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-rw-r--r--hw/vfio/ccw.c791
1 files changed, 791 insertions, 0 deletions
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
new file mode 100644
index 000000000..035473766
--- /dev/null
+++ b/hw/vfio/ccw.c
@@ -0,0 +1,791 @@
+/*
+ * vfio based subchannel assignment support
+ *
+ * Copyright 2017 IBM Corp.
+ * Copyright 2019 Red Hat, Inc.
+ *
+ * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
+ * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
+ * Pierre Morel <pmorel@linux.vnet.ibm.com>
+ * Cornelia Huck <cohuck@redhat.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 <linux/vfio.h>
+#include <linux/vfio_ccw.h>
+#include <sys/ioctl.h>
+
+#include "qapi/error.h"
+#include "hw/vfio/vfio.h"
+#include "hw/vfio/vfio-common.h"
+#include "hw/s390x/s390-ccw.h"
+#include "hw/s390x/vfio-ccw.h"
+#include "hw/qdev-properties.h"
+#include "hw/s390x/ccw-device.h"
+#include "exec/address-spaces.h"
+#include "qemu/error-report.h"
+#include "qemu/main-loop.h"
+#include "qemu/module.h"
+
+struct VFIOCCWDevice {
+ S390CCWDevice cdev;
+ VFIODevice vdev;
+ uint64_t io_region_size;
+ uint64_t io_region_offset;
+ struct ccw_io_region *io_region;
+ uint64_t async_cmd_region_size;
+ uint64_t async_cmd_region_offset;
+ struct ccw_cmd_region *async_cmd_region;
+ uint64_t schib_region_size;
+ uint64_t schib_region_offset;
+ struct ccw_schib_region *schib_region;
+ uint64_t crw_region_size;
+ uint64_t crw_region_offset;
+ struct ccw_crw_region *crw_region;
+ EventNotifier io_notifier;
+ EventNotifier crw_notifier;
+ EventNotifier req_notifier;
+ bool force_orb_pfch;
+ bool warned_orb_pfch;
+};
+
+static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
+ const char *msg)
+{
+ warn_report_once_cond(&vcdev->warned_orb_pfch,
+ "vfio-ccw (devno %x.%x.%04x): %s",
+ sch->cssid, sch->ssid, sch->devno, msg);
+}
+
+static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
+{
+ vdev->needs_reset = false;
+}
+
+/*
+ * We don't need vfio_hot_reset_multi and vfio_eoi operations for
+ * vfio_ccw device now.
+ */
+struct VFIODeviceOps vfio_ccw_ops = {
+ .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
+};
+
+static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
+{
+ S390CCWDevice *cdev = sch->driver_data;
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ struct ccw_io_region *region = vcdev->io_region;
+ int ret;
+
+ if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH) && vcdev->force_orb_pfch) {
+ sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
+ warn_once_pfch(vcdev, sch, "PFCH flag forced");
+ }
+
+ QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
+ QEMU_BUILD_BUG_ON(sizeof(region->scsw_area) != sizeof(SCSW));
+ QEMU_BUILD_BUG_ON(sizeof(region->irb_area) != sizeof(IRB));
+
+ memset(region, 0, sizeof(*region));
+
+ memcpy(region->orb_area, &sch->orb, sizeof(ORB));
+ memcpy(region->scsw_area, &sch->curr_status.scsw, sizeof(SCSW));
+
+again:
+ ret = pwrite(vcdev->vdev.fd, region,
+ vcdev->io_region_size, vcdev->io_region_offset);
+ if (ret != vcdev->io_region_size) {
+ if (errno == EAGAIN) {
+ goto again;
+ }
+ error_report("vfio-ccw: write I/O region failed with errno=%d", errno);
+ ret = errno ? -errno : -EFAULT;
+ } else {
+ ret = 0;
+ }
+ switch (ret) {
+ case 0:
+ return IOINST_CC_EXPECTED;
+ case -EBUSY:
+ return IOINST_CC_BUSY;
+ case -ENODEV:
+ case -EACCES:
+ return IOINST_CC_NOT_OPERATIONAL;
+ case -EFAULT:
+ default:
+ sch_gen_unit_exception(sch);
+ css_inject_io_interrupt(sch);
+ return IOINST_CC_EXPECTED;
+ }
+}
+
+static IOInstEnding vfio_ccw_handle_store(SubchDev *sch)
+{
+ S390CCWDevice *cdev = sch->driver_data;
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ SCHIB *schib = &sch->curr_status;
+ struct ccw_schib_region *region = vcdev->schib_region;
+ SCHIB *s;
+ int ret;
+
+ /* schib region not available so nothing else to do */
+ if (!region) {
+ return IOINST_CC_EXPECTED;
+ }
+
+ memset(region, 0, sizeof(*region));
+ ret = pread(vcdev->vdev.fd, region, vcdev->schib_region_size,
+ vcdev->schib_region_offset);
+
+ if (ret == -1) {
+ /*
+ * Device is probably damaged, but store subchannel does not
+ * have a nonzero cc defined for this scenario. Log an error,
+ * and presume things are otherwise fine.
