xref: /qemu/tests/qtest/arm-cpu-features.c (revision 83ecdb18)
1 /*
2  * Arm CPU feature test cases
3  *
4  * Copyright (c) 2019 Red Hat Inc.
5  * Authors:
6  *  Andrew Jones <drjones@redhat.com>
7  *
8  * This work is licensed under the terms of the GNU GPL, version 2 or later.
9  * See the COPYING file in the top-level directory.
10  */
11 #include "qemu/osdep.h"
12 #include "qemu/bitops.h"
13 #include "libqtest.h"
14 #include "qapi/qmp/qdict.h"
15 #include "qapi/qmp/qjson.h"
16 
17 /*
18  * We expect the SVE max-vq to be 16. Also it must be <= 64
19  * for our test code, otherwise 'vls' can't just be a uint64_t.
20  */
21 #define SVE_MAX_VQ 16
22 
23 #define MACHINE     "-machine virt,gic-version=max -accel tcg "
24 #define MACHINE_KVM "-machine virt,gic-version=max -accel kvm "
25 #define QUERY_HEAD  "{ 'execute': 'query-cpu-model-expansion', " \
26                     "  'arguments': { 'type': 'full', "
27 #define QUERY_TAIL  "}}"
28 
29 static QDict *do_query_no_props(QTestState *qts, const char *cpu_type)
30 {
31     return qtest_qmp(qts, QUERY_HEAD "'model': { 'name': %s }"
32                           QUERY_TAIL, cpu_type);
33 }
34 
35 G_GNUC_PRINTF(3, 4)
36 static QDict *do_query(QTestState *qts, const char *cpu_type,
37                        const char *fmt, ...)
38 {
39     QDict *resp;
40 
41     if (fmt) {
42         QDict *args;
43         va_list ap;
44 
45         va_start(ap, fmt);
46         args = qdict_from_vjsonf_nofail(fmt, ap);
47         va_end(ap);
48 
49         resp = qtest_qmp(qts, QUERY_HEAD "'model': { 'name': %s, "
50                                                     "'props': %p }"
51                               QUERY_TAIL, cpu_type, args);
52     } else {
53         resp = do_query_no_props(qts, cpu_type);
54     }
55 
56     return resp;
57 }
58 
59 static const char *resp_get_error(QDict *resp)
60 {
61     QDict *qdict;
62 
63     g_assert(resp);
64 
65     qdict = qdict_get_qdict(resp, "error");
66     if (qdict) {
67         return qdict_get_str(qdict, "desc");
68     }
69 
70     return NULL;
71 }
72 
73 #define assert_error(qts, cpu_type, expected_error, fmt, ...)          \
74 ({                                                                     \
75     QDict *_resp;                                                      \
76     const char *_error;                                                \
77                                                                        \
78     _resp = do_query(qts, cpu_type, fmt, ##__VA_ARGS__);               \
79     g_assert(_resp);                                                   \
80     _error = resp_get_error(_resp);                                    \
81     g_assert(_error);                                                  \
82     g_assert(g_str_equal(_error, expected_error));                     \
83     qobject_unref(_resp);                                              \
84 })
85 
86 static bool resp_has_props(QDict *resp)
87 {
88     QDict *qdict;
89 
90     g_assert(resp);
91 
92     if (!qdict_haskey(resp, "return")) {
93         return false;
94     }
95     qdict = qdict_get_qdict(resp, "return");
96 
97     if (!qdict_haskey(qdict, "model")) {
98         return false;
99     }
100     qdict = qdict_get_qdict(qdict, "model");
101 
102     return qdict_haskey(qdict, "props");
103 }
104 
105 static QDict *resp_get_props(QDict *resp)
106 {
107     QDict *qdict;
108 
109     g_assert(resp);
110     g_assert(resp_has_props(resp));
111 
112     qdict = qdict_get_qdict(resp, "return");
113     qdict = qdict_get_qdict(qdict, "model");
114     qdict = qdict_get_qdict(qdict, "props");
115 
116     return qdict;
117 }
118 
119 static bool resp_get_feature(QDict *resp, const char *feature)
120 {
121     QDict *props;
122 
123     g_assert(resp);
124     g_assert(resp_has_props(resp));
125     props = resp_get_props(resp);
126     g_assert(qdict_get(props, feature));
127     return qdict_get_bool(props, feature);
128 }
129 
130 #define assert_has_feature(qts, cpu_type, feature)                     \
131 ({                                                                     \
132     QDict *_resp = do_query_no_props(qts, cpu_type);                   \
133     g_assert(_resp);                                                   \
134     g_assert(resp_has_props(_resp));                                   \
135     g_assert(qdict_get(resp_get_props(_resp), feature));               \
136     qobject_unref(_resp);                                              \
137 })
138 
139 #define assert_has_not_feature(qts, cpu_type, feature)                 \
140 ({                                                                     \
141     QDict *_resp = do_query_no_props(qts, cpu_type);                   \
142     g_assert(_resp);                                                   \
143     g_assert(!resp_has_props(_resp) ||                                 \
144              !qdict_get(resp_get_props(_resp), feature));              \
145     qobject_unref(_resp);                                              \
146 })
147 
148 #define resp_assert_feature(resp, feature, expected_value)             \
149 ({                                                                     \
