    test_ivshmem_server(false);
> -}
> -
>  #define PCI_SLOT_HP             0x06
>  
>  static void test_ivshmem_hotplug(void)
>  {
>      const char *arch = qtest_get_arch();
>  
> -    qtest_start("");
> +    qtest_start("-object memory-backend-ram,size=1M,id=mb1");
>  
> -    qtest_qmp_device_add("ivshmem",
> -                         "iv1", "{'addr': %s, 'shm': %s, 'size': '1M'}",
> -                         stringify(PCI_SLOT_HP), tmpshm);
> +    qtest_qmp_device_add("ivshmem-plain", "iv1",
> +                         "{'addr': %s, 'memdev': 'mb1'}",
> +                         stringify(PCI_SLOT_HP));
>      if (strcmp(arch, "ppc64") != 0) {
>          qpci_unplug_acpi_device_test("iv1", PCI_SLOT_HP);
>      }
> @@ -525,8 +503,7 @@ int main(int argc, char **argv)
>      if (g_test_slow()) {
>          qtest_add_func("/ivshmem/pair", test_ivshmem_pair);
>          if (strcmp(arch, "ppc64") != 0) {
> -            qtest_add_func("/ivshmem/server-msi", test_ivshmem_server_msi);
> -            qtest_add_func("/ivshmem/server-irq", test_ivshmem_server_irq);
> +            qtest_add_func("/ivshmem/server", test_ivshmem_server);
>          }
>      }


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