Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20220120-1' into...
[qemu.git] / 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)