xref: /openbmc/qemu/target/s390x/cpu_features.c (revision 6e55b32d)
1 /*
2  * CPU features/facilities for s390x
3  *
4  * Copyright IBM Corp. 2016, 2018
5  * Copyright Red Hat, Inc. 2019
6  *
7  * Author(s): David Hildenbrand <david@redhat.com>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2 or (at
10  * your option) any later version. See the COPYING file in the top-level
11  * directory.
12  */
13 
14 #include "qemu/osdep.h"
15 #include "qemu/module.h"
16 #include "cpu_features.h"
17 #ifndef CONFIG_USER_ONLY
18 #include "target/s390x/kvm/pv.h"
19 #endif
20 
21 #define DEF_FEAT(_FEAT, _NAME, _TYPE, _BIT, _DESC) \
22     [S390_FEAT_##_FEAT] = {                        \
23         .name = _NAME,                             \
24         .type = S390_FEAT_TYPE_##_TYPE,            \
25         .bit = _BIT,                               \
26         .desc = _DESC,                             \
27     },
28 static const S390FeatDef s390_features[S390_FEAT_MAX] = {
29     #include "cpu_features_def.h.inc"
30 };
31 #undef DEF_FEAT
32 
s390_feat_def(S390Feat feat)33 const S390FeatDef *s390_feat_def(S390Feat feat)
34 {
35     return &s390_features[feat];
36 }
37 
s390_feat_by_type_and_bit(S390FeatType type,int bit)38 S390Feat s390_feat_by_type_and_bit(S390FeatType type, int bit)
39 {
40     S390Feat feat;
41 
42     for (feat = 0; feat < ARRAY_SIZE(s390_features); feat++) {
43         if (s390_features[feat].type == type &&
44             s390_features[feat].bit == bit) {
45             return feat;
46         }
47     }
48     return S390_FEAT_MAX;
49 }
50 
s390_init_feat_bitmap(const S390FeatInit init,S390FeatBitmap bitmap)51 void s390_init_feat_bitmap(const S390FeatInit init, S390FeatBitmap bitmap)
52 {
53     int i, j;
54 
55     for (i = 0; i < (S390_FEAT_MAX / 64 + 1); i++) {
56         if (init[i]) {
57             for (j = 0; j < 64; j++) {
58                 if (init[i] & 1ULL << j) {
59                     set_bit(i * 64 + j, bitmap);
60                 }
61             }
62         }
63     }
64 }
65 
s390_fill_feat_block(const S390FeatBitmap features,S390FeatType type,uint8_t * data)66 void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
67                           uint8_t *data)
68 {
69     S390Feat feat;
70     int bit_nr;
71 
72     switch (type) {
73     case S390_FEAT_TYPE_STFL:
74         if (test_bit(S390_FEAT_ZARCH, features)) {
75             /* Features that are always active */
76             set_be_bit(2, data);   /* z/Architecture */
77             set_be_bit(138, data); /* Configuration-z-architectural-mode */
78         }
79         break;
80     case S390_FEAT_TYPE_PTFF:
81     case S390_FEAT_TYPE_KMAC:
82     case S390_FEAT_TYPE_KMC:
83     case S390_FEAT_TYPE_KM:
84     case S390_FEAT_TYPE_KIMD:
85     case S390_FEAT_TYPE_KLMD:
86     case S390_FEAT_TYPE_PCKMO:
87     case S390_FEAT_TYPE_KMCTR:
88     case S390_FEAT_TYPE_KMF:
89     case S390_FEAT_TYPE_KMO:
90     case S390_FEAT_TYPE_PCC:
91     case S390_FEAT_TYPE_PPNO:
92     case S390_FEAT_TYPE_KMA:
93     case S390_FEAT_TYPE_KDSA:
94     case S390_FEAT_TYPE_SORTL:
95     case S390_FEAT_TYPE_DFLTCC:
96         set_be_bit(0, data); /* query is always available */
97         break;
98     default:
99         break;
100     };
101 
102     feat = find_first_bit(features, S390_FEAT_MAX);
103     while (feat < S390_FEAT_MAX) {
104         if (s390_features[feat].type == type) {
105             bit_nr = s390_features[feat].bit;
106             /* big endian on uint8_t array */
107             set_be_bit(bit_nr, data);
108         }
109         feat = find_next_bit(features, S390_FEAT_MAX, feat + 1);
110     }
111 
112 #ifndef CONFIG_USER_ONLY
113     if (!s390_is_pv()) {
114         return;
115     }
116 
117     /*
118      * Some facilities are not available for CPUs in protected mode:
119      * - All SIE facilities because SIE is not available
120      * - DIAG318
121      *
122      * As VMs can move in and out of protected mode the CPU model
123      * doesn't protect us from that problem because it is only
124      * validated at the start of the VM.
