diff options
Diffstat (limited to 'hw/s390x/s390-stattrib-kvm.c')
| -rw-r--r-- | hw/s390x/s390-stattrib-kvm.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/hw/s390x/s390-stattrib-kvm.c b/hw/s390x/s390-stattrib-kvm.c new file mode 100644 index 000000000..24cd01382 --- /dev/null +++ b/hw/s390x/s390-stattrib-kvm.c @@ -0,0 +1,195 @@ +/* + * s390 storage attributes device -- KVM object + * + * Copyright 2016 IBM Corp. + * Author(s): Claudio Imbrenda <imbrenda@linux.vnet.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 "hw/boards.h" +#include "migration/qemu-file.h" +#include "hw/s390x/storage-attributes.h" +#include "qemu/error-report.h" +#include "sysemu/kvm.h" +#include "exec/ram_addr.h" +#include "kvm/kvm_s390x.h" + +Object *kvm_s390_stattrib_create(void) +{ + if (kvm_enabled() && + kvm_check_extension(kvm_state, KVM_CAP_S390_CMMA_MIGRATION)) { + return object_new(TYPE_KVM_S390_STATTRIB); + } + return NULL; +} + +static void kvm_s390_stattrib_instance_init(Object *obj) +{ + KVMS390StAttribState *sas = KVM_S390_STATTRIB(obj); + + sas->still_dirty = 0; +} + +static int kvm_s390_stattrib_read_helper(S390StAttribState *sa, + uint64_t *start_gfn, + uint32_t count, + uint8_t *values, + uint32_t flags) +{ + KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa); + int r; + struct kvm_s390_cmma_log clog = { + .values = (uint64_t)values, + .start_gfn = *start_gfn, + .count = count, + .flags = flags, + }; + + r = kvm_vm_ioctl(kvm_state, KVM_S390_GET_CMMA_BITS, &clog); + if (r < 0) { + error_report("KVM_S390_GET_CMMA_BITS failed: %s", strerror(-r)); + return r; + } + + *start_gfn = clog.start_gfn; + sas->still_dirty = clog.remaining; + return clog.count; +} + +static int kvm_s390_stattrib_get_stattr(S390StAttribState *sa, + uint64_t *start_gfn, + uint32_t count, + uint8_t *values) +{ + return kvm_s390_stattrib_read_helper(sa, start_gfn, count, values, 0); +} + +static int kvm_s390_stattrib_peek_stattr(S390StAttribState *sa, + uint64_t start_gfn, + uint32_t count, + uint8_t *values) +{ + return kvm_s390_stattrib_read_helper(sa, &start_gfn, count, values, + KVM_S390_CMMA_PEEK); +} + +static int kvm_s390_stattrib_set_stattr(S390StAttribState *sa, + uint64_t start_gfn, + uint32_t count, + uint8_t *values) +{ + KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa); + MachineState *machine = MACHINE(qdev_get_machine()); + unsigned long max = machine->ram_size / TARGET_PAGE_SIZE; + + if (start_gfn + count > max) { + error_report("Out of memory bounds when setting storage attributes"); + return -1; + } + if (!sas->incoming_buffer) { + sas->incoming_buffer = g_malloc0(max); + } + + memcpy(sas->incoming_buffer + start_gfn, values, count); + + return 0; +} + +static void kvm_s390_stattrib_synchronize(S390StAttribState *sa) +{ + KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa); + MachineState *machine = MACHINE(qdev_get_machine()); + unsigned long max = machine->ram_size / TARGET_PAGE_SIZE; + /* We do not need to reach the maximum buffer size allowed */ + unsigned long cx, len = KVM_S390_SKEYS_MAX / 2; + int r; + struct kvm_s390_cmma_log clog = { + .flags = 0, + .mask = ~0ULL, + }; + + if (sas->incoming_buffer) { + for (cx = 0; cx + len <= max; cx += len) { + clog.start_gfn = cx; + clog.count = len; + clog.values = (uint64_t)(sas->incoming_buffer + cx); + r = kvm_vm_ioctl(kvm_state, KVM_S390_SET_CMMA_BITS, &clog); + if (r) { + error_report("KVM_S390_SET_CMMA_BITS failed: %s", strerror(-r)); + return; + } + } + if (cx < max) { + clog.start_gfn = cx; + clog.count = max - cx; + clog.values = (uint64_t)(sas->incoming_buffer + cx); + r = kvm_vm_ioctl(kvm_state, KVM_S390_SET_CMMA_BITS, &clog); + if (r) { + error_report("KVM_S390_SET_CMMA_BITS failed: %s", strerror(-r)); + } + } + g_free(sas->incoming_buffer); + sas->incoming_buffer = NULL; + } +} + +static int kvm_s390_stattrib_set_migrationmode(S390StAttribState *sa, bool val) +{ + struct kvm_device_attr attr = { + .group = KVM_S390_VM_MIGRATION, + .attr = val, + .addr = 0, + }; + return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr); +} + +static long long kvm_s390_stattrib_get_dirtycount(S390StAttribState *sa) +{ + KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa); + uint8_t val[8]; + + kvm_s390_stattrib_peek_stattr(sa, 0, 1, val); + return sas->still_dirty; +} + +static int kvm_s390_stattrib_get_active(S390StAttribState *sa) +{ + return kvm_s390_cmma_active() && sa->migration_enabled; +} + +static void kvm_s390_stattrib_class_init(ObjectClass *oc, void *data) +{ + S390StAttribClass *sac = S390_STATTRIB_CLASS(oc); + DeviceClass *dc = DEVICE_CLASS(oc); + + sac->get_stattr = kvm_s390_stattrib_get_stattr; + sac->peek_stattr = kvm_s390_stattrib_peek_stattr; + sac->set_stattr = kvm_s390_stattrib_set_stattr; + sac->set_migrationmode = kvm_s390_stattrib_set_migrationmode; + sac->get_dirtycount = kvm_s390_stattrib_get_dirtycount; + sac->synchronize = kvm_s390_stattrib_synchronize; + sac->get_active = kvm_s390_stattrib_get_active; + + /* Reason: Can only be instantiated one time (internally) */ + dc->user_creatable = false; +} + +static const TypeInfo kvm_s390_stattrib_info = { + .name = TYPE_KVM_S390_STATTRIB, + .parent = TYPE_S390_STATTRIB, + .instance_init = kvm_s390_stattrib_instance_init, + .instance_size = sizeof(KVMS390StAttribState), + .class_init = kvm_s390_stattrib_class_init, + .class_size = sizeof(S390StAttribClass), +}; + +static void kvm_s390_stattrib_register_types(void) +{ + type_register_static(&kvm_s390_stattrib_info); +} + +type_init(kvm_s390_stattrib_register_types) |