+ */
+ error_report("vfio-ccw: store region read failed with errno=%d", errno);
+ return IOINST_CC_EXPECTED;
+ }
+
+ /*
+ * Selectively copy path-related bits of the SCHIB,
+ * rather than copying the entire struct.
+ */
+ s = (SCHIB *)region->schib_area;
+ schib->pmcw.pnom = s->pmcw.pnom;
+ schib->pmcw.lpum = s->pmcw.lpum;
+ schib->pmcw.pam = s->pmcw.pam;
+ schib->pmcw.pom = s->pmcw.pom;
+
+ if (s->scsw.flags & SCSW_FLAGS_MASK_PNO) {
+ schib->scsw.flags |= SCSW_FLAGS_MASK_PNO;
+ }
+
+ return IOINST_CC_EXPECTED;
+}
+
+static int vfio_ccw_handle_clear(SubchDev *sch)
+{
+ S390CCWDevice *cdev = sch->driver_data;
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ struct ccw_cmd_region *region = vcdev->async_cmd_region;
+ int ret;
+
+ if (!vcdev->async_cmd_region) {
+ /* Async command region not available, fall back to emulation */
+ return -ENOSYS;
+ }
+
+ memset(region, 0, sizeof(*region));
+ region->command = VFIO_CCW_ASYNC_CMD_CSCH;
+
+again:
+ ret = pwrite(vcdev->vdev.fd, region,
+ vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
+ if (ret != vcdev->async_cmd_region_size) {
+ if (errno == EAGAIN) {
+ goto again;
+ }
+ error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
+ ret = errno ? -errno : -EFAULT;
+ } else {
+ ret = 0;
+ }
+ switch (ret) {
+ case 0:
+ case -ENODEV:
+ case -EACCES:
+ return ret;
+ case -EFAULT:
+ default:
+ sch_gen_unit_exception(sch);
+ css_inject_io_interrupt(sch);
+ return 0;
+ }
+}
+
+static int vfio_ccw_handle_halt(SubchDev *sch)
+{
+ S390CCWDevice *cdev = sch->driver_data;
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ struct ccw_cmd_region *region = vcdev->async_cmd_region;
+ int ret;
+
+ if (!vcdev->async_cmd_region) {
+ /* Async command region not available, fall back to emulation */
+ return -ENOSYS;
+ }
+
+ memset(region, 0, sizeof(*region));
+ region->command = VFIO_CCW_ASYNC_CMD_HSCH;
+
+again:
+ ret = pwrite(vcdev->vdev.fd, region,
+ vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
+ if (ret != vcdev->async_cmd_region_size) {
+ if (errno == EAGAIN) {
+ goto again;
+ }
+ error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
+ ret = errno ? -errno : -EFAULT;
+ } else {
+ ret = 0;
+ }
+ switch (ret) {
+ case 0:
+ case -EBUSY:
+ case -ENODEV:
+ case -EACCES:
+ return ret;
+ case -EFAULT:
+ default:
+ sch_gen_unit_exception(sch);
+ css_inject_io_interrupt(sch);
+ return 0;
+ }
+}
+
+static void vfio_ccw_reset(DeviceState *dev)
+{
+ CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
+ S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+
+ ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
+}
+
+static void vfio_ccw_crw_read(VFIOCCWDevice *vcdev)
+{
+ struct ccw_crw_region *region = vcdev->crw_region;
+ CRW crw;
+ int size;
+
+ /* Keep reading CRWs as long as data is returned */
+ do {
+ memset(region, 0, sizeof(*region));
+ size = pread(vcdev->vdev.fd, region, vcdev->crw_region_size,
+ vcdev->crw_region_offset);
+
+ if (size == -1) {
+ error_report("vfio-ccw: Read crw region failed with errno=%d",
+ errno);
+ break;
+ }
+
+ if (region->crw == 0) {
+ /* No more CRWs to queue */
+ break;
+ }
+
+ memcpy(&crw, &region->crw, sizeof(CRW));
+
+ css_crw_add_to_queue(crw);
+ } while (1);
+}
+
+static void vfio_ccw_req_notifier_handler(void *opaque)
+{
+ VFIOCCWDevice *vcdev = opaque;
+ Error *err = NULL;
+
+ if (!event_notifier_test_and_clear(&vcdev->req_notifier)) {
+ return;
+ }
+
+ qdev_unplug(DEVICE(vcdev), &err);
+ if (err) {
+ warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
+ }
+}
+
+static void vfio_ccw_crw_notifier_handler(void *opaque)
+{
+ VFIOCCWDevice *vcdev = opaque;
+
+ while (event_notifier_test_and_clear(&vcdev->crw_notifier)) {
+ vfio_ccw_crw_read(vcdev);
+ }
+}
+
+static void vfio_ccw_io_notifier_handler(void *opaque)
+{
+ VFIOCCWDevice *vcdev = opaque;
+ struct ccw_io_region *region = vcdev->io_region;
+ S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev);
+ CcwDevice *ccw_dev = CCW_DEVICE(cdev);
+ SubchDev *sch = ccw_dev->sch;
+ SCHIB *schib = &sch->curr_status;
+ SCSW s;
+ IRB irb;
+ ESW esw;
+ int size;
+
+ if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
+ return;
+ }
+
+ size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
+ vcdev->io_region_offset);
+ if (size == -1) {
+ switch (errno) {
+ case ENODEV:
+ /* Generate a deferred cc 3 condition. */
+ schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
+ schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
+ goto read_err;
+ case EFAULT:
+ /* Memory problem, generate channel data check. */
+ schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
+ schib->scsw.cstat = SCSW_CSTAT_DATA_CHECK;
+ schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
+ SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
+ goto read_err;
+ default:
+ /* Error, generate channel program check. */
+ schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
+ schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
+ schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
+ SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
+ goto read_err;
+ }
+ } else if (size != vcdev->io_region_size) {
+ /* Information transfer error, generate channel-control check. */
+ schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
+ schib->scsw.cstat = SCSW_CSTAT_CHN_CTRL_CHK;
+ schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
+ SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
+ goto read_err;
+ }
+
+ memcpy(&irb, region->irb_area, sizeof(IRB));
+
+ /* Update control block via irb. */
+ s = schib->scsw;
+ copy_scsw_to_guest(&s, &irb.scsw);
+ schib->scsw = s;
+
+ copy_esw_to_guest(&esw, &irb.esw);
+ sch->esw = esw;
+
+ /* If a uint check is pending, copy sense data. */
+ if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
+ (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
+ memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
+ }
+
+read_err:
+ css_inject_io_interrupt(sch);
+}
+
+static void vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
+ unsigned int irq,
+ Error **errp)
+{
+ VFIODevice *vdev = &vcdev->vdev;
+ struct vfio_irq_info *irq_info;
+ size_t argsz;
+ int fd;
+ EventNotifier *notifier;
+ IOHandler *fd_read;
+
+ switch (irq) {
+ case VFIO_CCW_IO_IRQ_INDEX:
+ notifier = &vcdev->io_notifier;
+ fd_read = vfio_ccw_io_notifier_handler;
+ break;
+ case VFIO_CCW_CRW_IRQ_INDEX:
+ notifier = &vcdev->crw_notifier;
+ fd_read = vfio_ccw_crw_notifier_handler;
+ break;
+ case VFIO_CCW_REQ_IRQ_INDEX:
+ notifier = &vcdev->req_notifier;
+ fd_read = vfio_ccw_req_notifier_handler;
+ break;
+ default:
+ error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
+ return;
+ }
+
+ if (vdev->num_irqs < irq + 1) {
+ error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
+ irq, vdev->num_irqs);
+ return;
+ }
+
+ argsz = sizeof(*irq_info);
+ irq_info = g_malloc0(argsz);
+ irq_info->index = irq;
+ irq_info->argsz = argsz;
+ if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
+ irq_info) < 0 || irq_info->count < 1) {
+ error_setg_errno(errp, errno, "vfio: Error getting irq info");
+ goto out_free_info;
+ }
+
+ if (event_notifier_init(notifier, 0)) {
+ error_setg_errno(errp, errno,
+ "vfio: Unable to init event notifier for irq (%d)",
+ irq);
+ goto out_free_info;
+ }
+
+ fd = event_notifier_get_fd(notifier);
+ qemu_set_fd_handler(fd, fd_read, NULL, vcdev);
+
+ if (vfio_set_irq_signaling(vdev, irq, 0,
+ VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
+ qemu_set_fd_handler(fd, NULL, NULL, vcdev);
+ event_notifier_cleanup(notifier);
+ }
+
+out_free_info:
+ g_free(irq_info);
+}
+
+static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
+ unsigned int irq)
+{
+ Error *err = NULL;
+ EventNotifier *notifier;
+
+ switch (irq) {
+ case VFIO_CCW_IO_IRQ_INDEX:
+ notifier = &vcdev->io_notifier;
+ break;
+ case VFIO_CCW_CRW_IRQ_INDEX:
+ notifier = &vcdev->crw_notifier;
+ break;
+ case VFIO_CCW_REQ_IRQ_INDEX:
+ notifier = &vcdev->req_notifier;
+ break;
+ default:
+ error_report("vfio: Unsupported device irq(%d)", irq);
+ return;
+ }
+
+ if (vfio_set_irq_signaling(&vcdev->vdev, irq, 0,
+ VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
+ warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
+ }
+
+ qemu_set_fd_handler(event_notifier_get_fd(notifier),
+ NULL, NULL, vcdev);
+ event_notifier_cleanup(notifier);
+}
+
+static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
+{
+ VFIODevice *vdev = &vcdev->vdev;
+ struct vfio_region_info *info;
+ int ret;
+
+ /* Sanity check device */
+ if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
+ error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
+ return;
+ }
+
+ /*
+ * We always expect at least the I/O region to be present. We also
+ * may have a variable number of regions governed by capabilities.