150     QDict *_props;                                                     \
151                                                                        \
152     g_assert(_resp);                                                   \
153     g_assert(resp_has_props(_resp));                                   \
154     _props = resp_get_props(_resp);                                    \
155     g_assert(qdict_get(_props, feature));                              \
156     g_assert(qdict_get_bool(_props, feature) == (expected_value));     \
157 })
158 
159 #define assert_feature(qts, cpu_type, feature, expected_value)         \
160 ({                                                                     \
161     QDict *_resp;                                                      \
162                                                                        \
163     _resp = do_query_no_props(qts, cpu_type);                          \
164     g_assert(_resp);                                                   \
165     resp_assert_feature(_resp, feature, expected_value);               \
166     qobject_unref(_resp);                                              \
167 })
168 
169 #define assert_set_feature(qts, cpu_type, feature, value)              \
170 ({                                                                     \
171     const char *_fmt = (value) ? "{ %s: true }" : "{ %s: false }";     \
172     QDict *_resp;                                                      \
173                                                                        \
174     _resp = do_query(qts, cpu_type, _fmt, feature);                    \
175     g_assert(_resp);                                                   \
176     resp_assert_feature(_resp, feature, value);                        \
177     qobject_unref(_resp);                                              \
178 })
179 
180 #define assert_has_feature_enabled(qts, cpu_type, feature)             \
181     assert_feature(qts, cpu_type, feature, true)
182 
183 #define assert_has_feature_disabled(qts, cpu_type, feature)            \
184     assert_feature(qts, cpu_type, feature, false)
185 
186 static void assert_type_full(QTestState *qts)
187 {
188     const char *error;
189     QDict *resp;
190 
191     resp = qtest_qmp(qts, "{ 'execute': 'query-cpu-model-expansion', "
192                             "'arguments': { 'type': 'static', "
193                                            "'model': { 'name': 'foo' }}}");
194     g_assert(resp);
195     error = resp_get_error(resp);
196     g_assert(error);
197     g_assert(g_str_equal(error,
198                          "The requested expansion type is not supported"));
199     qobject_unref(resp);
200 }
201 
202 static void assert_bad_props(QTestState *qts, const char *cpu_type)
203 {
204     const char *error;
205     QDict *resp;
206 
207     resp = qtest_qmp(qts, "{ 'execute': 'query-cpu-model-expansion', "
208                             "'arguments': { 'type': 'full', "
209                                            "'model': { 'name': %s, "
210                                                       "'props': false }}}",
211                      cpu_type);
212     g_assert(resp);
213     error = resp_get_error(resp);
214     g_assert(error);
215     g_assert(g_str_equal(error,
216                          "Invalid parameter type for 'props', expected: dict"));
217     qobject_unref(resp);
218 }
219 
220 static uint64_t resp_get_sve_vls(QDict *resp)
221 {
222     QDict *props;
223     const QDictEntry *e;
224     uint64_t vls = 0;
225     int n = 0;
226 
227     g_assert(resp);
228     g_assert(resp_has_props(resp));
229 
230     props = resp_get_props(resp);
231 
232     for (e = qdict_first(props); e; e = qdict_next(props, e)) {
233         if (strlen(e->key) > 3 && !strncmp(e->key, "sve", 3) &&
234             g_ascii_isdigit(e->key[3])) {
235             char *endptr;
236             int bits;
237 
238             bits = g_ascii_strtoll(&e->key[3], &endptr, 10);
239             if (!bits || *endptr != '\0') {
240                 continue;
241             }
242 
243             if (qdict_get_bool(props, e->key)) {
244                 vls |= BIT_ULL((bits / 128) - 1);
245             }
246             ++n;
247         }
248     }
249 
250     g_assert(n == SVE_MAX_VQ);
251 
252     return vls;
253 }
254 
255 #define assert_sve_vls(qts, cpu_type, expected_vls, fmt, ...)          \
256 ({                                                                     \
257     QDict *_resp = do_query(qts, cpu_type, fmt, ##__VA_ARGS__);        \
258     g_assert(_resp);                                                   \
259     g_assert(resp_has_props(_resp));                                   \
260     g_assert(resp_get_sve_vls(_resp) == expected_vls);                 \
261     qobject_unref(_resp);                                              \
262 })
263 
264 static void sve_tests_default(QTestState *qts, const char *cpu_type)
265 {
266     /*
267      * With no sve-max-vq or sve<N> properties on the command line
268      * the default is to have all vector lengths enabled. This also
269      * tests that 'sve' is 'on' by default.
