diff options
Diffstat (limited to 'hw/s390x/virtio-ccw.c')
| -rw-r--r-- | hw/s390x/virtio-ccw.c | 1302 |
1 files changed, 1302 insertions, 0 deletions
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c new file mode 100644 index 000000000..c845a92c3 --- /dev/null +++ b/hw/s390x/virtio-ccw.c @@ -0,0 +1,1302 @@ +/* + * virtio ccw target implementation + * + * Copyright 2012,2015 IBM Corp. + * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> + * Pierre Morel <pmorel@linux.vnet.ibm.com> + * + * 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 "qemu/osdep.h" +#include "qapi/error.h" +#include "sysemu/kvm.h" +#include "net/net.h" +#include "hw/virtio/virtio.h" +#include "migration/qemu-file-types.h" +#include "hw/virtio/virtio-net.h" +#include "qemu/bitops.h" +#include "qemu/error-report.h" +#include "qemu/module.h" +#include "hw/virtio/virtio-access.h" +#include "hw/virtio/virtio-bus.h" +#include "hw/s390x/adapter.h" +#include "hw/s390x/s390_flic.h" + +#include "hw/s390x/ioinst.h" +#include "hw/s390x/css.h" +#include "virtio-ccw.h" +#include "trace.h" +#include "hw/s390x/css-bridge.h" +#include "hw/s390x/s390-virtio-ccw.h" +#include "sysemu/replay.h" + +#define NR_CLASSIC_INDICATOR_BITS 64 + +bool have_virtio_ccw = true; + +static int virtio_ccw_dev_post_load(void *opaque, int version_id) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque); + CcwDevice *ccw_dev = CCW_DEVICE(dev); + CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); + + ccw_dev->sch->driver_data = dev; + if (ccw_dev->sch->thinint_active) { + dev->routes.adapter.adapter_id = css_get_adapter_id( + CSS_IO_ADAPTER_VIRTIO, + dev->thinint_isc); + } + /* Re-fill subch_id after loading the subchannel states.*/ + if (ck->refill_ids) { + ck->refill_ids(ccw_dev); + } + return 0; +} + +typedef struct VirtioCcwDeviceTmp { + VirtioCcwDevice *parent; + uint16_t config_vector; +} VirtioCcwDeviceTmp; + +static int virtio_ccw_dev_tmp_pre_save(void *opaque) +{ + VirtioCcwDeviceTmp *tmp = opaque; + VirtioCcwDevice *dev = tmp->parent; + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + + tmp->config_vector = vdev->config_vector; + + return 0; +} + +static int virtio_ccw_dev_tmp_post_load(void *opaque, int version_id) +{ + VirtioCcwDeviceTmp *tmp = opaque; + VirtioCcwDevice *dev = tmp->parent; + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + + vdev->config_vector = tmp->config_vector; + return 0; +} + +const VMStateDescription vmstate_virtio_ccw_dev_tmp = { + .name = "s390_virtio_ccw_dev_tmp", + .pre_save = virtio_ccw_dev_tmp_pre_save, + .post_load = virtio_ccw_dev_tmp_post_load, + .fields = (VMStateField[]) { + VMSTATE_UINT16(config_vector, VirtioCcwDeviceTmp), + VMSTATE_END_OF_LIST() + } +}; + +const VMStateDescription vmstate_virtio_ccw_dev = { + .name = "s390_virtio_ccw_dev", + .version_id = 1, + .minimum_version_id = 1, + .post_load = virtio_ccw_dev_post_load, + .fields = (VMStateField[]) { + VMSTATE_CCW_DEVICE(parent_obj, VirtioCcwDevice), + VMSTATE_PTR_TO_IND_ADDR(indicators, VirtioCcwDevice), + VMSTATE_PTR_TO_IND_ADDR(indicators2, VirtioCcwDevice), + VMSTATE_PTR_TO_IND_ADDR(summary_indicator, VirtioCcwDevice), + /* + * Ugly hack because VirtIODevice does not migrate itself. + * This also makes legacy via vmstate_save_state possible. + */ + VMSTATE_WITH_TMP(VirtioCcwDevice, VirtioCcwDeviceTmp, + vmstate_virtio_ccw_dev_tmp), + VMSTATE_STRUCT(routes, VirtioCcwDevice, 1, vmstate_adapter_routes, + AdapterRoutes), + VMSTATE_UINT8(thinint_isc, VirtioCcwDevice), + VMSTATE_INT32(revision, VirtioCcwDevice), + VMSTATE_END_OF_LIST() + } +}; + +static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, + VirtioCcwDevice *dev); + +VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch) +{ + VirtIODevice *vdev = NULL; + VirtioCcwDevice *dev = sch->driver_data; + + if (dev) { + vdev = virtio_bus_get_device(&dev->bus); + } + return vdev; +} + +static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev) +{ + virtio_bus_start_ioeventfd(&dev->bus); +} + +static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev) +{ + virtio_bus_stop_ioeventfd(&dev->bus); +} + +static bool