+ */
+ if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
+ error_setg(errp, "vfio: too few regions (%u), expected at least %u",
+ vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
+ return;
+ }
+
+ ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
+ if (ret) {
+ error_setg_errno(errp, -ret, "vfio: Error getting config info");
+ return;
+ }
+
+ vcdev->io_region_size = info->size;
+ if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
+ error_setg(errp, "vfio: Unexpected size of the I/O region");
+ goto out_err;
+ }
+
+ vcdev->io_region_offset = info->offset;
+ vcdev->io_region = g_malloc0(info->size);
+ g_free(info);
+
+ /* check for the optional async command region */
+ ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
+ VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &info);
+ if (!ret) {
+ vcdev->async_cmd_region_size = info->size;
+ if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
+ error_setg(errp, "vfio: Unexpected size of the async cmd region");
+ goto out_err;
+ }
+ vcdev->async_cmd_region_offset = info->offset;
+ vcdev->async_cmd_region = g_malloc0(info->size);
+ g_free(info);
+ }
+
+ ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
+ VFIO_REGION_SUBTYPE_CCW_SCHIB, &info);
+ if (!ret) {
+ vcdev->schib_region_size = info->size;
+ if (sizeof(*vcdev->schib_region) != vcdev->schib_region_size) {
+ error_setg(errp, "vfio: Unexpected size of the schib region");
+ goto out_err;
+ }
+ vcdev->schib_region_offset = info->offset;
+ vcdev->schib_region = g_malloc(info->size);
+ g_free(info);
+ }
+
+ ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
+ VFIO_REGION_SUBTYPE_CCW_CRW, &info);
+
+ if (!ret) {
+ vcdev->crw_region_size = info->size;
+ if (sizeof(*vcdev->crw_region) != vcdev->crw_region_size) {
+ error_setg(errp, "vfio: Unexpected size of the CRW region");
+ goto out_err;
+ }
+ vcdev->crw_region_offset = info->offset;
+ vcdev->crw_region = g_malloc(info->size);
+ g_free(info);
+ }
+
+ return;
+
+out_err:
+ g_free(vcdev->crw_region);
+ g_free(vcdev->schib_region);
+ g_free(vcdev->async_cmd_region);
+ g_free(vcdev->io_region);
+ g_free(info);
+ return;
+}
+
+static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
+{
+ g_free(vcdev->crw_region);
+ g_free(vcdev->schib_region);
+ g_free(vcdev->async_cmd_region);
+ g_free(vcdev->io_region);
+}
+
+static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
+{
+ g_free(vcdev->vdev.name);
+ vfio_put_base_device(&vcdev->vdev);
+}
+
+static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
+ Error **errp)
+{
+ char *name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
+ vcdev->cdev.hostid.ssid,
+ vcdev->cdev.hostid.devid);
+ VFIODevice *vbasedev;
+
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (strcmp(vbasedev->name, name) == 0) {
+ error_setg(errp, "vfio: subchannel %s has already been attached",
+ name);
+ goto out_err;
+ }
+ }
+
+ /*
+ * All vfio-ccw devices are believed to operate in a way compatible with
+ * discarding of memory in RAM blocks, ie. pages pinned in the host are
+ * in the current working set of the guest driver and therefore never
+ * overlap e.g., with pages available to the guest balloon driver. This
+ * needs to be set before vfio_get_device() for vfio common to handle
+ * ram_block_discard_disable().