125      */
126     switch (type) {
127     case S390_FEAT_TYPE_SCLP_CPU:
128         clear_be_bit(s390_feat_def(S390_FEAT_SIE_F2)->bit, data);
129         clear_be_bit(s390_feat_def(S390_FEAT_SIE_SKEY)->bit, data);
130         clear_be_bit(s390_feat_def(S390_FEAT_SIE_GPERE)->bit, data);
131         clear_be_bit(s390_feat_def(S390_FEAT_SIE_SIIF)->bit, data);
132         clear_be_bit(s390_feat_def(S390_FEAT_SIE_SIGPIF)->bit, data);
133         clear_be_bit(s390_feat_def(S390_FEAT_SIE_IB)->bit, data);
134         clear_be_bit(s390_feat_def(S390_FEAT_SIE_CEI)->bit, data);
135         break;
136     case S390_FEAT_TYPE_SCLP_CONF_CHAR:
137         clear_be_bit(s390_feat_def(S390_FEAT_SIE_GSLS)->bit, data);
138         clear_be_bit(s390_feat_def(S390_FEAT_HPMA2)->bit, data);
139         clear_be_bit(s390_feat_def(S390_FEAT_SIE_KSS)->bit, data);
140         break;
141     case S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT:
142         clear_be_bit(s390_feat_def(S390_FEAT_SIE_64BSCAO)->bit, data);
143         clear_be_bit(s390_feat_def(S390_FEAT_SIE_CMMA)->bit, data);
144         clear_be_bit(s390_feat_def(S390_FEAT_SIE_PFMFI)->bit, data);
145         clear_be_bit(s390_feat_def(S390_FEAT_SIE_IBS)->bit, data);
146         break;
147     case S390_FEAT_TYPE_SCLP_FAC134:
148         clear_be_bit(s390_feat_def(S390_FEAT_DIAG_318)->bit, data);
149         break;
150     default:
151         return;
152     }
153 #endif
154 }
155 
s390_add_from_feat_block(S390FeatBitmap features,S390FeatType type,uint8_t * data)156 void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
157                               uint8_t *data)
158 {
159     int nr_bits, le_bit;
160 
161     switch (type) {
162     case S390_FEAT_TYPE_STFL:
163        nr_bits = 16384;
164        break;
165     case S390_FEAT_TYPE_PLO:
166     case S390_FEAT_TYPE_SORTL:
167     case S390_FEAT_TYPE_DFLTCC:
168        nr_bits = 256;
169        break;
170     default:
171        /* all cpu subfunctions have 128 bit */
172        nr_bits = 128;
173     };
174 
175     le_bit = find_first_bit((unsigned long *) data, nr_bits);
176     while (le_bit < nr_bits) {
177         /* convert the bit number to a big endian bit nr */
178         S390Feat feat = s390_feat_by_type_and_bit(type, BE_BIT_NR(le_bit));
179         /* ignore unknown bits */
180         if (feat < S390_FEAT_MAX) {
181             set_bit(feat, features);
182         }
183         le_bit = find_next_bit((unsigned long *) data, nr_bits, le_bit + 1);
184     }
185 }
186 
s390_feat_bitmap_to_ascii(const S390FeatBitmap features,void * opaque,void (* fn)(const char * name,void * opaque))187 void s390_feat_bitmap_to_ascii(const S390FeatBitmap features, void *opaque,
188                                void (*fn)(const char *name, void *opaque))
189 {
190     S390FeatBitmap bitmap, tmp;
191     S390FeatGroup group;
192     S390Feat feat;
193 
194     bitmap_copy(bitmap, features, S390_FEAT_MAX);
195 
196     /* process whole groups first */
197     for (group = 0; group < S390_FEAT_GROUP_MAX; group++) {
198         const S390FeatGroupDef *def = s390_feat_group_def(group);
199 
200         bitmap_and(tmp, bitmap, def->feat, S390_FEAT_MAX);
201         if (bitmap_equal(tmp, def->feat, S390_FEAT_MAX)) {
202             bitmap_andnot(bitmap, bitmap, def->feat, S390_FEAT_MAX);
203             fn(def->name, opaque);
204         }