virtio_ccw_ioeventfd_enabled(DeviceState *d) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + + return (dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) != 0; +} + +static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, + int n, bool assign) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + CcwDevice *ccw_dev = CCW_DEVICE(dev); + SubchDev *sch = ccw_dev->sch; + uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid; + + return s390_assign_subch_ioeventfd(notifier, sch_id, n, assign); +} + +/* Communication blocks used by several channel commands. */ +typedef struct VqInfoBlockLegacy { + uint64_t queue; + uint32_t align; + uint16_t index; + uint16_t num; +} QEMU_PACKED VqInfoBlockLegacy; + +typedef struct VqInfoBlock { + uint64_t desc; + uint32_t res0; + uint16_t index; + uint16_t num; + uint64_t avail; + uint64_t used; +} QEMU_PACKED VqInfoBlock; + +typedef struct VqConfigBlock { + uint16_t index; + uint16_t num_max; +} QEMU_PACKED VqConfigBlock; + +typedef struct VirtioFeatDesc { + uint32_t features; + uint8_t index; +} QEMU_PACKED VirtioFeatDesc; + +typedef struct VirtioThinintInfo { + hwaddr summary_indicator; + hwaddr device_indicator; + uint64_t ind_bit; + uint8_t isc; +} QEMU_PACKED VirtioThinintInfo; + +typedef struct VirtioRevInfo { + uint16_t revision; + uint16_t length; + uint8_t data[]; +} QEMU_PACKED VirtioRevInfo; + +/* Specify where the virtqueues for the subchannel are in guest memory. */ +static int virtio_ccw_set_vqs(SubchDev *sch, VqInfoBlock *info, + VqInfoBlockLegacy *linfo) +{ + VirtIODevice *vdev = virtio_ccw_get_vdev(sch); + uint16_t index = info ? info->index : linfo->index; + uint16_t num = info ? info->num : linfo->num; + uint64_t desc = info ? info->desc : linfo->queue; + + if (index >= VIRTIO_QUEUE_MAX) { + return -EINVAL; + } + + /* Current code in virtio.c relies on 4K alignment. */ + if (linfo && desc && (linfo->align != 4096)) { + return -EINVAL; + } + + if (!vdev) { + return -EINVAL; + } + + if (info) { + virtio_queue_set_rings(vdev, index, desc, info->avail, info->used); + } else { + virtio_queue_set_addr(vdev, index, desc); + } + if (!desc) { + virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR); + } else { + if (info) { + /* virtio-1 allows changing the ring size. */ + if (virtio_queue_get_max_num(vdev, index) < num) { + /* Fail if we exceed the maximum number. */ + return -EINVAL; + } + virtio_queue_set_num(vdev, index, num); + } else if (virtio_queue_get_num(vdev, index) > num) { + /* Fail if we don't have a big enough queue. */ + return -EINVAL; + } + /* We ignore possible increased num for legacy for compatibility. */ + virtio_queue_set_vector(vdev, index, index); + } + /* tell notify handler in case of config change */ + vdev->config_vector = VIRTIO_QUEUE_MAX; + return 0; +} + +static void virtio_ccw_reset_virtio(VirtioCcwDevice *dev, VirtIODevice *vdev) +{ + CcwDevice *ccw_dev = CCW_DEVICE(dev); + + virtio_ccw_stop_ioeventfd(dev); + virtio_reset(vdev); + if (dev->indicators) { + release_indicator(&dev->routes.adapter, dev->indicators); + dev->indicators = NULL; + } + if (dev->indicators2) { + release_indicator(&dev->routes.adapter, dev->indicators2); + dev->indicators2 = NULL; + } + if (dev->summary_indicator) { + release_indicator(&dev->routes.adapter, dev->summary_indicator); + dev->summary_indicator = NULL; + } + ccw_dev->sch->thinint_active = false; +} + +static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len, + bool is_legacy) +{ + int ret; + VqInfoBlock info; + VqInfoBlockLegacy linfo; + size_t info_len = is_legacy ? sizeof(linfo) : sizeof(info); + + if (check_len) { + if (ccw.count != info_len) { + return -EINVAL; + } + } else if (ccw.count < info_len) { + /* Can't execute command. */ + return -EINVAL; + } + if (!ccw.cda) { + return -EFAULT; + } + if (is_legacy) { + ret = ccw_dstream_read(&sch->cds, linfo); + if (ret) { + return ret; + } + linfo.queue = be64_to_cpu(linfo.queue); + linfo.align = be32_to_cpu(linfo.align); + linfo.index = be16_to_cpu(linfo.index); + linfo.num = be16_to_cpu(linfo.num); + ret = virtio_ccw_set_vqs(sch, NULL, &linfo); + } else { + ret = ccw_dstream_read(&sch->cds, info); + if (ret) { + return ret; + } + info.desc = be64_to_cpu(info.desc); + info.index = be16_to_cpu(info.index); + info.num = be16_to_cpu(info.num); + info.avail = be64_to_cpu(info.avail); + info.used = be64_to_cpu(info.used); + ret = virtio_ccw_set_vqs(sch, &info, NULL); + } + sch->curr_status.scsw.count = 0; + return ret; +} + +static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) +{ + int ret; + VirtioRevInfo revinfo; + uint8_t status; + VirtioFeatDesc features; + hwaddr indicators; + VqConfigBlock vq_config; + VirtioCcwDevice *dev = sch->driver_data; + VirtIODevice *vdev = virtio_ccw_get_vdev(sch); + bool check_len; + int len; + VirtioThinintInfo thinint; + + if (!dev) { + return -EINVAL; + } + + trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid, + ccw.cmd_code); + check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); + + if (dev->revision < 0 && ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { + if (dev->force_revision_1) { + /* + * virtio-1 drivers must start with negotiating to a revision >= 1, + * so post a command reject for all other commands + */ + return -ENOSYS; + } else { + /* + * If the driver issues any command that is not SET_VIRTIO_REV, + * we'll have to operate the device in legacy mode. + */ + dev->revision = 0; + } + } + + /* Look at the command. */ + switch (ccw.cmd_code) { + case CCW_CMD_SET_VQ: + ret = virtio_ccw_handle_set_vq(sch, ccw, check_len, dev->revision < 1); + break; + case CCW_CMD_VDEV_RESET: + virtio_ccw_reset_virtio(dev, vdev); + ret = 0; + break; + case CCW_CMD_READ_FEAT: + if (check_len) { + if (ccw.count != sizeof(features)) { + ret = -EINVAL; + break; + } + } else if (ccw.count < sizeof(features)) { + /* Can't execute command. */ + ret = -EINVAL; + break; + } + if (!ccw.cda) { + ret = -EFAULT; + } else { + VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); + + ccw_dstream_advance(&sch->cds, sizeof(features.features)); + ret = ccw_dstream_read(&sch->cds, features.index); + if (ret) { + break; + } + if (features.index == 0) { + if (dev->revision >= 1) { + /* Don't offer legacy features for modern devices. */ + features.features = (uint32_t) + (vdev->host_features & ~vdc->legacy_features); + } else { + features.features = (uint32_t)vdev->host_features; + } + } else if ((features.index == 1) && (dev->revision >= 1)) { + /* + * Only offer feature bits beyond 31 if the guest has + * negotiated at least revision 1. + */ + features.features = (uint32_t)(vdev->host_features >> 32); + } else { + /* Return zeroes if the guest supports more feature bits. */ + features.features = 0; + } + ccw_dstream_rewind(&sch->cds); + features.features = cpu_to_le32(features.features); + ret = ccw_dstream_write(&sch->cds, features.features); + if (!ret) { + sch->curr_status.scsw.count = ccw.count - sizeof(features); + } + } + break; + case CCW_CMD_WRITE_FEAT: + if (check_len) { + if (ccw.count != sizeof(features)) { + ret = -EINVAL; + break; + } + } else if (ccw.count < sizeof(features)) { + /* Can't execute command. */ + ret = -EINVAL; + break; + } + if (!ccw.cda) { + ret = -EFAULT; + } else { + ret = ccw_dstream_read(&sch->cds, features); + if (ret) { + break; + } + features.features = le32_to_cpu(features.features); + if (features.index == 0) { + virtio_set_features(vdev, + (vdev->guest_features & 0xffffffff00000000ULL) | + features.features); + } else if ((features.index == 1) && (dev->revision >= 1)) { + /* + * If the guest did not negotiate at least revision 1, + * we did not offer it any feature bits beyond 31. Such a + * guest passing us any bit here is therefore buggy. + */ + virtio_set_features(vdev, + (vdev->guest_features & 0x00000000ffffffffULL) | + ((uint64_t)features.features << 32)); + } else { + /* + * If the guest supports more feature bits, assert that it + * passes us zeroes for those we don't support. + */ + if (features.features) { + qemu_log_mask(LOG_GUEST_ERROR, + "Guest bug: features[%i]=%x (expected 0)", + features.index, features.features); + /* XXX: do a unit check here? */ + } + } + sch->curr_status.scsw.count = ccw.count - sizeof(features); + ret = 0; + } + break; + case CCW_CMD_READ_CONF: + if (check_len) { + if (ccw.count > vdev->config_len) { + ret = -EINVAL; + break; + } + } + len = MIN(ccw.count, vdev->config_len); + if (!ccw.cda) { + ret = -EFAULT; + } else { + virtio_bus_get_vdev_config(&dev->bus, vdev->config); + ret = ccw_dstream_write_buf(&sch->cds, vdev->config, len); + if (ret) { + sch->curr_status.scsw.count = ccw.count - len; + } + } + break; + case CCW_CMD_WRITE_CONF: + if (check_len) { + if (ccw.count > vdev->config_len) { + ret = -EINVAL; + break; + } + } + len = MIN(ccw.count, vdev->config_len); + if (!ccw.cda) { + ret = -EFAULT; + } else { + ret = ccw_dstream_read_buf(&sch->cds, vdev->config, len); + if (!ret) { + virtio_bus_set_vdev_config(&dev->bus, vdev->config); + sch->curr_status.scsw.count = ccw.count - len; + } + } + break; + case CCW_CMD_READ_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 (!ccw.cda) { + ret = -EFAULT; + } else { + address_space_stb(&address_space_memory, ccw.cda, vdev->status, + MEMTXATTRS_UNSPECIFIED, NULL); + sch->curr_status.scsw.count = ccw.count - sizeof(vdev->status); + 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 (!ccw.cda) { + ret = -EFAULT; + } else { + ret = ccw_dstream_read(&sch->cds, status); + if (ret) { + break; + } + if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { + virtio_ccw_stop_ioeventfd(dev); + } + if (virtio_set_status(vdev, status) == 0) { + if (vdev->status == 0) { + virtio_ccw_reset_virtio(dev, vdev); + } + if (status & VIRTIO_CONFIG_S_DRIVER_OK) { + virtio_ccw_start_ioeventfd(dev); + } + sch->curr_status.scsw.count = ccw.count - sizeof(status); + ret = 0; + } else { + /* Trigger a command reject. */ + ret = -ENOSYS; + } + } + 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; + } + if (sch->thinint_active) { + /* Trigger a command reject. */ + ret = -ENOSYS; + break; + } + if (virtio_get_num_queues(vdev) > NR_CLASSIC_INDICATOR_BITS) { + /* More queues than indicator bits --> trigger a reject */ + ret = -ENOSYS; + break; + } + if (!ccw.cda) { + ret = -EFAULT; + } else { + ret = ccw_dstream_read(&sch->cds, indicators); + if (ret) { + break; + } + indicators = be64_to_cpu(indicators); + dev->indicators = get_indicator(indicators, sizeof(uint64_t)); + sch->curr_status.scsw.count = ccw.count - sizeof(indicators); + ret = 0; + } + break; + case CCW_CMD_SET_CONF_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; + } + if (!ccw.cda) { + ret = -EFAULT; + } else { + ret = ccw_dstream_read(&sch->cds, indicators); + if (ret) { + break; + } + indicators = be64_to_cpu(indicators); + dev->indicators2 = get_indicator(indicators, sizeof(uint64_t)); + 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 (!ccw.cda) { + ret = -EFAULT; + } else { + ret = ccw_dstream_read(&sch->cds, vq_config.index); + if (ret) { + break; + } + vq_config.index = be16_to_cpu(vq_config.index); + if (vq_config.index >= VIRTIO_QUEUE_MAX) { + ret = -EINVAL; + break; + } + vq_config.num_max = virtio_queue_get_num(vdev, + vq_config.index); + vq_config.num_max = cpu_to_be16(vq_config.num_max); + ret = ccw_dstream_write(&sch->cds, vq_config.num_max); + if (!ret) { + sch->curr_status.scsw.count = ccw.count - sizeof(vq_config); + } + } + break; + case CCW_CMD_SET_IND_ADAPTER: + if (check_len) { + if (ccw.count != sizeof(thinint)) { + ret = -EINVAL; + break; + } + } else if (ccw.count < sizeof(thinint)) { + /* Can't execute command. */ + ret = -EINVAL; + break; + } + if (!ccw.cda) { + ret = -EFAULT; + } else if (dev->indicators && !sch->thinint_active) { + /* Trigger a command reject. */ + ret = -ENOSYS; + } else { + if (ccw_dstream_read(&sch->cds, thinint)) { + ret = -EFAULT; + } else { + thinint.ind_bit = be64_to_cpu(thinint.ind_bit); + thinint.summary_indicator = + be64_to_cpu(thinint.summary_indicator); + thinint.device_indicator = + be64_to_cpu(thinint.device_indicator); + + dev->summary_indicator = + get_indicator(thinint.summary_indicator, sizeof(uint8_t)); + dev->indicators = + get_indicator(thinint.device_indicator, + thinint.ind_bit / 8 + 1); + dev->thinint_isc = thinint.isc; + dev->routes.adapter.ind_offset = thinint.ind_bit; + dev->routes.adapter.summary_offset = 7; + dev->routes.adapter.adapter_id = css_get_adapter_id( + CSS_IO_ADAPTER_VIRTIO, + dev->thinint_isc); + sch->thinint_active = ((dev->indicators != NULL) && + (dev->summary_indicator != NULL)); + sch->curr_status.scsw.count = ccw.count - sizeof(thinint); + ret = 0; + } + } + break; + case CCW_CMD_SET_VIRTIO_REV: + len = sizeof(revinfo); + if (ccw.count < len) { + ret = -EINVAL; + break; + } + if (!ccw.cda) { + ret = -EFAULT; + break; + } + ret = ccw_dstream_read_buf(&sch->cds, &revinfo, 4); + if (ret < 0) { + break; + } + revinfo.revision = be16_to_cpu(revinfo.revision); + revinfo.length = be16_to_cpu(revinfo.length); + if (ccw.count < len + revinfo.length || + (check_len && ccw.count > len + revinfo.length)) { + ret = -EINVAL; + break; + } + /* + * Once we start to support revisions with additional data, we'll + * need to fetch it here. Nothing to do for now, though. + */ + if (dev->revision >= 0 || + revinfo.revision > virtio_ccw_rev_max(dev) || + (dev->force_revision_1 && !revinfo.revision)) { + ret = -ENOSYS; + break; + } + ret = 0; + dev->revision = revinfo.revision; + break; + default: + ret = -ENOSYS; + break; + } + return ret; +} + +static void virtio_sch_disable_cb(SubchDev *sch) +{ + VirtioCcwDevice *dev = sch->driver_data; + + dev->revision = -1; +} + +static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) +{ + VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev); + CcwDevice *ccw_dev = CCW_DEVICE(dev); + CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); + SubchDev *sch; + Error *err = NULL; + int i; + + sch = css_create_sch(ccw_dev->devno, errp); + if (!sch) { + return; + } + if (!virtio_ccw_rev_max(dev) && dev->force_revision_1) { + error_setg(&err, "Invalid value of property max_rev " + "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); + goto out_err; + } + + sch->driver_data = dev; + sch->ccw_cb = virtio_ccw_cb; + sch->disable_cb = virtio_sch_disable_cb; + sch->id.reserved = 0xff; + sch->id.cu_type = VIRTIO_CCW_CU_TYPE; + sch->do_subchannel_work = do_subchannel_work_virtual; + sch->irb_cb = build_irb_virtual; + ccw_dev->sch = sch; + dev->indicators = NULL; + dev->revision = -1; + for (i = 0; i < ADAPTER_ROUTES_MAX_GSI; i++) { + dev->routes.gsi[i] = -1; + } + css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE); + + trace_virtio_ccw_new_device( + sch->cssid, sch->ssid, sch->schid, sch->devno, + ccw_dev->devno.valid ? "user-configured" : "auto-configured"); + + if (kvm_enabled() && !kvm_eventfds_enabled()) { + dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; + } + + /* fd-based ioevents can't be synchronized in record/replay */ + if (replay_mode != REPLAY_MODE_NONE) { + dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; + } + + if (k->realize) { + k->realize(dev, &err); + if (err) { + goto out_err; + } + } + + ck->realize(ccw_dev, &err); + if (err) { + goto out_err; + } + + return; + +out_err: + error_propagate(errp, err); + css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); + ccw_dev->sch = NULL; + g_free(sch); +} + +static void virtio_ccw_device_unrealize(VirtioCcwDevice *dev) +{ + VirtIOCCWDeviceClass *dc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); + CcwDevice *ccw_dev = CCW_DEVICE(dev); + SubchDev *sch = ccw_dev->sch; + + if (dc->unrealize) { + dc->unrealize(dev); + } + + if (sch) { + css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); + g_free(sch); + ccw_dev->sch = NULL; + } + if (dev->indicators) { + release_indicator(&dev->routes.adapter, dev->indicators); + dev->indicators = NULL; + } +} + +/* DeviceState to VirtioCcwDevice. Note: used on datapath, + * be careful and test performance if you change this. + */ +static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d) +{ + CcwDevice *ccw_dev = to_ccw_dev_fast(d); + + return container_of(ccw_dev, VirtioCcwDevice, parent_obj); +} + +static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc, + uint8_t to_be_set) +{ + uint8_t expected, actual; + hwaddr len = 1; + /* avoid multiple fetches */ + uint8_t volatile *ind_addr; + + ind_addr = cpu_physical_memory_map(ind_loc, &len, true); + if (!ind_addr) { + error_report("%s(%x.