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qemu-e2k/tests/qtest/arm-cpu-features.c
Fabiano Rosas 557ed03a28 tests/qtest: Adjust and document query-cpu-model-expansion test for arm 
We're about to move the 32-bit CPUs under CONFIG_TCG, so adjust the
query-cpu-model-expansion test to check against the cortex-a7, which
is already under CONFIG_TCG. That allows the next patch to contain
only code movement. (All the test cares about is that the CPU type
it's checking is one which definitely doesn't work under KVM.)

While here add comments clarifying what we're testing.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
Acked-by: Thomas Huth <thuth@redhat.com>
Message-id: 20230426180013.14814-7-farosas@suse.de
Suggested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2023-05-02 10:21:32 +01:00

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/*
* Arm CPU feature test cases
*
* Copyright (c) 2019 Red Hat Inc.
* Authors:
* Andrew Jones <drjones@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/bitops.h"
#include "libqtest.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qjson.h"
/*
* We expect the SVE max-vq to be 16. Also it must be <= 64
* for our test code, otherwise 'vls' can't just be a uint64_t.
*/
#define SVE_MAX_VQ 16
#define MACHINE "-machine virt,gic-version=max -accel tcg "
#define MACHINE_KVM "-machine virt,gic-version=max -accel kvm "
#define QUERY_HEAD "{ 'execute': 'query-cpu-model-expansion', " \
" 'arguments': { 'type': 'full', "
#define QUERY_TAIL "}}"
static QDict *do_query_no_props(QTestState *qts, const char *cpu_type)
{
return qtest_qmp(qts, QUERY_HEAD "'model': { 'name': %s }"
QUERY_TAIL, cpu_type);
}
G_GNUC_PRINTF(3, 4)
static QDict *do_query(QTestState *qts, const char *cpu_type,
const char *fmt, ...)
{
QDict *resp;
if (fmt) {
QDict *args;
va_list ap;
va_start(ap, fmt);
args = qdict_from_vjsonf_nofail(fmt, ap);
va_end(ap);
resp = qtest_qmp(qts, QUERY_HEAD "'model': { 'name': %s, "
"'props': %p }"
QUERY_TAIL, cpu_type, args);
} else {
resp = do_query_no_props(qts, cpu_type);
}
return resp;
}
static const char *resp_get_error(QDict *resp)
{
QDict *qdict;
g_assert(resp);
qdict = qdict_get_qdict(resp, "error");
if (qdict) {
return qdict_get_str(qdict, "desc");
}
return NULL;
}
#define assert_error(qts, cpu_type, expected_error, fmt, ...) \
({ \
QDict *_resp; \
const char *_error; \
\
_resp = do_query(qts, cpu_type, fmt, ##__VA_ARGS__); \
g_assert(_resp); \
_error = resp_get_error(_resp); \
g_assert(_error); \
g_assert(g_str_equal(_error, expected_error)); \
qobject_unref(_resp); \
})
static bool resp_has_props(QDict *resp)
{
QDict *qdict;
g_assert(resp);
if (!qdict_haskey(resp, "return")) {
return false;
}
qdict = qdict_get_qdict(resp, "return");
if (!qdict_haskey(qdict, "model")) {
return false;
}
qdict = qdict_get_qdict(qdict, "model");
return qdict_haskey(qdict, "props");
}
static QDict *resp_get_props(QDict *resp)
{
QDict *qdict;
g_assert(resp);
g_assert(resp_has_props(resp));
qdict = qdict_get_qdict(resp, "return");
qdict = qdict_get_qdict(qdict, "model");
qdict = qdict_get_qdict(qdict, "props");
return qdict;
}
static bool resp_get_feature(QDict *resp, const char *feature)
{
QDict *props;
g_assert(resp);
g_assert(resp_has_props(resp));
props = resp_get_props(resp);
g_assert(qdict_get(props, feature));
return qdict_get_bool(props, feature);
}
#define assert_has_feature(qts, cpu_type, feature) \
({ \
QDict *_resp = do_query_no_props(qts, cpu_type); \
g_assert(_resp); \
g_assert(resp_has_props(_resp)); \
g_assert(qdict_get(resp_get_props(_resp), feature)); \
qobject_unref(_resp); \
})
#define assert_has_not_feature(qts, cpu_type, feature) \
({ \
QDict *_resp = do_query_no_props(qts, cpu_type); \
g_assert(_resp); \
g_assert(!resp_has_props(_resp) || \
!qdict_get(resp_get_props(_resp), feature)); \
qobject_unref(_resp); \
})
#define resp_assert_feature(resp, feature, expected_value) \
({ \
QDict *_props; \
\
g_assert(_resp); \
g_assert(resp_has_props(_resp)); \