205     }
206 
207     /* report leftovers as separate features */
208     feat = find_first_bit(bitmap, S390_FEAT_MAX);
209     while (feat < S390_FEAT_MAX) {
210         fn(s390_feat_def(feat)->name, opaque);
211         feat = find_next_bit(bitmap, S390_FEAT_MAX, feat + 1);
212     };
213 }
214 
s390_get_deprecated_features(S390FeatBitmap features)215 void s390_get_deprecated_features(S390FeatBitmap features)
216 {
217     static const int feats[] = {
218          /* CSSKE is deprecated on newer generations */
219          S390_FEAT_CONDITIONAL_SSKE,
220          S390_FEAT_BPB,
221          /* Deprecated on z16 */
222          S390_FEAT_CONSTRAINT_TRANSACTIONAL_EXE,
223          S390_FEAT_TRANSACTIONAL_EXE
224     };
225     int i;
226 
227     for (i = 0; i < ARRAY_SIZE(feats); i++) {
228         set_bit(feats[i], features);
229     }
230 }
231 
232 #define FEAT_GROUP_INIT(_name, _group, _desc)        \
233     {                                                \
234         .name = _name,                               \
235         .desc = _desc,                               \
236         .init = { S390_FEAT_GROUP_LIST_ ## _group }, \
237     }
238 
239 /* indexed by feature group number for easy lookup */
240 static S390FeatGroupDef s390_feature_groups[] = {
241     FEAT_GROUP_INIT("plo", PLO, "Perform-locked-operation facility"),
242     FEAT_GROUP_INIT("tods", TOD_CLOCK_STEERING, "Tod-clock-steering facility"),
243     FEAT_GROUP_INIT("gen13ptff", GEN13_PTFF, "PTFF enhancements introduced with z13"),
244     FEAT_GROUP_INIT("msa", MSA, "Message-security-assist facility"),
245     FEAT_GROUP_INIT("msa1", MSA_EXT_1, "Message-security-assist-extension 1 facility"),
246     FEAT_GROUP_INIT("msa2", MSA_EXT_2, "Message-security-assist-extension 2 facility"),
247     FEAT_GROUP_INIT("msa3", MSA_EXT_3, "Message-security-assist-extension 3 facility"),
248     FEAT_GROUP_INIT("msa4", MSA_EXT_4, "Message-security-assist-extension 4 facility"),
249     FEAT_GROUP_INIT("msa5", MSA_EXT_5, "Message-security-assist-extension 5 facility"),
250     FEAT_GROUP_INIT("msa6", MSA_EXT_6, "Message-security-assist-extension 6 facility"),
251     FEAT_GROUP_INIT("msa7", MSA_EXT_7, "Message-security-assist-extension 7 facility"),
252     FEAT_GROUP_INIT("msa8", MSA_EXT_8, "Message-security-assist-extension 8 facility"),
253     FEAT_GROUP_INIT("msa9", MSA_EXT_9, "Message-security-assist-extension 9 facility"),
254     FEAT_GROUP_INIT("msa9_pckmo", MSA_EXT_9_PCKMO, "Message-security-assist-extension 9 PCKMO subfunctions"),
255     FEAT_GROUP_INIT("mepochptff", MULTIPLE_EPOCH_PTFF, "PTFF enhancements introduced with Multiple-epoch facility"),
256     FEAT_GROUP_INIT("esort", ENH_SORT, "Enhanced-sort facility"),
257     FEAT_GROUP_INIT("deflate", DEFLATE_CONVERSION, "Deflate-conversion facility"),
258 };
259 
s390_feat_group_def(S390FeatGroup group)260 const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group)
261 {
262     return &s390_feature_groups[group];
263 }
264 
init_groups(void)265 static void init_groups(void)
266 {
267     int i;
268 
269     /* init all bitmaps from generated data initially */
270     for (i = 0; i < ARRAY_SIZE(s390_feature_groups); i++) {
271         s390_init_feat_bitmap(s390_feature_groups[i].init,
272                               s390_feature_groups[i].feat);
273     }
274 }
275 
276 type_init(init_groups)
277