+ */
+ vcdev->vdev.ram_block_discard_allowed = true;
+
+ if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
+ goto out_err;
+ }
+
+ vcdev->vdev.ops = &vfio_ccw_ops;
+ vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
+ vcdev->vdev.name = name;
+ vcdev->vdev.dev = &vcdev->cdev.parent_obj.parent_obj;
+
+ return;
+
+out_err:
+ g_free(name);
+}
+
+static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
+{
+ char *tmp, group_path[PATH_MAX];
+ ssize_t len;
+ int groupid;
+
+ tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group",
+ cdev->hostid.cssid, cdev->hostid.ssid,
+ cdev->hostid.devid, cdev->mdevid);
+ len = readlink(tmp, group_path, sizeof(group_path));
+ g_free(tmp);
+
+ if (len <= 0 || len >= sizeof(group_path)) {
+ error_setg(errp, "vfio: no iommu_group found");
+ return NULL;
+ }
+
+ group_path[len] = 0;
+
+ if (sscanf(basename(group_path), "%d", &groupid) != 1) {
+ error_setg(errp, "vfio: failed to read %s", group_path);
+ return NULL;
+ }
+
+ return vfio_get_group(groupid, &address_space_memory, errp);
+}
+
+static void vfio_ccw_realize(DeviceState *dev, Error **errp)
+{
+ VFIOGroup *group;
+ CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
+ S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
+ Error *err = NULL;
+
+ /* Call the class init function for subchannel. */
+ if (cdc->realize) {
+ cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
+ if (err) {
+ goto out_err_propagate;
+ }
+ }
+
+ group = vfio_ccw_get_group(cdev, &err);
+ if (!group) {
+ goto out_group_err;
+ }
+
+ vfio_ccw_get_device(group, vcdev, &err);
+ if (err) {
+ goto out_device_err;
+ }
+
+ vfio_ccw_get_region(vcdev, &err);
+ if (err) {
+ goto out_region_err;
+ }
+
+ vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, &err);
+ if (err) {
+ goto out_io_notifier_err;
+ }
+
+ if (vcdev->crw_region) {
+ vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX, &err);
+ if (err) {
+ goto out_irq_notifier_err;
+ }
+ }
+
+ vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX, &err);
+ if (err) {
+ /*
+ * Report this error, but do not make it a failing condition.
+ * Lack of this IRQ in the host does not prevent normal operation.
+ */
+ error_report_err(err);
+ }
+
+ return;
+
+out_irq_notifier_err:
+ vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
+ vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
+ vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
+out_io_notifier_err:
+ vfio_ccw_put_region(vcdev);
+out_region_err:
+ vfio_ccw_put_device(vcdev);
+out_device_err:
+ vfio_put_group(group);
+out_group_err:
+ if (cdc->unrealize) {
+ cdc->unrealize(cdev);
+ }
+out_err_propagate:
+ error_propagate(errp, err);
+}
+
+static void vfio_ccw_unrealize(DeviceState *dev)
+{
+ CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
+ S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
+ VFIOGroup *group = vcdev->vdev.group;
+
+ vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
+ vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
+ vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
+ vfio_ccw_put_region(vcdev);
+ vfio_ccw_put_device(vcdev);
+ vfio_put_group(group);
+
+ if (cdc->unrealize) {
+ cdc->unrealize(cdev);
+ }
+}
+
+static Property vfio_ccw_properties[] = {
+ DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
+ DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vfio_ccw_vmstate = {
+ .name = "vfio-ccw",
+ .unmigratable = 1,
+};
+
+static void vfio_ccw_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
+
+ device_class_set_props(dc, vfio_ccw_properties);
+ dc->vmsd = &vfio_ccw_vmstate;
+ dc->desc = "VFIO-based subchannel assignment";
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+ dc->realize = vfio_ccw_realize;
+ dc->unrealize = vfio_ccw_unrealize;
+ dc->reset = vfio_ccw_reset;
+
+ cdc->handle_request = vfio_ccw_handle_request;
+ cdc->handle_halt = vfio_ccw_handle_halt;
+ cdc->handle_clear = vfio_ccw_handle_clear;
+ cdc->handle_store = vfio_ccw_handle_store;
+}
+
+static const TypeInfo vfio_ccw_info = {
+ .name = TYPE_VFIO_CCW,
+ .parent = TYPE_S390_CCW,
+ .instance_size = sizeof(VFIOCCWDevice),
+ .class_init = vfio_ccw_class_init,
+};
+
+static void register_vfio_ccw_type(void)
+{
+ type_register_static(&vfio_ccw_info);
+}
+
+type_init(register_vfio_ccw_type)