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accel/system: Introduce @x-accel-stats QMP command

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Unstable QMP 'x-accel-stats' dispatches to the
AccelOpsClass::get_stats() and get_vcpu_stats() handlers.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-Id: <20250715140048.84942-4-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé
2025-07-02 15:03:12 +02:00
parent 8cc04fd9df
commit 1861993f1f
6 changed files with 59 additions and 1 deletions
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35
accel/accel-qmp.c Normal file
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@@ -0,0 +1,35 @@
/*
* QMP commands related to accelerators
*
* Copyright (c) Linaro
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/accel.h"
#include "qapi/type-helpers.h"
#include "qapi/qapi-commands-accelerator.h"
#include "accel/accel-ops.h"
#include "accel/accel-cpu-ops.h"
#include "hw/core/cpu.h"
HumanReadableText *qmp_x_accel_stats(Error **errp)
{
AccelState *accel = current_accel();
AccelClass *acc = ACCEL_GET_CLASS(accel);
g_autoptr(GString) buf = g_string_new("");
if (acc->get_stats) {
acc->get_stats(accel, buf);
}
if (acc->ops->get_vcpu_stats) {
CPUState *cpu;
CPU_FOREACH(cpu) {
acc->ops->get_vcpu_stats(cpu, buf);
}
}
return human_readable_text_from_str(buf);
}

1
accel/accel-system.c
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@@ -26,6 +26,7 @@
#include "qemu/osdep.h"
#include "qemu/accel.h"
#include "hw/boards.h"
#include "hw/core/cpu.h"
#include "accel/accel-ops.h"
#include "accel/accel-cpu-ops.h"
#include "system/cpus.h"

2
accel/meson.build
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@@ -1,6 +1,6 @@
common_ss.add(files('accel-common.c'))
specific_ss.add(files('accel-target.c'))
system_ss.add(files('accel-system.c', 'accel-blocker.c'))
system_ss.add(files('accel-system.c', 'accel-blocker.c', 'accel-qmp.c'))
user_ss.add(files('accel-user.c'))
subdir('tcg')

3
include/accel/accel-cpu-ops.h
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@@ -65,6 +65,9 @@ struct AccelOpsClass {
/* handle_interrupt is mandatory. */
void (*handle_interrupt)(CPUState *cpu, int mask);
/* get_vcpu_stats: Append statistics of this @cpu to @buf */
void (*get_vcpu_stats)(CPUState *cpu, GString *buf);
/**
* @get_virtual_clock: fetch virtual clock
* @set_virtual_clock: set virtual clock

2
include/accel/accel-ops.h
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@@ -25,6 +25,8 @@ struct AccelClass {
int (*init_machine)(AccelState *as, MachineState *ms);
bool (*cpu_common_realize)(CPUState *cpu, Error **errp);
void (*cpu_common_unrealize)(CPUState *cpu);
/* get_stats: Append statistics to @buf */
void (*get_stats)(AccelState *as, GString *buf);
/* system related hooks */
void (*setup_post)(AccelState *as);

17
qapi/accelerator.json
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@@ -37,3 +37,20 @@
# <- { "return": { "enabled": true, "present": true } }
##
{ 'command': 'query-kvm', 'returns': 'KvmInfo' }
##
# @x-accel-stats:
#
# Query accelerator statistics
#
# Features:
#
# @unstable: This command is meant for debugging.
#
# Returns: accelerator statistics
#
# Since: 10.1
##
{ 'command': 'x-accel-stats',
'returns': 'HumanReadableText',
'features': [ 'unstable' ] }