X-Git-Url: https://repo.jachan.dev/qemu.git/blobdiff_plain/066ae4f829bcc6b8c98994a7c22fe570d500d548..650a379d505bf558bcb41124bc6c951a76cbc113:/hw/vfio/ccw.c diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c index 12d0262336..03a2becb3e 100644 --- a/hw/vfio/ccw.c +++ b/hw/vfio/ccw.c @@ -6,33 +6,45 @@ * Xiao Feng Ren * Pierre Morel * - * This work is licensed under the terms of the GNU GPL, version 2 or(at - * your option) any version. See the COPYING file in the top-level + * 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 #include #include -#include "qemu/osdep.h" #include "qapi/error.h" #include "hw/sysbus.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/s390x/ccw-device.h" +#include "exec/address-spaces.h" #include "qemu/error-report.h" +#include "qemu/module.h" -#define TYPE_VFIO_CCW "vfio-ccw" -typedef struct VFIOCCWDevice { +struct VFIOCCWDevice { S390CCWDevice cdev; VFIODevice vdev; uint64_t io_region_size; uint64_t io_region_offset; struct ccw_io_region *io_region; EventNotifier io_notifier; -} VFIOCCWDevice; + 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) { @@ -47,21 +59,33 @@ struct VFIODeviceOps vfio_ccw_ops = { .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset, }; -static int vfio_ccw_handle_request(ORB *orb, SCSW *scsw, void *data) +static IOInstEnding vfio_ccw_handle_request(SubchDev *sch) { - S390CCWDevice *cdev = data; + 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)) { + if (!(vcdev->force_orb_pfch)) { + warn_once_pfch(vcdev, sch, "requires PFCH flag set"); + sch_gen_unit_exception(sch); + css_inject_io_interrupt(sch); + return IOINST_CC_EXPECTED; + } else { + 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, orb, sizeof(ORB)); - memcpy(region->scsw_area, scsw, sizeof(SCSW)); + 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, @@ -71,10 +95,24 @@ again: goto again; } error_report("vfio-ccw: wirte I/O region failed with errno=%d", errno); - return -errno; + ret = -errno; + } else { + ret = region->ret_code; + } + 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; } - - return region->ret_code; } static void vfio_ccw_reset(DeviceState *dev) @@ -93,8 +131,8 @@ static void vfio_ccw_io_notifier_handler(void *opaque) S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev); CcwDevice *ccw_dev = CCW_DEVICE(cdev); SubchDev *sch = ccw_dev->sch; - SCSW *s = &sch->curr_status.scsw; - PMCW *p = &sch->curr_status.pmcw; + SCHIB *schib = &sch->curr_status; + SCSW s; IRB irb; int size; @@ -108,33 +146,33 @@ static void vfio_ccw_io_notifier_handler(void *opaque) switch (errno) { case ENODEV: /* Generate a deferred cc 3 condition. */ - s->flags |= SCSW_FLAGS_MASK_CC; - s->ctrl &= ~SCSW_CTRL_MASK_STCTL; - s->ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND); + 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. */ - s->ctrl &= ~SCSW_ACTL_START_PEND; - s->cstat = SCSW_CSTAT_DATA_CHECK; - s->ctrl &= ~SCSW_CTRL_MASK_STCTL; - s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | + 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. */ - s->ctrl &= ~SCSW_ACTL_START_PEND; - s->cstat = SCSW_CSTAT_PROG_CHECK; - s->ctrl &= ~SCSW_CTRL_MASK_STCTL; - s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | + 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. */ - s->ctrl &= ~SCSW_ACTL_START_PEND; - s->cstat = SCSW_CSTAT_CHN_CTRL_CHK; - s->ctrl &= ~SCSW_CTRL_MASK_STCTL; - s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | + 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; } @@ -142,11 +180,13 @@ static void vfio_ccw_io_notifier_handler(void *opaque) memcpy(&irb, region->irb_area, sizeof(IRB)); /* Update control block via irb. */ - copy_scsw_to_guest(s, &irb.scsw); + s = schib->scsw; + copy_scsw_to_guest(&s, &irb.scsw); + schib->scsw = s; /* If a uint check is pending, copy sense data. */ - if ((s->dstat & SCSW_DSTAT_UNIT_CHECK) && - (p->chars & PMCW_CHARS_MASK_CSENSE)) { + if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) && + (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) { memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw)); } @@ -168,7 +208,7 @@ static void vfio_ccw_register_io_notifier(VFIOCCWDevice *vcdev, Error **errp) return; } - argsz = sizeof(*irq_set); + argsz = sizeof(*irq_info); irq_info = g_malloc0(argsz); irq_info->index = VFIO_CCW_IO_IRQ_INDEX; irq_info->argsz = argsz; @@ -278,12 +318,52 @@ static void vfio_ccw_put_region(VFIOCCWDevice *vcdev) g_free(vcdev->io_region); } -static void vfio_put_device(VFIOCCWDevice *vcdev) +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 + * memory ballooning, ie. pages pinned in the host are in the current + * working set of the guest driver and therefore never overlap with pages + * available to the guest balloon driver. This needs to be set before + * vfio_get_device() for vfio common to handle the balloon inhibitor. + */ + vcdev->vdev.balloon_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]; @@ -313,7 +393,6 @@ static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp) static void vfio_ccw_realize(DeviceState *dev, Error **errp) { - VFIODevice *vbasedev; VFIOGroup *group; CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev); S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev); @@ -334,19 +413,8 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp) goto out_group_err; } - vcdev->vdev.ops = &vfio_ccw_ops; - vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW; - vcdev->vdev.name = g_strdup_printf("%x.%x.%04x", cdev->hostid.cssid, - cdev->hostid.ssid, cdev->hostid.devid); - QLIST_FOREACH(vbasedev, &group->device_list, next) { - if (strcmp(vbasedev->name, vcdev->vdev.name) == 0) { - error_setg(&err, "vfio: subchannel %s has already been attached", - vcdev->vdev.name); - goto out_device_err; - } - } - - if (vfio_get_device(group, cdev->mdevid, &vcdev->vdev, &err)) { + vfio_ccw_get_device(group, vcdev, &err); + if (err) { goto out_device_err; } @@ -365,7 +433,7 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp) out_notifier_err: vfio_ccw_put_region(vcdev); out_region_err: - vfio_put_device(vcdev); + vfio_ccw_put_device(vcdev); out_device_err: vfio_put_group(group); out_group_err: @@ -386,7 +454,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp) vfio_ccw_unregister_io_notifier(vcdev); vfio_ccw_put_region(vcdev); - vfio_put_device(vcdev); + vfio_ccw_put_device(vcdev); vfio_put_group(group); if (cdc->unrealize) { @@ -396,11 +464,12 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp) 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 = TYPE_VFIO_CCW, + .name = "vfio-ccw", .unmigratable = 1, }; @@ -412,6 +481,7 @@ static void vfio_ccw_class_init(ObjectClass *klass, void *data) dc->props = 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;