270      */
271     assert_sve_vls(qts, cpu_type, BIT_ULL(SVE_MAX_VQ) - 1, NULL);
272 
273     /* With SVE off, all vector lengths should also be off. */
274     assert_sve_vls(qts, cpu_type, 0, "{ 'sve': false }");
275 
276     /* With SVE on, we must have at least one vector length enabled. */
277     assert_error(qts, cpu_type, "cannot disable sve128", "{ 'sve128': false }");
278 
279     /* Basic enable/disable tests. */
280     assert_sve_vls(qts, cpu_type, 0x7, "{ 'sve384': true }");
281     assert_sve_vls(qts, cpu_type, ((BIT_ULL(SVE_MAX_VQ) - 1) & ~BIT_ULL(2)),
282                    "{ 'sve384': false }");
283 
284     /*
285      * ---------------------------------------------------------------------
286      *               power-of-two(vq)   all-power-            can      can
287      *                                  of-two(< vq)        enable   disable
288      * ---------------------------------------------------------------------
289      * vq < max_vq      no                MUST*              yes      yes
290      * vq < max_vq      yes               MUST*              yes      no
291      * ---------------------------------------------------------------------
292      * vq == max_vq     n/a               MUST*              yes**    yes**
293      * ---------------------------------------------------------------------
294      * vq > max_vq      n/a               no                 no       yes
295      * vq > max_vq      n/a               yes                yes      yes
296      * ---------------------------------------------------------------------
297      *
298      * [*] "MUST" means this requirement must already be satisfied,
299      *     otherwise 'max_vq' couldn't itself be enabled.
300      *
301      * [**] Not testable with the QMP interface, only with the command line.
302      */
303 
304     /* max_vq := 8 */
305     assert_sve_vls(qts, cpu_type, 0x8b, "{ 'sve1024': true }");
306 
307     /* max_vq := 8, vq < max_vq, !power-of-two(vq) */
308     assert_sve_vls(qts, cpu_type, 0x8f,
309                    "{ 'sve1024': true, 'sve384': true }");
310     assert_sve_vls(qts, cpu_type, 0x8b,
311                    "{ 'sve1024': true, 'sve384': false }");
312 
313     /* max_vq := 8, vq < max_vq, power-of-two(vq) */
314     assert_sve_vls(qts, cpu_type, 0x8b,
315                    "{ 'sve1024': true, 'sve256': true }");
316     assert_error(qts, cpu_type, "cannot disable sve256",
317                  "{ 'sve1024': true, 'sve256': false }");
318 
319     /* max_vq := 3, vq > max_vq, !all-power-of-two(< vq) */
320     assert_error(qts, cpu_type, "cannot disable sve512",
321                  "{ 'sve384': true, 'sve512': false, 'sve640': true }");
322 
323     /*
324      * We can disable power-of-two vector lengths when all larger lengths
325      * are also disabled. We only need to disable the power-of-two length,
326      * as all non-enabled larger lengths will then be auto-disabled.
327      */
328     assert_sve_vls(qts, cpu_type, 0x7, "{ 'sve512': false }");
329 
330     /* max_vq := 3, vq > max_vq, all-power-of-two(< vq) */
331     assert_sve_vls(qts, cpu_type, 0x1f,
332                    "{ 'sve384': true, 'sve512': true, 'sve640': true }");
333     assert_sve_vls(qts, cpu_type, 0xf,
334                    "{ 'sve384': true, 'sve512': true, 'sve640': false }");
335 }
336 
337 static void sve_tests_sve_max_vq_8(const void *data)
338 {
339     QTestState *qts;
340 
341     qts = qtest_init(MACHINE "-cpu max,sve-max-vq=8");
342 
343     assert_sve_vls(qts, "max", BIT_ULL(8) - 1, NULL);
344 
345     /*
346      * Disabling the max-vq set by sve-max-vq is not allowed, but
347      * of course enabling it is OK.
