diff options
Diffstat (limited to 'qemu/hw/intc/s390_flic_kvm.c')
| -rw-r--r-- | qemu/hw/intc/s390_flic_kvm.c | 435 |
1 files changed, 0 insertions, 435 deletions
diff --git a/qemu/hw/intc/s390_flic_kvm.c b/qemu/hw/intc/s390_flic_kvm.c deleted file mode 100644 index 02449b390..000000000 --- a/qemu/hw/intc/s390_flic_kvm.c +++ /dev/null @@ -1,435 +0,0 @@ -/* - * QEMU S390x KVM floating interrupt controller (flic) - * - * Copyright 2014 IBM Corp. - * Author(s): Jens Freimann <jfrei@linux.vnet.ibm.com> - * Cornelia Huck <cornelia.huck@de.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 <sys/ioctl.h> -#include "qemu/error-report.h" -#include "hw/sysbus.h" -#include "sysemu/kvm.h" -#include "migration/qemu-file.h" -#include "hw/s390x/s390_flic.h" -#include "hw/s390x/adapter.h" -#include "trace.h" - -#define FLIC_SAVE_INITIAL_SIZE getpagesize() -#define FLIC_FAILED (-1UL) -#define FLIC_SAVEVM_VERSION 1 - -typedef struct KVMS390FLICState { - S390FLICState parent_obj; - - uint32_t fd; -} KVMS390FLICState; - -DeviceState *s390_flic_kvm_create(void) -{ - DeviceState *dev = NULL; - - if (kvm_enabled()) { - dev = qdev_create(NULL, TYPE_KVM_S390_FLIC); - object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC, - OBJECT(dev), NULL); - } - return dev; -} - -/** - * flic_get_all_irqs - store all pending irqs in buffer - * @buf: pointer to buffer which is passed to kernel - * @len: length of buffer - * @flic: pointer to flic device state - * - * Returns: -ENOMEM if buffer is too small, - * -EINVAL if attr.group is invalid, - * -EFAULT if copying to userspace failed, - * on success return number of stored interrupts - */ -static int flic_get_all_irqs(KVMS390FLICState *flic, - void *buf, int len) -{ - struct kvm_device_attr attr = { - .group = KVM_DEV_FLIC_GET_ALL_IRQS, - .addr = (uint64_t) buf, - .attr = len, - }; - int rc; - - rc = ioctl(flic->fd, KVM_GET_DEVICE_ATTR, &attr); - - return rc == -1 ? -errno : rc; -} - -static void flic_enable_pfault(KVMS390FLICState *flic) -{ - struct kvm_device_attr attr = { - .group = KVM_DEV_FLIC_APF_ENABLE, - }; - int rc; - - rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr); - - if (rc) { - fprintf(stderr, "flic: couldn't enable pfault\n"); - } -} - -static void flic_disable_wait_pfault(KVMS390FLICState *flic) -{ - struct kvm_device_attr attr = { - .group = KVM_DEV_FLIC_APF_DISABLE_WAIT, - }; - int rc; - - rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr); - - if (rc) { - fprintf(stderr, "flic: couldn't disable pfault\n"); - } -} - -/** flic_enqueue_irqs - returns 0 on success - * @buf: pointer to buffer which is passed to kernel - * @len: length of buffer - * @flic: pointer to flic device state - * - * Returns: -EINVAL if attr.group is unknown - */ -static int flic_enqueue_irqs(void *buf, uint64_t len, - KVMS390FLICState *flic) -{ - int rc; - struct kvm_device_attr attr = { - .group = KVM_DEV_FLIC_ENQUEUE, - .addr = (uint64_t) buf, - .attr = len, - }; - - rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr); - - return rc ? -errno : 0; -} - -int kvm_s390_inject_flic(struct kvm_s390_irq *irq) -{ - static KVMS390FLICState *flic; - - if (unlikely(!flic)) { - flic = KVM_S390_FLIC(s390_get_flic()); - } - return flic_enqueue_irqs(irq, sizeof(*irq), flic); -} - -/** - * __get_all_irqs - store all pending irqs in buffer - * @flic: pointer to flic device state - * @buf: pointer to pointer to a buffer - * @len: length of buffer - * - * Returns: return value of flic_get_all_irqs - * Note: Retry and increase buffer size until flic_get_all_irqs - * either returns a value >= 0 or a negative error code. - * -ENOMEM is an exception, which