_props = resp_get_props(_resp); \
g_assert(qdict_get(_props, feature)); \
g_assert(qdict_get_bool(_props, feature) == (expected_value)); \
})
#define assert_feature(qts, cpu_type, feature, expected_value) \
({ \
QDict *_resp; \
\
_resp = do_query_no_props(qts, cpu_type); \
g_assert(_resp); \
resp_assert_feature(_resp, feature, expected_value); \
qobject_unref(_resp); \
})
#define assert_set_feature(qts, cpu_type, feature, value) \
({ \
const char *_fmt = (value) ? "{ %s: true }" : "{ %s: false }"; \
QDict *_resp; \
\
_resp = do_query(qts, cpu_type, _fmt, feature); \
g_assert(_resp); \
resp_assert_feature(_resp, feature, value); \
qobject_unref(_resp); \
})
#define assert_has_feature_enabled(qts, cpu_type, feature) \
assert_feature(qts, cpu_type, feature, true)
#define assert_has_feature_disabled(qts, cpu_type, feature) \
assert_feature(qts, cpu_type, feature, false)
static void assert_type_full(QTestState *qts)
{
const char *error;
QDict *resp;
resp = qtest_qmp(qts, "{ 'execute': 'query-cpu-model-expansion', "
"'arguments': { 'type': 'static', "
"'model': { 'name': 'foo' }}}");
g_assert(resp);
error = resp_get_error(resp);
g_assert(error);
g_assert(g_str_equal(error,
"The requested expansion type is not supported"));
qobject_unref(resp);
}
static void assert_bad_props(QTestState *qts, const char *cpu_type)
{
const char *error;
QDict *resp;
resp = qtest_qmp(qts, "{ 'execute': 'query-cpu-model-expansion', "
"'arguments': { 'type': 'full', "
"'model': { 'name': %s, "
"'props': false }}}",
cpu_type);
g_assert(resp);
error = resp_get_error(resp);
g_assert(error);
g_assert(g_str_equal(error,
"Invalid parameter type for 'props', expected: dict"));
qobject_unref(resp);
}
static uint64_t resp_get_sve_vls(QDict *resp)
{
QDict *props;
const QDictEntry *e;
uint64_t vls = 0;
int n = 0;
g_assert(resp);
g_assert(resp_has_props(resp));
props = resp_get_props(resp);
for (e = qdict_first(props); e; e = qdict_next(props, e)) {
if (strlen(e->key) > 3 && !strncmp(e->key, "sve", 3) &&
g_ascii_isdigit(e->key[3])) {
char *endptr;
int bits;
bits = g_ascii_strtoll(&e->key[3], &endptr, 10);
if (!bits || *endptr != '\0') {
continue;
}
if (qdict_get_bool(props, e->key)) {
vls |= BIT_ULL((bits / 128) - 1);
}
++n;
}
}
g_assert(n == SVE_MAX_VQ);
return vls;
}
#define assert_sve_vls(qts, cpu_type, expected_vls, fmt, ...) \
({ \
QDict *_resp = do_query(qts, cpu_type, fmt, ##__VA_ARGS__); \
g_assert(_resp); \
g_assert(resp_has_props(_resp)); \
g_assert(resp_get_sve_vls(_resp) == expected_vls); \
qobject_unref(_resp); \
})
static void sve_tests_default(QTestState *qts, const char *cpu_type)
{
/*
* With no sve-max-vq or sve<N> properties on the command line
* the default is to have all vector lengths enabled. This also
* tests that 'sve' is 'on' by default.
*/
assert_sve_vls(qts, cpu_type, BIT_ULL(SVE_MAX_VQ) - 1, NULL);
/* With SVE off, all vector lengths should also be off. */
assert_sve_vls(qts, cpu_type, 0, "{ 'sve': false }");
/* With SVE on, we must have at least one vector length enabled. */
assert_error(qts, cpu_type, "cannot disable sve128", "{ 'sve128': false }");
/* Basic enable/disable tests. */
assert_sve_vls(qts, cpu_type, 0x7, "{ 'sve384': true }");
assert_sve_vls(qts, cpu_type, ((BIT_ULL(SVE_MAX_VQ) - 1) & ~BIT_ULL(2)),
"{ 'sve384': false }");
/*
* ---------------------------------------------------------------------
* power-of-two(vq) all-power- can can
* of-two(< vq) enable disable
* ---------------------------------------------------------------------
* vq < max_vq no MUST* yes yes
* vq < max_vq yes MUST* yes no
* ---------------------------------------------------------------------
* vq == max_vq n/a MUST* yes** yes**
* ---------------------------------------------------------------------
* vq > max_vq n/a no no yes
* vq > max_vq n/a yes yes yes
* ---------------------------------------------------------------------
*
* [*] "MUST" means this requirement must already be satisfied,
* otherwise 'max_vq' couldn't itself be enabled.
