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14e99e0fbb
qemu/tests/arm-cpu-features.c
Andrew Jones 14e99e0fbb target/arm/kvm64: max cpu: Enable SVE when available 
Enable SVE in the KVM guest when the 'max' cpu type is configured
and KVM supports it. KVM SVE requires use of the new finalize
vcpu ioctl, so we add that now too. For starters SVE can only be
turned on or off, getting all vector lengths the host CPU supports
when on. We'll add the other SVE CPU properties in later patches.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Reviewed-by: Beata Michalska <beata.michalska@linaro.org>
Message-id: 20191031142734.8590-7-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-11-01 20:40:59 +00:00

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C
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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: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;
}
#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); \
})
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 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(qts, "max", "pmu");
assert_has_feature(qts, "cortex-a15", "pmu");
assert_has_not_feature(qts, "cortex-a15", "aarch64");
if (g_str_equal(qtest_get_arch(), "aarch64")) {
assert_has_feature(qts, "max", "aarch64");
assert_has_feature(qts, "max", "sve");
assert_has_feature(qts, "max", "sve128");
assert_has_feature(qts, "cortex-a57", "pmu");
assert_has_feature(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;
}
if (g_str_equal(qtest_get_arch(), "aarch64")) {
assert_has_feature(qts, "host", "aarch64");
assert_has_feature(qts, "host", "pmu");
assert_has_feature(qts, "max", "sve");
assert_error(qts, "cortex-a15",
"We cannot guarantee the CPU type 'cortex-a15' works "
"with KVM on this host", NULL);
} else {
assert_has_not_feature(qts, "host", "aarch64");
assert_has_not_feature(qts, "host", "pmu");
assert_has_not_feature(qts, "max", "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);
}
return g_test_run();
}
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