348      */
349     assert_error(qts, "max", "cannot disable sve1024", "{ 'sve1024': false }");
350     assert_sve_vls(qts, "max", 0xff, "{ 'sve1024': true }");
351 
352     /*
353      * Enabling anything larger than max-vq set by sve-max-vq is not
354      * allowed, but of course disabling everything larger is OK.
355      */
356     assert_error(qts, "max", "cannot enable sve1152", "{ 'sve1152': true }");
357     assert_sve_vls(qts, "max", 0xff, "{ 'sve1152': false }");
358 
359     /*
360      * We can enable/disable non power-of-two lengths smaller than the
361      * max-vq set by sve-max-vq, but, while we can enable power-of-two
362      * lengths, we can't disable them.
363      */
364     assert_sve_vls(qts, "max", 0xff, "{ 'sve384': true }");
365     assert_sve_vls(qts, "max", 0xfb, "{ 'sve384': false }");
366     assert_sve_vls(qts, "max", 0xff, "{ 'sve256': true }");
367     assert_error(qts, "max", "cannot disable sve256", "{ 'sve256': false }");
368 
369     qtest_quit(qts);
370 }
371 
372 static void sve_tests_sve_off(const void *data)
373 {
374     QTestState *qts;
375 
376     qts = qtest_init(MACHINE "-cpu max,sve=off");
377 
378     /* SVE is off, so the map should be empty. */
379     assert_sve_vls(qts, "max", 0, NULL);
380 
381     /* The map stays empty even if we turn lengths off. */
382     assert_sve_vls(qts, "max", 0, "{ 'sve128': false }");
383 
384     /* It's an error to enable lengths when SVE is off. */
385     assert_error(qts, "max", "cannot enable sve128", "{ 'sve128': true }");
386 
387     /* With SVE re-enabled we should get all vector lengths enabled. */
388     assert_sve_vls(qts, "max", BIT_ULL(SVE_MAX_VQ) - 1, "{ 'sve': true }");
389 
390     /* Or enable SVE with just specific vector lengths. */
391     assert_sve_vls(qts, "max", 0x3,
392                    "{ 'sve': true, 'sve128': true, 'sve256': true }");
393 
394     qtest_quit(qts);
395 }
396 
397 static void sve_tests_sve_off_kvm(const void *data)
398 {
399     QTestState *qts;
400 
401     qts = qtest_init(MACHINE_KVM "-cpu max,sve=off");
402 
403     /*
404      * We don't know if this host supports SVE so we don't
405      * attempt to test enabling anything. We only test that
406      * everything is disabled (as it should be with sve=off)
407      * and that using sve<N>=off to explicitly disable vector
408      * lengths is OK too.
409      */
410     assert_sve_vls(qts, "max", 0, NULL);
411     assert_sve_vls(qts, "max", 0, "{ 'sve128': false }");
412 
413     qtest_quit(qts);
414 }
415 
416 static void pauth_tests_default(QTestState *qts, const char *cpu_type)
417 {
418     assert_has_feature_enabled(qts, cpu_type, "pauth");
419     assert_has_feature_disabled(qts, cpu_type, "pauth-impdef");
420     assert_set_feature(qts, cpu_type, "pauth", false);
421     assert_set_feature(qts, cpu_type, "pauth", true);
422     assert_set_feature(qts, cpu_type, "pauth-impdef", true);
423     assert_set_feature(qts, cpu_type, "pauth-impdef", false);
424     assert_error(qts, cpu_type, "cannot enable pauth-impdef without pauth",
425                  "{ 'pauth': false, 'pauth-impdef': true }");
426 }
427 
428 static void test_query_cpu_model_expansion(const void *data)
429 {
430     QTestState *qts;
431 
432     qts = qtest_init(MACHINE "-cpu max");
433 
434     /* Test common query-cpu-model-expansion input validation */
435     assert_type_full(qts);
436     assert_bad_props(qts, "max");
437     assert_error(qts, "foo", "The CPU type 'foo' is not a recognized "
438                  "ARM CPU type", NULL);
439     assert_error(qts, "max", "Parameter 'not-a-prop' is unexpected",
440                  "{ 'not-a-prop': false }");
441     assert_error(qts, "host", "The CPU type 'host' requires KVM", NULL);
442 
443     /* Test expected feature presence/absence for some cpu types */
444     assert_has_feature_enabled(qts, "cortex-a15", "pmu");
445     assert_has_not_feature(qts, "cortex-a15", "aarch64");