%x.%04x): unable to access indicator", + __func__, sch->cssid, sch->ssid, sch->schid); + return -1; + } + actual = *ind_addr; + do { + expected = actual; + actual = qatomic_cmpxchg(ind_addr, expected, expected | to_be_set); + } while (actual != expected); + trace_virtio_ccw_set_ind(ind_loc, actual, actual | to_be_set); + cpu_physical_memory_unmap((void *)ind_addr, len, 1, len); + + return actual; +} + +static void virtio_ccw_notify(DeviceState *d, uint16_t vector) +{ + VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d); + CcwDevice *ccw_dev = to_ccw_dev_fast(d); + SubchDev *sch = ccw_dev->sch; + uint64_t indicators; + + if (vector == VIRTIO_NO_VECTOR) { + return; + } + /* + * vector < VIRTIO_QUEUE_MAX: notification for a virtqueue + * vector == VIRTIO_QUEUE_MAX: configuration change notification + * bits beyond that are unused and should never be notified for + */ + assert(vector <= VIRTIO_QUEUE_MAX); + + if (vector < VIRTIO_QUEUE_MAX) { + if (!dev->indicators) { + return; + } + if (sch->thinint_active) { + /* + * In the adapter interrupt case, indicators points to a + * memory area that may be (way) larger than 64 bit and + * ind_bit indicates the start of the indicators in a big + * endian notation. + */ + uint64_t ind_bit = dev->routes.adapter.ind_offset; + + virtio_set_ind_atomic(sch, dev->indicators->addr + + (ind_bit + vector) / 8, + 0x80 >> ((ind_bit + vector) % 8)); + if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr, + 0x01)) { + css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc); + } + } else { + assert(vector < NR_CLASSIC_INDICATOR_BITS); + indicators = address_space_ldq(&address_space_memory, + dev->indicators->addr, + MEMTXATTRS_UNSPECIFIED, + NULL); + indicators |= 1ULL << vector; + address_space_stq(&address_space_memory, dev->indicators->addr, + indicators, MEMTXATTRS_UNSPECIFIED, NULL); + css_conditional_io_interrupt(sch); + } + } else { + if (!dev->indicators2) { + return; + } + indicators = address_space_ldq(&address_space_memory, + dev->indicators2->addr, + MEMTXATTRS_UNSPECIFIED, + NULL); + indicators |= 1ULL; + address_space_stq(&address_space_memory, dev->indicators2->addr, + indicators, MEMTXATTRS_UNSPECIFIED, NULL); + css_conditional_io_interrupt(sch); + } +} + +static void virtio_ccw_reset(DeviceState *d) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); + + virtio_ccw_reset_virtio(dev, vdev); + if (vdc->parent_reset) { + vdc->parent_reset(d); + } +} + +static void virtio_ccw_vmstate_change(DeviceState *d, bool running) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + + if (running) { + virtio_ccw_start_ioeventfd(dev); + } else { + virtio_ccw_stop_ioeventfd(dev); + } +} + +static bool virtio_ccw_query_guest_notifiers(DeviceState *d) +{ + CcwDevice *dev = CCW_DEVICE(d); + + return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA); +} + +static int virtio_ccw_get_mappings(VirtioCcwDevice *dev) +{ + int r; + CcwDevice *ccw_dev = CCW_DEVICE(dev); + + if (!ccw_dev->sch->thinint_active) { + return -EINVAL; + } + + r = map_indicator(&dev->routes.adapter, dev->summary_indicator); + if (r) { + return r; + } + r = map_indicator(&dev->routes.adapter, dev->indicators); + if (r) { + return r; + } + dev->routes.adapter.summary_addr = dev->summary_indicator->map; + dev->routes.adapter.ind_addr = dev->indicators->map; + + return 0; +} + +static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs) +{ + int i; + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + int ret; + S390FLICState *fs = s390_get_flic(); + S390FLICStateClass *fsc = s390_get_flic_class(fs); + + ret = virtio_ccw_get_mappings(dev); + if (ret) { + return ret; + } + for (i = 0; i < nvqs; i++) { + if (!virtio_queue_get_num(vdev, i)) { + break; + } + } + dev->routes.num_routes = i; + return fsc->add_adapter_routes(fs, &dev->routes); +} + +static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs) +{ + S390FLICState *fs = s390_get_flic(); + S390FLICStateClass *fsc = s390_get_flic_class(fs); + + fsc->release_adapter_routes(fs, &dev->routes); +} + +static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n) +{ + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + VirtQueue *vq = virtio_get_queue(vdev, n); + EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); + + return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, notifier, NULL, + dev->routes.gsi[n]); +} + +static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n) +{ + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + VirtQueue *vq = virtio_get_queue(vdev, n); + EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); + int ret; + + ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, notifier, + dev->routes.gsi[n]); + assert(ret == 0); +} + +static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n, + bool assign, bool with_irqfd) +{ + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + VirtQueue *vq = virtio_get_queue(vdev, n); + EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); + VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); + + if (assign) { + int r = event_notifier_init(notifier, 0); + + if (r < 0) { + return r; + } + virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); + if (with_irqfd) { + r = virtio_ccw_add_irqfd(dev, n); + if (r) { + virtio_queue_set_guest_notifier_fd_handler(vq, false, + with_irqfd); + return r; + } + } + /* + * We do not support individual masking for channel devices, so we + * need to manually trigger any guest masking callbacks here. + */ + if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { + k->guest_notifier_mask(vdev, n, false); + } + /* get lost events and re-inject */ + if (k->guest_notifier_pending && + k->guest_notifier_pending(vdev, n)) { + event_notifier_set(notifier); + } + } else { + if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { + k->guest_notifier_mask(vdev, n, true); + } + if (with_irqfd) { + virtio_ccw_remove_irqfd(dev, n); + } + virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); + event_notifier_cleanup(notifier); + } + return 0; +} + +static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs, + bool assigned) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + CcwDevice *ccw_dev = CCW_DEVICE(d); + bool with_irqfd = ccw_dev->sch->thinint_active && kvm_irqfds_enabled(); + int r, n; + + if (with_irqfd && assigned) { + /* irq routes need to be set up before assigning irqfds */ + r = virtio_ccw_setup_irqroutes(dev, nvqs); + if (r < 0) { + goto irqroute_error; + } + } + for (n = 0; n < nvqs; n++) { + if (!virtio_queue_get_num(vdev, n)) { + break; + } + r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd); + if (r < 0) { + goto assign_error; + } + } + if (with_irqfd && !assigned) { + /* release irq routes after irqfds have been released */ + virtio_ccw_release_irqroutes(dev, nvqs); + } + return 0; + +assign_error: + while (--n >= 0) { + virtio_ccw_set_guest_notifier(dev, n, !assigned, false); + } +irqroute_error: + if (with_irqfd && assigned) { + virtio_ccw_release_irqroutes(dev, nvqs); + } + return r; +} + +static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + + qemu_put_be16(f, virtio_queue_vector(vdev, n)); +} + +static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + uint16_t vector; + + qemu_get_be16s(f, &vector); + virtio_queue_set_vector(vdev, n , vector); + + return 0; +} + +static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + vmstate_save_state(f, &vmstate_virtio_ccw_dev, dev, NULL); +} + +static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + return vmstate_load_state(f, &vmstate_virtio_ccw_dev, dev, 1); +} + +static void virtio_ccw_pre_plugged(DeviceState *d, Error **errp) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + + if (dev->max_rev >= 1) { + virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); + } +} + +/* This is called by virtio-bus just after the device is plugged. */ +static void virtio_ccw_device_plugged(DeviceState *d, Error **errp) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); + CcwDevice *ccw_dev = CCW_DEVICE(d); + SubchDev *sch = ccw_dev->sch; + int n = virtio_get_num_queues(vdev); + S390FLICState *flic = s390_get_flic(); + + if (!virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { + dev->max_rev = 0; + } + + if (!virtio_ccw_rev_max(dev) && !virtio_legacy_allowed(vdev)) { + /* + * To avoid migration issues, we allow legacy mode when legacy + * check is disabled in the old machine types (< 5.1). + */ + if (virtio_legacy_check_disabled(vdev)) { + warn_report("device requires revision >= 1, but for backward " + "compatibility max_revision=0 is allowed"); + } else { + error_setg(errp, "Invalid value of property max_rev " + "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); + return; + } + } + + if (virtio_get_num_queues(vdev) > VIRTIO_QUEUE_MAX) { + error_setg(errp, "The number of virtqueues %d " + "exceeds virtio limit %d", n, + VIRTIO_QUEUE_MAX); + return; + } + if (virtio_get_num_queues(vdev) > flic->adapter_routes_max_batch) { + error_setg(errp, "The number of virtqueues %d " + "exceeds flic adapter route limit %d", n, + flic->adapter_routes_max_batch); + return; + } + + sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus); + + + css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, + d->hotplugged, 1); +} + +static void virtio_ccw_device_unplugged(DeviceState *d) +{ + VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); + + virtio_ccw_stop_ioeventfd(dev); +} +/**************** Virtio-ccw Bus Device Descriptions *******************/ + +static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp) +{ + VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; + + virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev); + virtio_ccw_device_realize(_dev, errp); +} + +static void virtio_ccw_busdev_unrealize(DeviceState *dev) +{ + VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; + + virtio_ccw_device_unrealize(_dev); +} + +static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev, + DeviceState *dev, Error **errp) +{ + VirtioCcwDevice *_dev = to_virtio_ccw_dev_fast(dev); + + virtio_ccw_stop_ioeventfd(_dev); +} + +static void virtio_ccw_device_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + CCWDeviceClass *k = CCW_DEVICE_CLASS(dc); + VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_CLASS(klass); + + k->unplug = virtio_ccw_busdev_unplug; + dc->realize = virtio_ccw_busdev_realize; + dc->unrealize = virtio_ccw_busdev_unrealize; + device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset); +} + +static const TypeInfo virtio_ccw_device_info = { + .name = TYPE_VIRTIO_CCW_DEVICE, + .parent = TYPE_CCW_DEVICE, + .instance_size = sizeof(VirtioCcwDevice), + .class_init = virtio_ccw_device_class_init, + .class_size = sizeof(VirtIOCCWDeviceClass), + .abstract = true, +}; + +/* virtio-ccw-bus */ + +static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, + VirtioCcwDevice *dev) +{ + DeviceState *qdev = DEVICE(dev); + char virtio_bus_name[] = "virtio-bus"; + + qbus_init(bus, bus_size, TYPE_VIRTIO_CCW_BUS, qdev, virtio_bus_name); +} + +static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data) +{ + VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); + BusClass *bus_class = BUS_CLASS(klass); + + bus_class->max_dev = 1; + k->notify = virtio_ccw_notify; + k->vmstate_change = virtio_ccw_vmstate_change; + k->query_guest_notifiers = virtio_ccw_query_guest_notifiers; + k->set_guest_notifiers = virtio_ccw_set_guest_notifiers; + k->save_queue = virtio_ccw_save_queue; + k->load_queue = virtio_ccw_load_queue; + k->save_config = virtio_ccw_save_config; + k->load_config = virtio_ccw_load_config; + k->pre_plugged = virtio_ccw_pre_plugged; + k->device_plugged = virtio_ccw_device_plugged; + k->device_unplugged = virtio_ccw_device_unplugged; + k->ioeventfd_enabled = virtio_ccw_ioeventfd_enabled; + k->ioeventfd_assign = virtio_ccw_ioeventfd_assign; +} + +static const TypeInfo virtio_ccw_bus_info = { + .name = TYPE_VIRTIO_CCW_BUS, + .parent = TYPE_VIRTIO_BUS, + .instance_size = sizeof(VirtioCcwBusState), + .class_size = sizeof(VirtioCcwBusClass), + .class_init = virtio_ccw_bus_class_init, +}; + +static void virtio_ccw_register(void) +{ + type_register_static(&virtio_ccw_bus_info); + type_register_static(&virtio_ccw_device_info); +} + +type_init(virtio_ccw_register) |