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qemu/tests/qtest/arm-cpu-features.c
Andrew Jones dea101a1ae target/arm/cpu: Add the kvm-no-adjvtime CPU property 
kvm-no-adjvtime is a KVM specific CPU property and a first of its
kind. To accommodate it we also add kvm_arm_add_vcpu_properties()
and a KVM specific CPU properties description to the CPU features
document.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-id: 20200120101023.16030-7-drjones@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-01-30 16:02:06 +00:00

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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 -accel tcg "
#define QUERY_HEAD "{ 'execute': 'query-cpu-model-expansion', " \
" 'arguments': { 'type': 'full', "
#define QUERY_TAIL "}}"
static bool kvm_enabled(QTestState *qts)
{
QDict *resp, *qdict;
bool enabled;
resp = qtest_qmp(qts, "{ 'execute': 'query-kvm' }");
g_assert(qdict_haskey(resp, "return"));
qdict = qdict_get_qdict(resp, "return");
g_assert(qdict_haskey(qdict, "enabled"));
enabled = qdict_get_bool(qdict, "enabled");
qobject_unref(resp);
return enabled;
}
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);
}
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 assert_feature(qts, cpu_type, feature, expected_value) \
({ \
QDict *_resp, *_props; \
\
_resp = do_query_no_props(qts, cpu_type); \
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)); \
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 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, "max", "pmu");
assert_has_feature_enabled(qts, "cortex-a15", "pmu");
assert_has_not_feature(qts, "cortex-a15", "aarch64");
assert_has_not_feature(qts, "max", "kvm-no-adjvtime");
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");
sve_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");
/*
* These tests target the 'host' CPU type, so KVM must be enabled.
*/
if (!kvm_enabled(qts)) {
qtest_quit(qts);
return;
}
assert_has_feature_disabled(qts, "host", "kvm-no-adjvtime");
if (g_str_equal(qtest_get_arch(), "aarch64")) {
bool kvm_supports_sve;
char max_name[8], name[8];
uint32_t max_vq, vq;
uint64_t vls;
QDict *resp;
char *error;
assert_has_feature_enabled(qts, "host", "aarch64");
assert_has_feature_enabled(qts, "host", "pmu");
assert_error(qts, "cortex-a15",
"We cannot guarantee the CPU type 'cortex-a15' works "
"with KVM on this host", NULL);
assert_has_feature(qts, "host", "sve");
resp = do_query_no_props(qts, "host");
kvm_supports_sve = resp_get_feature(resp, "sve");
vls = resp_get_sve_vls(resp);
qobject_unref(resp);
if (kvm_supports_sve) {
g_assert(vls != 0);
max_vq = 64 - __builtin_clzll(vls);
sprintf(max_name, "sve%d", 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%d", 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%d", 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%d", 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");
}
qtest_quit(qts);
}
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
qtest_add_data_func("/arm/query-cpu-model-expansion",
NULL, test_query_cpu_model_expansion);
/*
* 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 (g_str_equal(qtest_get_arch(), "aarch64")) {
qtest_add_data_func("/arm/kvm/query-cpu-model-expansion",
NULL, test_query_cpu_model_expansion_kvm);
}
if (g_str_equal(qtest_get_arch(), "aarch64")) {
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);
qtest_add_data_func("/arm/kvm/query-cpu-model-expansion/sve-off",
NULL, sve_tests_sve_off_kvm);
}
return g_test_run();
}
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