*
* [**] Not testable with the QMP interface, only with the command line.
*/
/* max_vq := 8 */
assert_sve_vls(qts, cpu_type, 0x8b, "{ 'sve1024': true }");
/* max_vq := 8, vq < max_vq, !power-of-two(vq) */
assert_sve_vls(qts, cpu_type, 0x8f,
"{ 'sve1024': true, 'sve384': true }");
assert_sve_vls(qts, cpu_type, 0x8b,
"{ 'sve1024': true, 'sve384': false }");
/* max_vq := 8, vq < max_vq, power-of-two(vq) */
assert_sve_vls(qts, cpu_type, 0x8b,
"{ 'sve1024': true, 'sve256': true }");
assert_error(qts, cpu_type, "cannot disable sve256",
"{ 'sve1024': true, 'sve256': false }");
/* max_vq := 3, vq > max_vq, !all-power-of-two(< vq) */
assert_error(qts, cpu_type, "cannot disable sve512",
"{ 'sve384': true, 'sve512': false, 'sve640': true }");
/*
* We can disable power-of-two vector lengths when all larger lengths
* are also disabled. We only need to disable the power-of-two length,
* as all non-enabled larger lengths will then be auto-disabled.
*/
assert_sve_vls(qts, cpu_type, 0x7, "{ 'sve512': false }");
/* max_vq := 3, vq > max_vq, all-power-of-two(< vq) */
assert_sve_vls(qts, cpu_type, 0x1f,
"{ 'sve384': true, 'sve512': true, 'sve640': true }");
assert_sve_vls(qts, cpu_type, 0xf,
"{ 'sve384': true, 'sve512': true, 'sve640': false }");
}
static void sve_tests_sve_max_vq_8(const void *data)
{
QTestState *qts;
qts = qtest_init(MACHINE "-cpu max,sve-max-vq=8");
assert_sve_vls(qts, "max", BIT_ULL(8) - 1, NULL);
/*
* Disabling the max-vq set by sve-max-vq is not allowed, but
* of course enabling it is OK.
*/
assert_error(qts, "max", "cannot disable sve1024", "{ 'sve1024': false }");
assert_sve_vls(qts, "max", 0xff, "{ 'sve1024': true }");
/*
* Enabling anything larger than max-vq set by sve-max-vq is not
* allowed, but of course disabling everything larger is OK.
*/
assert_error(qts, "max", "cannot enable sve1152", "{ 'sve1152': true }");
assert_sve_vls(qts, "max", 0xff, "{ 'sve1152': false }");
/*
* We can enable/disable non power-of-two lengths smaller than the
* max-vq set by sve-max-vq, but, while we can enable power-of-two
* lengths, we can't disable them.
*/
assert_sve_vls(qts, "max", 0xff, "{ 'sve384': true }");
assert_sve_vls(qts, "max", 0xfb, "{ 'sve384': false }");
assert_sve_vls(qts, "max", 0xff, "{ 'sve256': true }");
assert_error(qts, "max", "cannot disable sve256", "{ 'sve256': false }");
qtest_quit(qts);
}
static void sve_tests_sve_off(const void *data)
{
QTestState *qts;
qts = qtest_init(MACHINE "-cpu max,sve=off");
/* SVE is off, so the map should be empty. */
assert_sve_vls(qts, "max", 0, NULL);
/* The map stays empty even if we turn lengths off. */
assert_sve_vls(qts, "max", 0, "{ 'sve128': false }");
/* It's an error to enable lengths when SVE is off. */
assert_error(qts, "max", "cannot enable sve128", "{ 'sve128': true }");
/* With SVE re-enabled we should get all vector lengths enabled. */
assert_sve_vls(qts, "max", BIT_ULL(SVE_MAX_VQ) - 1, "{ 'sve': true }");
/* Or enable SVE with just specific vector lengths. */
assert_sve_vls(qts, "max", 0x3,
"{ 'sve': true, 'sve128': true, 'sve256': true }");
qtest_quit(qts);
}
static void sve_tests_sve_off_kvm(const void *data)
{
QTestState *qts;
qts = qtest_init(MACHINE_KVM "-cpu max,sve=off");
/*
* We don't know if this host supports SVE so we don't
* attempt to test enabling anything. We only test that
* everything is disabled (as it should be with sve=off)
* and that using sve<N>=off to explicitly disable vector
* lengths is OK too.
