/*
- * QEMU S390x KVM floating interrupt controller (flic)
+ * QEMU S390x 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 <sys/ioctl.h>
+#include "qemu/osdep.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 "trace.h"
-#define FLIC_SAVE_INITIAL_SIZE getpagesize()
-#define FLIC_FAILED (-1UL)
-#define FLIC_SAVEVM_VERSION 1
-
-void s390_flic_init(void)
+S390FLICState *s390_get_flic(void)
{
- DeviceState *dev;
- int r;
+ S390FLICState *fs;
- if (kvm_enabled()) {
- dev = qdev_create(NULL, "s390-flic");
- object_property_add_child(qdev_get_machine(), "s390-flic",
- OBJECT(dev), NULL);
- r = qdev_init(dev);
- if (r) {
- error_report("flic: couldn't create qdev");
- }
+ fs = S390_FLIC_COMMON(object_resolve_path(TYPE_KVM_S390_FLIC, NULL));
+ if (!fs) {
+ fs = S390_FLIC_COMMON(object_resolve_path(TYPE_QEMU_S390_FLIC, NULL));
}
+ return fs;
}
-/**
- * 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)
+void s390_flic_init(void)
{
- struct kvm_device_attr attr = {
- .group = KVM_DEV_FLIC_APF_ENABLE,
- };
- int rc;
-
- rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
+ DeviceState *dev;
- if (rc) {
- fprintf(stderr, "flic: couldn't enable pfault\n");
+ dev = s390_flic_kvm_create();
+ if (!dev) {
+ dev = qdev_create(NULL, TYPE_QEMU_S390_FLIC);
+ object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
+ OBJECT(dev), NULL);
}
+ qdev_init_nofail(dev);
}
-static void flic_disable_wait_pfault(KVMS390FLICState *flic)
+static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
+ uint8_t isc, bool swap,
+ bool is_maskable)
{
- 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");
- }
+ /* nothing to do */
+ return 0;
}
-/** 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)
+static int qemu_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
+ uint64_t map_addr, bool do_map)
{
- 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;
+ /* nothing to do */
+ return 0;
}
-/**
- * __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)
+static int qemu_s390_add_adapter_routes(S390FLICState *fs,
+ AdapterRoutes *routes)
{
- 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;
+ return -ENOSYS;
}
-/**
- * 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)
+static void qemu_s390_release_adapter_routes(S390FLICState *fs,
+ AdapterRoutes *routes)
{
- 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)
+static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
{
- uint64_t len = 0;
- uint64_t count = 0;
- void *buf = NULL;
- int r = 0;
+ S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);
- 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;
+ fsc->register_io_adapter = qemu_s390_register_io_adapter;
+ fsc->io_adapter_map = qemu_s390_io_adapter_map;
+ fsc->add_adapter_routes = qemu_s390_add_adapter_routes;
+ fsc->release_adapter_routes = qemu_s390_release_adapter_routes;
}
-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);
-
- dc->realize = kvm_s390_flic_realize;
- dc->unrealize = kvm_s390_flic_unrealize;
- dc->reset = kvm_s390_flic_reset;
-}
+static const TypeInfo qemu_s390_flic_info = {
+ .name = TYPE_QEMU_S390_FLIC,
+ .parent = TYPE_S390_FLIC_COMMON,
+ .instance_size = sizeof(QEMUS390FLICState),
+ .class_init = qemu_s390_flic_class_init,
+};
-static const TypeInfo kvm_s390_flic_info = {
- .name = TYPE_KVM_S390_FLIC,
+static const TypeInfo s390_flic_common_info = {
+ .name = TYPE_S390_FLIC_COMMON,
.parent = TYPE_SYS_BUS_DEVICE,
- .instance_size = sizeof(KVMS390FLICState),
- .class_init = kvm_s390_flic_class_init,
+ .instance_size = sizeof(S390FLICState),
+ .class_size = sizeof(S390FLICStateClass),
};
-static void kvm_s390_flic_register_types(void)
+static void qemu_s390_flic_register_types(void)
{
- type_register_static(&kvm_s390_flic_info);
+ type_register_static(&s390_flic_common_info);
+ type_register_static(&qemu_s390_flic_info);
}
-type_init(kvm_s390_flic_register_types)
+type_init(qemu_s390_flic_register_types)
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