hw/s390x/s390-stattrib-kvm.c

   1 /*
   2  * s390 storage attributes device -- KVM object
   3  *
   4  * Copyright 2016 IBM Corp.
   5  * Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   8  * your option) any later version. See the COPYING file in the top-level
   9  * directory.
  10  */
  11
  12 #include "qemu/osdep.h"
  13 #include "hw/boards.h"
  14 #include "migration/qemu-file.h"
  15 #include "hw/s390x/storage-attributes.h"
  16 #include "qemu/error-report.h"
  17 #include "sysemu/kvm.h"
  18 #include "exec/ram_addr.h"
  19 #include "kvm/kvm_s390x.h"
  20
  21 Object *kvm_s390_stattrib_create(void)
  22 {
  23     if (kvm_enabled() &&
  24                 kvm_check_extension(kvm_state, KVM_CAP_S390_CMMA_MIGRATION)) {
  25         return object_new(TYPE_KVM_S390_STATTRIB);
  26     }
  27     return NULL;
  28 }
  29
  30 static void kvm_s390_stattrib_instance_init(Object *obj)
  31 {
  32     KVMS390StAttribState *sas = KVM_S390_STATTRIB(obj);
  33
  34     sas->still_dirty = 0;
  35 }
  36
  37 static int kvm_s390_stattrib_read_helper(S390StAttribState *sa,
  38                                          uint64_t *start_gfn,
  39                                          uint32_t count,
  40                                          uint8_t *values,
  41                                          uint32_t flags)
  42 {
  43     KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa);
  44     int r;
  45     struct kvm_s390_cmma_log clog = {
  46         .values = (uint64_t)values,
  47         .start_gfn = *start_gfn,
  48         .count = count,
  49         .flags = flags,
  50     };
  51
  52     r = kvm_vm_ioctl(kvm_state, KVM_S390_GET_CMMA_BITS, &clog);
  53     if (r < 0) {
  54         error_report("KVM_S390_GET_CMMA_BITS failed: %s", strerror(-r));
  55         return r;
  56     }
  57
  58     *start_gfn = clog.start_gfn;
  59     sas->still_dirty = clog.remaining;
  60     return clog.count;
  61 }
  62
  63 static int kvm_s390_stattrib_get_stattr(S390StAttribState *sa,
  64                                         uint64_t *start_gfn,
  65                                         uint32_t count,
  66                                         uint8_t *values)
  67 {
  68     return kvm_s390_stattrib_read_helper(sa, start_gfn, count, values, 0);
  69 }
  70
  71 static int kvm_s390_stattrib_peek_stattr(S390StAttribState *sa,
  72                                          uint64_t start_gfn,
  73                                          uint32_t count,
  74                                          uint8_t *values)
  75 {
  76     return kvm_s390_stattrib_read_helper(sa, &start_gfn, count, values,
  77                                          KVM_S390_CMMA_PEEK);
  78 }
  79
  80 static int kvm_s390_stattrib_set_stattr(S390StAttribState *sa,
  81                                         uint64_t start_gfn,
  82                                         uint32_t count,
  83                                         uint8_t *values)
  84 {
  85     KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa);
  86     MachineState *machine = MACHINE(qdev_get_machine());
  87     unsigned long max = machine->ram_size / TARGET_PAGE_SIZE;
  88
  89     if (start_gfn + count > max) {
  90         error_report("Out of memory bounds when setting storage attributes");
  91         return -1;
  92     }
  93     if (!sas->incoming_buffer) {
  94         sas->incoming_buffer = g_malloc0(max);
  95     }
  96
  97     memcpy(sas->incoming_buffer + start_gfn, values, count);
  98
  99     return 0;
 100 }
 101