446 
447     /* Enabling and disabling pmu should always work. */
448     assert_has_feature_enabled(qts, "max", "pmu");
449     assert_set_feature(qts, "max", "pmu", false);
450     assert_set_feature(qts, "max", "pmu", true);
451 
452     assert_has_not_feature(qts, "max", "kvm-no-adjvtime");
453     assert_has_not_feature(qts, "max", "kvm-steal-time");
454 
455     if (g_str_equal(qtest_get_arch(), "aarch64")) {
456         assert_has_feature_enabled(qts, "max", "aarch64");
457         assert_has_feature_enabled(qts, "max", "sve");
458         assert_has_feature_enabled(qts, "max", "sve128");
459         assert_has_feature_enabled(qts, "cortex-a57", "pmu");
460         assert_has_feature_enabled(qts, "cortex-a57", "aarch64");
461 
462         assert_has_feature_enabled(qts, "a64fx", "pmu");
463         assert_has_feature_enabled(qts, "a64fx", "aarch64");
464         /*
465          * A64FX does not support any other vector lengths besides those
466          * that are enabled by default(128bit, 256bits, 512bit).
467          */
468         assert_has_feature_enabled(qts, "a64fx", "sve");
469         assert_sve_vls(qts, "a64fx", 0xb, NULL);
470         assert_error(qts, "a64fx", "cannot enable sve384",
471                      "{ 'sve384': true }");
472         assert_error(qts, "a64fx", "cannot enable sve640",
473                      "{ 'sve640': true }");
474 
475         sve_tests_default(qts, "max");
476         pauth_tests_default(qts, "max");
477 
478         /* Test that features that depend on KVM generate errors without. */
479         assert_error(qts, "max",
480                      "'aarch64' feature cannot be disabled "
481                      "unless KVM is enabled and 32-bit EL1 "
482                      "is supported",
483                      "{ 'aarch64': false }");
484     }
485 
486     qtest_quit(qts);
487 }
488 
489 static void test_query_cpu_model_expansion_kvm(const void *data)
490 {
491     QTestState *qts;
492 
493     qts = qtest_init(MACHINE_KVM "-cpu max");
494 
495     /* Enabling and disabling kvm-no-adjvtime should always work. */
496     assert_has_feature_disabled(qts, "host", "kvm-no-adjvtime");
497     assert_set_feature(qts, "host", "kvm-no-adjvtime", true);
498     assert_set_feature(qts, "host", "kvm-no-adjvtime", false);
499 
500     if (g_str_equal(qtest_get_arch(), "aarch64")) {
501         bool kvm_supports_steal_time;
502         bool kvm_supports_sve;
503         char max_name[8], name[8];
504         uint32_t max_vq, vq;
505         uint64_t vls;
506         QDict *resp;
507         char *error;
508 
509         /*
510          * When using KVM, only the 'host' and 'max' CPU models are
511          * supported. Test that we're emitting a suitable error for
512          * unsupported CPU models.
513          */
514         if (qtest_has_accel("tcg")) {
515             assert_error(qts, "cortex-a7",
516                          "We cannot guarantee the CPU type 'cortex-a7' works "
517                          "with KVM on this host", NULL);
518         } else {
519             /*
520              * With a KVM-only build the 32-bit CPUs are not present.
521              */
522             assert_error(qts, "cortex-a7",
523                          "The CPU type 'cortex-a7' is not a "
524                          "recognized ARM CPU type", NULL);
525         }
526 
527         assert_has_feature_enabled(qts, "host", "aarch64");
528 
529         /* Enabling and disabling pmu should always work. */
530         assert_has_feature_enabled(qts, "host", "pmu");
531         assert_set_feature(qts, "host", "pmu", false);
532         assert_set_feature(qts, "host", "pmu", true);
533 
534         /*
535          * Some features would be enabled by default, but they're disabled
536          * because this instance of KVM doesn't support them. Test that the
537          * features are present, and, when enabled, issue further tests.