means the buffer is too small - * and we should try again. Other negative error codes can be - * -EFAULT and -EINVAL which we ignore at this point - */ -static int __get_all_irqs(KVMS390FLICState *flic, - void **buf, int len) -{ - int r; - - do { - /* returns -ENOMEM if buffer is too small and number - * of queued interrupts on success */ - r = flic_get_all_irqs(flic, *buf, len); - if (r >= 0) { - break; - } - len *= 2; - *buf = g_try_realloc(*buf, len); - if (!buf) { - return -ENOMEM; - } - } while (r == -ENOMEM && len <= KVM_S390_FLIC_MAX_BUFFER); - - return r; -} - -static int kvm_s390_register_io_adapter(S390FLICState *fs, uint32_t id, - uint8_t isc, bool swap, - bool is_maskable) -{ - struct kvm_s390_io_adapter adapter = { - .id = id, - .isc = isc, - .maskable = is_maskable, - .swap = swap, - }; - KVMS390FLICState *flic = KVM_S390_FLIC(fs); - int r, ret; - struct kvm_device_attr attr = { - .group = KVM_DEV_FLIC_ADAPTER_REGISTER, - .addr = (uint64_t)&adapter, - }; - - if (!kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING)) { - /* nothing to do */ - return 0; - } - - r = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr); - - ret = r ? -errno : 0; - return ret; -} - -static int kvm_s390_io_adapter_map(S390FLICState *fs, uint32_t id, - uint64_t map_addr, bool do_map) -{ - struct kvm_s390_io_adapter_req req = { - .id = id, - .type = do_map ? KVM_S390_IO_ADAPTER_MAP : KVM_S390_IO_ADAPTER_UNMAP, - .addr = map_addr, - }; - struct kvm_device_attr attr = { - .group = KVM_DEV_FLIC_ADAPTER_MODIFY, - .addr = (uint64_t)&req, - }; - KVMS390FLICState *flic = KVM_S390_FLIC(fs); - int r; - - if (!kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING)) { - /* nothing to do */ - return 0; - } - - r = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr); - return r ? -errno : 0; -} - -static int kvm_s390_add_adapter_routes(S390FLICState *fs, - AdapterRoutes *routes) -{ - int ret, i; - uint64_t ind_offset = routes->adapter.ind_offset; - - for (i = 0; i < routes->num_routes; i++) { - ret = kvm_irqchip_add_adapter_route(kvm_state, &routes->adapter); - if (ret < 0) { - goto out_undo; - } - routes->gsi[i] = ret; - routes->adapter.ind_offset++; - } - kvm_irqchip_commit_routes(kvm_state); - - /* Restore passed-in structure to original state. */ - routes->adapter.ind_offset = ind_offset; - return 0; -out_undo: - while (--i >= 0) { - kvm_irqchip_release_virq(kvm_state, routes->gsi[i]); - routes->gsi[i] = -1; - } - routes->adapter.ind_offset = ind_offset; - return ret; -} - -static void kvm_s390_release_adapter_routes(S390FLICState *fs, - AdapterRoutes *routes) -{ - int i; - - for (i = 0; i < routes->num_routes; i++) { - if (routes->gsi[i] >= 0) { - kvm_irqchip_release_virq(kvm_state, routes->gsi[i]); - routes->gsi[i] = -1; - } - } -} - -/** - * kvm_flic_save - Save pending floating interrupts - * @f: QEMUFile containing migration state - * @opaque: pointer to flic device state - * - * Note: Pass buf and len to kernel. Start with one page and - * increase until buffer is sufficient or maxium size is - * reached - */ -static void kvm_flic_save(QEMUFile *f, void *opaque) -{ - KVMS390FLICState *flic = opaque; - int len = FLIC_SAVE_INITIAL_SIZE; - void *buf; - int count; - - flic_disable_wait_pfault((struct KVMS390FLICState *) opaque); - - buf = g_try_malloc0(len); - if (!buf) { - /* Storing FLIC_FAILED into the count field here will cause the - * target system to fail when attempting to load irqs from the - * migration state */ - error_report("flic: couldn't allocate memory"); - qemu_put_be64(f, FLIC_FAILED); - return; - } - - count = __get_all_irqs(flic, &buf, len); - if (count < 0) { - error_report("flic: couldn't retrieve irqs from kernel, rc %d", - count); - /* Storing FLIC_FAILED into the count field here will cause the - * target system to fail when attempting to load irqs from the - * migration state */ - qemu_put_be64(f, FLIC_FAILED); - } else { - qemu_put_be64(f, count); - qemu_put_buffer(f, (uint8_t *) buf, - count * sizeof(struct kvm_s390_irq)); - } - g_free(buf); -} - -/** - * kvm_flic_load - Load pending floating interrupts - * @f: QEMUFile containing migration state - * @opaque: pointer to flic device state - * @version_id: version id for migration - * - * Returns: value of flic_enqueue_irqs, -EINVAL on error - * Note: Do nothing when no interrupts where stored - * in QEMUFile - */ -static int kvm_flic_load(QEMUFile *f, void *opaque, int version_id) -{ - uint64_t len = 0; - uint64_t count = 0; - void *buf = NULL; - int r = 0; - - if (version_id != FLIC_SAVEVM_VERSION) { - r = -EINVAL; - goto out; - } - - flic_enable_pfault((struct KVMS390FLICState *) opaque); - - count = qemu_get_be64(f); - len = count * sizeof(struct kvm_s390_irq); - if (count == FLIC_FAILED) { - r = -EINVAL; - goto out; - } - if (count == 0) { - r = 0; - goto out; - } - buf = g_try_malloc0(len); - if (!buf) { - r = -ENOMEM; - goto out; - } - - if (qemu_get_buffer(f, (uint8_t *) buf, len) != len) { - r = -EINVAL; - goto out_free; - } - r = flic_enqueue_irqs(buf, len, (struct KVMS390FLICState *) opaque); - -out_free: - g_free(buf); -out: - return r; -} - -static void kvm_s390_flic_realize(DeviceState *dev, Error **errp) -{ - KVMS390FLICState *flic_state = KVM_S390_FLIC(dev); - struct kvm_create_device cd = {0}; - int ret; - - flic_state->fd = -1; - if (!kvm_check_extension(kvm_state, KVM_CAP_DEVICE_CTRL)) { - trace_flic_no_device_api(errno); - return; - } - - cd.type = KVM_DEV_TYPE_FLIC; - ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd); - if (ret < 0) { - trace_flic_create_device(errno); - return; - } - flic_state->fd = cd.fd; - - /* Register savevm handler for floating interrupts */ - register_savevm(NULL, "s390-flic", 0, 1, kvm_flic_save, - kvm_flic_load, (void *) flic_state); -} - -static void kvm_s390_flic_unrealize(DeviceState *dev, Error **errp) -{ - KVMS390FLICState *flic_state = KVM_S390_FLIC(dev); - - unregister_savevm(DEVICE(flic_state), "s390-flic", flic_state); -} - -static void kvm_s390_flic_reset(DeviceState *dev) -{ - KVMS390FLICState *flic = KVM_S390_FLIC(dev); - struct kvm_device_attr attr = { - .group = KVM_DEV_FLIC_CLEAR_IRQS, - }; - int rc = 0; - - if (flic->fd == -1) { - return; - } - - flic_disable_wait_pfault(flic); - - rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr); - if (rc) { - trace_flic_reset_failed(errno); - } - - flic_enable_pfault(flic); -} - -static void kvm_s390_flic_class_init(ObjectClass *oc, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(oc); - S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc); - - dc->realize = kvm_s390_flic_realize; - dc->unrealize = kvm_s390_flic_unrealize; - dc->reset = kvm_s390_flic_reset; - fsc->register_io_adapter = kvm_s390_register_io_adapter; - fsc->io_adapter_map = kvm_s390_io_adapter_map; - fsc->add_adapter_routes = kvm_s390_add_adapter_routes; - fsc->release_adapter_routes = kvm_s390_release_adapter_routes; -} - -static const TypeInfo kvm_s390_flic_info = { - .name = TYPE_KVM_S390_FLIC, - .parent = TYPE_S390_FLIC_COMMON, - .instance_size = sizeof(KVMS390FLICState), - .class_init = kvm_s390_flic_class_init, -}; - -static void kvm_s390_flic_register_types(void) -{ - type_register_static(&kvm_s390_flic_info); -} - -type_init(kvm_s390_flic_register_types) |