*/
assert_sve_vls(qts, "max", 0, NULL);
assert_sve_vls(qts, "max", 0, "{ 'sve128': false }");
qtest_quit(qts);
}
static void pauth_tests_default(QTestState *qts, const char *cpu_type)
{
assert_has_feature_enabled(qts, cpu_type, "pauth");
assert_has_feature_disabled(qts, cpu_type, "pauth-impdef");
assert_set_feature(qts, cpu_type, "pauth", false);
assert_set_feature(qts, cpu_type, "pauth", true);
assert_set_feature(qts, cpu_type, "pauth-impdef", true);
assert_set_feature(qts, cpu_type, "pauth-impdef", false);
assert_error(qts, cpu_type, "cannot enable pauth-impdef without pauth",
"{ 'pauth': false, 'pauth-impdef': true }");
}
static void test_query_cpu_model_expansion(const void *data)
{
QTestState *qts;
qts = qtest_init(MACHINE "-cpu max");
/* Test common query-cpu-model-expansion input validation */
assert_type_full(qts);
assert_bad_props(qts, "max");
assert_error(qts, "foo", "The CPU type 'foo' is not a recognized "
"ARM CPU type", NULL);
assert_error(qts, "max", "Parameter 'not-a-prop' is unexpected",
"{ 'not-a-prop': false }");
assert_error(qts, "host", "The CPU type 'host' requires KVM", NULL);
/* Test expected feature presence/absence for some cpu types */
assert_has_feature_enabled(qts, "cortex-a15", "pmu");
assert_has_not_feature(qts, "cortex-a15", "aarch64");
/* Enabling and disabling pmu should always work. */
assert_has_feature_enabled(qts, "max", "pmu");
assert_set_feature(qts, "max", "pmu", false);
assert_set_feature(qts, "max", "pmu", true);
assert_has_not_feature(qts, "max", "kvm-no-adjvtime");
assert_has_not_feature(qts, "max", "kvm-steal-time");
if (g_str_equal(qtest_get_arch(), "aarch64")) {
assert_has_feature_enabled(qts, "max", "aarch64");
assert_has_feature_enabled(qts, "max", "sve");
assert_has_feature_enabled(qts, "max", "sve128");
assert_has_feature_enabled(qts, "cortex-a57", "pmu");
assert_has_feature_enabled(qts, "cortex-a57", "aarch64");
assert_has_feature_enabled(qts, "a64fx", "pmu");
assert_has_feature_enabled(qts, "a64fx", "aarch64");
/*
* A64FX does not support any other vector lengths besides those
* that are enabled by default(128bit, 256bits, 512bit).
*/
assert_has_feature_enabled(qts, "a64fx", "sve");
assert_sve_vls(qts, "a64fx", 0xb, NULL);
assert_error(qts, "a64fx", "cannot enable sve384",
"{ 'sve384': true }");
assert_error(qts, "a64fx", "cannot enable sve640",
"{ 'sve640': true }");
sve_tests_default(qts, "max");
pauth_tests_default(qts, "max");
/* Test that features that depend on KVM generate errors without. */
assert_error(qts, "max",
"'aarch64' feature cannot be disabled "
"unless KVM is enabled and 32-bit EL1 "
"is supported",
"{ 'aarch64': false }");
}
qtest_quit(qts);
}
static void test_query_cpu_model_expansion_kvm(const void *data)
{
QTestState *qts;
qts = qtest_init(MACHINE_KVM "-cpu max");
/* Enabling and disabling kvm-no-adjvtime should always work. */
assert_has_feature_disabled(qts, "host", "kvm-no-adjvtime");
assert_set_feature(qts, "host", "kvm-no-adjvtime", true);
assert_set_feature(qts, "host", "kvm-no-adjvtime", false);
if (g_str_equal(qtest_get_arch(), "aarch64")) {
bool kvm_supports_steal_time;
bool kvm_supports_sve;
char max_name[8], name[8];
uint32_t max_vq, vq;
uint64_t vls;
QDict *resp;
char *error;
/*
* When using KVM, only the 'host' and 'max' CPU models are
* supported. Test that we're emitting a suitable error for
* unsupported CPU models.
*/
if (qtest_has_accel("tcg")) {
assert_error(qts, "cortex-a7",
"We cannot guarantee the CPU type 'cortex-a7' works "
"with KVM on this host", NULL);
} else {
/*
* With a KVM-only build the 32-bit CPUs are not present.