538          */
539         assert_has_feature(qts, "host", "kvm-steal-time");
540         assert_has_feature(qts, "host", "sve");
541 
542         resp = do_query_no_props(qts, "host");
543         kvm_supports_steal_time = resp_get_feature(resp, "kvm-steal-time");
544         kvm_supports_sve = resp_get_feature(resp, "sve");
545         vls = resp_get_sve_vls(resp);
546         qobject_unref(resp);
547 
548         if (kvm_supports_steal_time) {
549             /* If we have steal-time then we should be able to toggle it. */
550             assert_set_feature(qts, "host", "kvm-steal-time", false);
551             assert_set_feature(qts, "host", "kvm-steal-time", true);
552         }
553 
554         if (kvm_supports_sve) {
555             g_assert(vls != 0);
556             max_vq = 64 - __builtin_clzll(vls);
557             sprintf(max_name, "sve%u", max_vq * 128);
558 
559             /* Enabling a supported length is of course fine. */
560             assert_sve_vls(qts, "host", vls, "{ %s: true }", max_name);
561 
562             /* Get the next supported length smaller than max-vq. */
563             vq = 64 - __builtin_clzll(vls & ~BIT_ULL(max_vq - 1));
564             if (vq) {
565                 /*
566                  * We have at least one length smaller than max-vq,
567                  * so we can disable max-vq.
568                  */
569                 assert_sve_vls(qts, "host", (vls & ~BIT_ULL(max_vq - 1)),
570                                "{ %s: false }", max_name);
571 
572                 /*
573                  * Smaller, supported vector lengths cannot be disabled
574                  * unless all larger, supported vector lengths are also
575                  * disabled.
576                  */
577                 sprintf(name, "sve%u", vq * 128);
578                 error = g_strdup_printf("cannot disable %s", name);
579                 assert_error(qts, "host", error,
580                              "{ %s: true, %s: false }",
581                              max_name, name);
582                 g_free(error);
583             }
584 
585             /*
586              * The smallest, supported vector length is required, because
587              * we need at least one vector length enabled.
588              */
589             vq = __builtin_ffsll(vls);
590             sprintf(name, "sve%u", vq * 128);
591             error = g_strdup_printf("cannot disable %s", name);
592             assert_error(qts, "host", error, "{ %s: false }", name);
593             g_free(error);
594 
595             /* Get an unsupported length. */
596             for (vq = 1; vq <= max_vq; ++vq) {
597                 if (!(vls & BIT_ULL(vq - 1))) {
598                     break;
599                 }
600             }
601             if (vq <= SVE_MAX_VQ) {
602                 sprintf(name, "sve%u", vq * 128);
603                 error = g_strdup_printf("cannot enable %s", name);
604                 assert_error(qts, "host", error, "{ %s: true }", name);
605                 g_free(error);
606             }
607         } else {
608             g_assert(vls == 0);
609         }
610     } else {
611         assert_has_not_feature(qts, "host", "aarch64");
612         assert_has_not_feature(qts, "host", "pmu");
613         assert_has_not_feature(qts, "host", "sve");
614         assert_has_not_feature(qts, "host", "kvm-steal-time");
615     }
616 
617     qtest_quit(qts);
618 }
619 
620 int main(int argc, char **argv)
621 {
622     g_test_init(&argc, &argv, NULL);
623 
624     if (qtest_has_accel("tcg")) {
625         qtest_add_data_func("/arm/query-cpu-model-expansion",
626                             NULL, test_query_cpu_model_expansion);
627     }
628 
629     if (!g_str_equal(qtest_get_arch(), "aarch64")) {
630         goto out;
631     }
632 
633     /*
634      * For now we only run KVM specific tests with AArch64 QEMU in
635      * order avoid attempting to run an AArch32 QEMU with KVM on
636      * AArch64 hosts. That won't work and isn't easy to detect.
637      */
638     if (qtest_has_accel("kvm")) {
639         /*
640          * This tests target the 'host' CPU type, so register it only if
641          * KVM is available.
642          */
643         qtest_add_data_func("/arm/kvm/query-cpu-model-expansion",
644                             NULL, test_query_cpu_model_expansion_kvm);
645 
646         qtest_add_data_func("/arm/kvm/query-cpu-model-expansion/sve-off",
647                             NULL, sve_tests_sve_off_kvm);
648     }
649 
650     if (qtest_has_accel("tcg")) {
651         qtest_add_data_func("/arm/max/query-cpu-model-expansion/sve-max-vq-8",
652                             NULL, sve_tests_sve_max_vq_8);
653         qtest_add_data_func("/arm/max/query-cpu-model-expansion/sve-off",
654                             NULL, sve_tests_sve_off);
655     }
656 
657 out:
658     return g_test_run();
659 }
660