| /* |
| * 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/sysbus.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 "cpu.h" |
| #include "kvm_s390x.h" |
| #include "migration/vmstate.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/s390x/ap-bridge.h" |
| #include "exec/address-spaces.h" |
| |
| #define VFIO_AP_DEVICE_TYPE "vfio-ap" |
| |
| typedef struct VFIOAPDevice { |
| APDevice apdev; |
| VFIODevice vdev; |
| } VFIOAPDevice; |
| |
| #define VFIO_AP_DEVICE(obj) \ |
| OBJECT_CHECK(VFIOAPDevice, (obj), VFIO_AP_DEVICE_TYPE) |
| |
| 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", |
| VFIO_AP_DEVICE_TYPE, vapdev->vdev.sysfsdev, gerror->message); |
| 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 |
| * memory ballooning, as no pages are pinned in the host. |
| * This needs to be set before vfio_get_device() for vfio common to |
| * handle the balloon inhibitor. |
| */ |
| vapdev->vdev.balloon_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, Error **errp) |
| { |
| 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 = VFIO_AP_DEVICE_TYPE, |
| .parent = AP_DEVICE_TYPE, |
| .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) |