*/
assert_error(qts, "cortex-a7",
"The CPU type 'cortex-a7' is not a "
"recognized ARM CPU type", NULL);
}
assert_has_feature_enabled(qts, "host", "aarch64");
/* Enabling and disabling pmu should always work. */
assert_has_feature_enabled(qts, "host", "pmu");
assert_set_feature(qts, "host", "pmu", false);
assert_set_feature(qts, "host", "pmu", true);
/*
* Some features would be enabled by default, but they're disabled
* because this instance of KVM doesn't support them. Test that the
* features are present, and, when enabled, issue further tests.
*/
assert_has_feature(qts, "host", "kvm-steal-time");
assert_has_feature(qts, "host", "sve");
resp = do_query_no_props(qts, "host");
kvm_supports_steal_time = resp_get_feature(resp, "kvm-steal-time");
kvm_supports_sve = resp_get_feature(resp, "sve");
vls = resp_get_sve_vls(resp);
qobject_unref(resp);
if (kvm_supports_steal_time) {
/* If we have steal-time then we should be able to toggle it. */
assert_set_feature(qts, "host", "kvm-steal-time", false);
assert_set_feature(qts, "host", "kvm-steal-time", true);
}
if (kvm_supports_sve) {
g_assert(vls != 0);
max_vq = 64 - __builtin_clzll(vls);
sprintf(max_name, "sve%u", max_vq * 128);
/* Enabling a supported length is of course fine. */
assert_sve_vls(qts, "host", vls, "{ %s: true }", max_name);
/* Get the next supported length smaller than max-vq. */
vq = 64 - __builtin_clzll(vls & ~BIT_ULL(max_vq - 1));
if (vq) {
/*
* We have at least one length smaller than max-vq,
* so we can disable max-vq.
*/
assert_sve_vls(qts, "host", (vls & ~BIT_ULL(max_vq - 1)),
"{ %s: false }", max_name);
/*
* Smaller, supported vector lengths cannot be disabled
* unless all larger, supported vector lengths are also
* disabled.
*/
sprintf(name, "sve%u", vq * 128);
error = g_strdup_printf("cannot disable %s", name);
assert_error(qts, "host", error,
"{ %s: true, %s: false }",
max_name, name);
g_free(error);
}
/*
* The smallest, supported vector length is required, because
* we need at least one vector length enabled.
*/
vq = __builtin_ffsll(vls);
sprintf(name, "sve%u", vq * 128);
error = g_strdup_printf("cannot disable %s", name);
assert_error(qts, "host", error, "{ %s: false }", name);
g_free(error);
/* Get an unsupported length. */
for (vq = 1; vq <= max_vq; ++vq) {
if (!(vls & BIT_ULL(vq - 1))) {
break;
}
}
if (vq <= SVE_MAX_VQ) {
sprintf(name, "sve%u", vq * 128);
error = g_strdup_printf("cannot enable %s", name);
assert_error(qts, "host", error, "{ %s: true }", name);
g_free(error);
}
} else {
g_assert(vls == 0);
}
} else {
assert_has_not_feature(qts, "host", "aarch64");
assert_has_not_feature(qts, "host", "pmu");
assert_has_not_feature(qts, "host", "sve");
assert_has_not_feature(qts, "host", "kvm-steal-time");
}
qtest_quit(qts);
}
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
if (qtest_has_accel("tcg")) {
qtest_add_data_func("/arm/query-cpu-model-expansion",
NULL, test_query_cpu_model_expansion);
}
if (!g_str_equal(qtest_get_arch(), "aarch64")) {
goto out;
}
/*
* For now we only run KVM specific tests with AArch64 QEMU in
* order avoid attempting to run an AArch32 QEMU with KVM on
* AArch64 hosts. That won't work and isn't easy to detect.
*/
if (qtest_has_accel("kvm")) {
/*
* This tests target the 'host' CPU type, so register it only if
* KVM is available.
*/
qtest_add_data_func("/arm/kvm/query-cpu-model-expansion",
NULL, test_query_cpu_model_expansion_kvm);
qtest_add_data_func("/arm/kvm/query-cpu-model-expansion/sve-off",
NULL, sve_tests_sve_off_kvm);
}
if (qtest_has_accel("tcg")) {
qtest_add_data_func("/arm/max/query-cpu-model-expansion/sve-max-vq-8",
NULL, sve_tests_sve_max_vq_8);
qtest_add_data_func("/arm/max/query-cpu-model-expansion/sve-off",
NULL, sve_tests_sve_off);
}
out:
return g_test_run();
}
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