/* * 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); 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 = 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)