diff options
Diffstat (limited to 'hw/vfio/ap.c')
| -rw-r--r-- | hw/vfio/ap.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c new file mode 100644 index 000000000..e0dd561e8 --- /dev/null +++ b/hw/vfio/ap.c @@ -0,0 +1,186 @@ +/* + * VFIO based AP matrix device assignment + * + * Copyright 2018 IBM Corp. + * Author(s): Tony Krowiak <akrowiak@linux.ibm.com> + * Halil Pasic <pasic@linux.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 <linux/vfio.h> +#include <sys/ioctl.h> +#include "qapi/error.h" +#include "hw/vfio/vfio.h" +#include "hw/vfio/vfio-common.h" +#include "hw/s390x/ap-device.h" +#include "qemu/error-report.h" +#include "qemu/module.h" +#include "qemu/option.h" +#include "qemu/config-file.h" +#include "kvm/kvm_s390x.h" +#include "migration/vmstate.h" +#include "hw/qdev-properties.h" +#include "hw/s390x/ap-bridge.h" +#include "exec/address-spaces.h" +#include "qom/object.h" + +#define TYPE_VFIO_AP_DEVICE "vfio-ap" + +struct VFIOAPDevice { + APDevice apdev; + VFIODevice vdev; +}; + +OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE) + +static void vfio_ap_compute_needs_reset(VFIODevice *vdev) +{ + vdev->needs_reset = false; +} + +/* + * We don't need vfio_hot_reset_multi and vfio_eoi operations for + * vfio-ap device now. + */ +struct VFIODeviceOps vfio_ap_ops = { + .vfio_compute_needs_reset = vfio_ap_compute_needs_reset, +}; + +static void vfio_ap_put_device(VFIOAPDevice *vapdev) +{ + g_free(vapdev->vdev.name); + vfio_put_base_device(&vapdev->vdev); +} + +static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp) +{ + GError *gerror = NULL; + char *symlink, *group_path; + int groupid; + + symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev); + group_path = g_file_read_link(symlink, &gerror); + g_free(symlink); + + if (!group_path) { + error_setg(errp, "%s: no iommu_group found for %s: %s", + TYPE_VFIO_AP_DEVICE, vapdev->vdev.sysfsdev, gerror->message); + g_error_free(gerror); + return NULL; + } + + if (sscanf(basename(group_path), "%d", &groupid) != 1) { + error_setg(errp, "vfio: failed to read %s", group_path); + g_free(group_path); + return NULL; + } + + g_free(group_path); + + return vfio_get_group(groupid, &address_space_memory, errp); +} + +static void vfio_ap_realize(DeviceState *dev, Error **errp) +{ + int ret; + char *mdevid; + VFIOGroup *vfio_group; + APDevice *apdev = AP_DEVICE(dev); + VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev); + + vfio_group = vfio_ap_get_group(vapdev, errp); + if (!vfio_group) { + return; + } + + vapdev->vdev.ops = &vfio_ap_ops; + vapdev->vdev.type = VFIO_DEVICE_TYPE_AP; + mdevid = basename(vapdev->vdev.sysfsdev); + vapdev->vdev.name = g_strdup_printf("%s", mdevid); + vapdev->vdev.dev = dev; + + /* + * vfio-ap devices operate in a way compatible with discarding of + * memory in RAM blocks, as no pages are pinned in the host. + * This needs to be set before vfio_get_device() for vfio common to + * handle ram_block_discard_disable(). + */ + vapdev->vdev.ram_block_discard_allowed = true; + + ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, errp); + if (ret) { + goto out_get_dev_err; + } + + return; + +out_get_dev_err: + vfio_ap_put_device(vapdev); + vfio_put_group(vfio_group); +} + +static void vfio_ap_unrealize(DeviceState *dev) +{ + APDevice *apdev = AP_DEVICE(dev); + VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev); + VFIOGroup *group = vapdev->vdev.group; + + vfio_ap_put_device(vapdev); + vfio_put_group(group); +} + +static Property vfio_ap_properties[] = { + DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev), + DEFINE_PROP_END_OF_LIST(), +}; + +static void vfio_ap_reset(DeviceState *dev) +{ + int ret; + APDevice *apdev = AP_DEVICE(dev); + VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev); + + ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET); + if (ret) { + error_report("%s: failed to reset %s device: %s", __func__, + vapdev->vdev.name, strerror(errno)); + } +} + +static const VMStateDescription vfio_ap_vmstate = { + .name = "vfio-ap", + .unmigratable = 1, +}; + +static void vfio_ap_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + device_class_set_props(dc, vfio_ap_properties); + dc->vmsd = &vfio_ap_vmstate; + dc->desc = "VFIO-based AP device assignment"; + set_bit(DEVICE_CATEGORY_MISC, dc->categories); + dc->realize = vfio_ap_realize; + dc->unrealize = vfio_ap_unrealize; + dc->hotpluggable = true; + dc->reset = vfio_ap_reset; + dc->bus_type = TYPE_AP_BUS; +} + +static const TypeInfo vfio_ap_info = { + .name = TYPE_VFIO_AP_DEVICE, + .parent = TYPE_AP_DEVICE, + .instance_size = sizeof(VFIOAPDevice), + .class_init = vfio_ap_class_init, +}; + +static void vfio_ap_type_init(void) +{ + type_register_static(&vfio_ap_info); +} + +type_init(vfio_ap_type_init) |