 102 static void kvm_s390_stattrib_synchronize(S390StAttribState *sa)
 103 {
 104     KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa);
 105     MachineState *machine = MACHINE(qdev_get_machine());
 106     unsigned long max = machine->ram_size / TARGET_PAGE_SIZE;
 107     /* We do not need to reach the maximum buffer size allowed */
 108     unsigned long cx, len = KVM_S390_SKEYS_MAX / 2;
 109     int r;
 110     struct kvm_s390_cmma_log clog = {
 111         .flags = 0,
 112         .mask = ~0ULL,
 113     };
 114
 115     if (sas->incoming_buffer) {
 116         for (cx = 0; cx + len <= max; cx += len) {
 117             clog.start_gfn = cx;
 118             clog.count = len;
 119             clog.values = (uint64_t)(sas->incoming_buffer + cx);
 120             r = kvm_vm_ioctl(kvm_state, KVM_S390_SET_CMMA_BITS, &clog);
 121             if (r) {
 122                 error_report("KVM_S390_SET_CMMA_BITS failed: %s", strerror(-r));
 123                 return;
 124             }
 125         }
 126         if (cx < max) {
 127             clog.start_gfn = cx;
 128             clog.count = max - cx;
 129             clog.values = (uint64_t)(sas->incoming_buffer + cx);
 130             r = kvm_vm_ioctl(kvm_state, KVM_S390_SET_CMMA_BITS, &clog);
 131             if (r) {
 132                 error_report("KVM_S390_SET_CMMA_BITS failed: %s", strerror(-r));
 133             }
 134         }
 135         g_free(sas->incoming_buffer);
 136         sas->incoming_buffer = NULL;
 137     }
 138 }
 139
 140 static int kvm_s390_stattrib_set_migrationmode(S390StAttribState *sa, bool val)
 141 {
 142     struct kvm_device_attr attr = {
 143         .group = KVM_S390_VM_MIGRATION,
 144         .attr = val,
 145         .addr = 0,
 146     };
 147     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 148 }
 149
 150 static long long kvm_s390_stattrib_get_dirtycount(S390StAttribState *sa)
 151 {
 152     KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa);
 153     uint8_t val[8];
 154
 155     kvm_s390_stattrib_peek_stattr(sa, 0, 1, val);
 156     return sas->still_dirty;
 157 }
 158
 159 static int kvm_s390_stattrib_get_active(S390StAttribState *sa)
 160 {
 161     return kvm_s390_cmma_active() && sa->migration_enabled;
 162 }
 163
 164 static void kvm_s390_stattrib_class_init(ObjectClass *oc, void *data)
 165 {
 166     S390StAttribClass *sac = S390_STATTRIB_CLASS(oc);
 167     DeviceClass *dc = DEVICE_CLASS(oc);
 168
 169     sac->get_stattr = kvm_s390_stattrib_get_stattr;
 170     sac->peek_stattr = kvm_s390_stattrib_peek_stattr;
 171     sac->set_stattr = kvm_s390_stattrib_set_stattr;
 172     sac->set_migrationmode = kvm_s390_stattrib_set_migrationmode;
 173     sac->get_dirtycount = kvm_s390_stattrib_get_dirtycount;
 174     sac->synchronize = kvm_s390_stattrib_synchronize;
 175     sac->get_active = kvm_s390_stattrib_get_active;
 176
 177     /* Reason: Can only be instantiated one time (internally) */
 178     dc->user_creatable = false;
 179 }
 180
 181 static const TypeInfo kvm_s390_stattrib_info = {
 182     .name          = TYPE_KVM_S390_STATTRIB,
 183     .parent        = TYPE_S390_STATTRIB,
 184     .instance_init = kvm_s390_stattrib_instance_init,
 185     .instance_size = sizeof(KVMS390StAttribState),
 186     .class_init    = kvm_s390_stattrib_class_init,
 187     .class_size    = sizeof(S390StAttribClass),
 188 };
 189
 190 static void kvm_s390_stattrib_register_types(void)
 191 {
 192     type_register_static(&kvm_s390_stattrib_info);
 193 }
 194
 195 type_init(kvm_s390_stattrib_register_types)