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([102.35.208.160]) by smtp.gmail.com with ESMTPSA id cc19-20020a5d5c13000000b0033b728190c1sm8550261wrb.79.2024.02.13.01.40.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Feb 2024 01:40:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1707817249; x=1708422049; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=vCBh+sFjh3zKr3oSSR0kXcIxKMfrzUcKpwKGEsMrXDk=; b=pGyBTzOwt1pO4wasGYZ663qBL63F5iAAzateDsIsees73x5CyuM4kdhAaGYpPbiGhv zso++uxasw4KtGU0qLsmaeWoLNjaHwvkgLPHhSkqrf1Z/JFx6RWR5BlbCm7e4tHs24k6 RXrKKQez9W577AaphQEgag+ruGVTu2ZAOp3J/ZKsd8dO4PuZXJsL7XjDV1AFRvdGJMj7 sYE5G5E9zIAGfqR3dbzK/EVdEBe0+IwrLhv6vWRCYJpRrhCezeFMPr/wvZUQz5gDmAP7 STVVlIRtAfyXOTODQfw1eOwF3b0H4meHyQYm9gDUbsLAVDOrskcDLTMK50iLiAYp2Aar psfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707817249; x=1708422049; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=vCBh+sFjh3zKr3oSSR0kXcIxKMfrzUcKpwKGEsMrXDk=; b=IynKsScfeq9TAeN/+Ea7i3nMitawZcRnyB3P11HiN1cWUlLgRXenlzHAb4Wn8Aajyh 7GLZRgBpRUESzc6734J6iL9jQZirJhNQt66GtvpahRM0N5tqXMuObNcOoBLFEbRWhPSh W0gfYDEGibCcDbd4edeVapNi6KJTP4DyfFz6Od3YV9v/cmjfJTXIFn2ELWBTrLbAuys3 U0C3qZROq6Tfm7f7tlJJdUaj/PrX5XC8UKLEpiKOoND257Bn8deYm2wOUrtQNIe65Ab9 qtDubVOFGye568wH8DefLagdgLHgBE3KcjAG7usAbJVs+AoSqhTAi2hJbdhRUNlSzXRD 6JhQ== X-Gm-Message-State: AOJu0YyMxCDE3tCGoaWkT/kqJBm2eskLvHkpkMwiUMcCBCzz5w8K3D3X HLuAF0njqzm9tSgjKniMk7MGDtxIBV5IcV+zaHlGPnjCjS9DdniiGruGaM5uUlShOMG+2zRHcga y X-Google-Smtp-Source: AGHT+IGUc5IY6bvOK54MA5TPnJ/Eam+9+6k+7C3RSE97dklNxCpFI0w83yLrXx0LxiNwhoWnHP97QA== X-Received: by 2002:a5d:64cd:0:b0:33b:80a7:6538 with SMTP id f13-20020a5d64cd000000b0033b80a76538mr5540062wri.9.1707817248913; Tue, 13 Feb 2024 01:40:48 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCUoNh9OoWmD91vZ6JyXJYp7SRfT+u1wr4q5CDbFVCZSB6nUlbR3XD8qg5oTEvioJJJOIOOSCUDgcBtzuXoELGka8SU9p+cmJ9A6DA3SyMDLnoSSH2EkU6Ia8TI6s8tTcxR+FC4hOdDM9DdtqemOaXhM/dSoe7GgfrUreU7EXMSMjdW0I6bGzXvCDLDuNocrDYS00xeRmSqtD2BD/clv3qmQGngjVssoizK7PAv86sfeJXrWLp2X60fNOnpK5oM4zNaKbEvwhslTpp3bH4k7oEt6iiHG87C9LdTmxAiXH4+bKBTn4oHtqhmwkD0X7S7yiM8JnfhR6oXiEms6m3rq+UidwI1HUQ== From: Pierrick Bouvier To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , Yanan Wang , Marcel Apfelbaum , Paolo Bonzini , Mahmoud Mandour , Pierrick Bouvier , Alexandre Iooss , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Eduardo Habkost , Richard Henderson Subject: [PATCH v4 05/18] plugins: scoreboard API Date: Tue, 13 Feb 2024 13:39:55 +0400 Message-ID: <20240213094009.150349-6-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240213094009.150349-1-pierrick.bouvier@linaro.org> References: <20240213094009.150349-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::436; envelope-from=pierrick.bouvier@linaro.org; helo=mail-wr1-x436.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1707817403079100006 Content-Type: text/plain; charset="utf-8" We introduce a cpu local storage, automatically managed (and extended) by QEMU itself. Plugin allocate a scoreboard, and don't have to deal with how many cpus are launched. This API will be used by new inline functions but callbacks can benefit from this as well. This way, they can operate without a global lock for simple operations. At any point during execution, any scoreboard will be dimensioned with at least qemu_plugin_num_vcpus entries. New functions: - qemu_plugin_scoreboard_find - qemu_plugin_scoreboard_free - qemu_plugin_scoreboard_new Signed-off-by: Pierrick Bouvier Reviewed-by: Richard Henderson --- include/qemu/plugin.h | 6 ++++ include/qemu/qemu-plugin.h | 31 ++++++++++++++++++++ plugins/plugin.h | 6 ++++ plugins/api.c | 20 +++++++++++++ plugins/core.c | 57 ++++++++++++++++++++++++++++++++++++ plugins/qemu-plugins.symbols | 3 ++ 6 files changed, 123 insertions(+) diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h index b0c5ac68293..ccf9d2ebd2d 100644 --- a/include/qemu/plugin.h +++ b/include/qemu/plugin.h @@ -112,6 +112,12 @@ struct qemu_plugin_insn { bool mem_only; }; =20 +/* A scoreboard is an array of values, indexed by vcpu_index */ +struct qemu_plugin_scoreboard { + GArray *data; + QLIST_ENTRY(qemu_plugin_scoreboard) entry; +}; + /* * qemu_plugin_insn allocate and cleanup functions. We don't expect to * cleanup many of these structures. They are reused for each fresh diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index e94ae4d2abb..0994935d4a2 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -222,6 +222,8 @@ void qemu_plugin_register_vcpu_resume_cb(qemu_plugin_id= _t id, struct qemu_plugin_tb; /** struct qemu_plugin_insn - Opaque handle for a translated instruction */ struct qemu_plugin_insn; +/** struct qemu_plugin_scoreboard - Opaque handle for a scoreboard */ +struct qemu_plugin_scoreboard; =20 /** * enum qemu_plugin_cb_flags - type of callback @@ -753,5 +755,34 @@ int qemu_plugin_read_register(unsigned int vcpu, struct qemu_plugin_register *handle, GByteArray *buf); =20 +/** + * qemu_plugin_scoreboard_new() - alloc a new scoreboard + * + * @element_size: size (in bytes) for one entry + * + * Returns a pointer to a new scoreboard. It must be freed using + * qemu_plugin_scoreboard_free. + */ +QEMU_PLUGIN_API +struct qemu_plugin_scoreboard *qemu_plugin_scoreboard_new(size_t element_s= ize); + +/** + * qemu_plugin_scoreboard_free() - free a scoreboard + * @score: scoreboard to free + */ +QEMU_PLUGIN_API +void qemu_plugin_scoreboard_free(struct qemu_plugin_scoreboard *score); + +/** + * qemu_plugin_scoreboard_find() - get pointer to an entry of a scoreboard + * @score: scoreboard to query + * @vcpu_index: entry index + * + * Returns address of entry of a scoreboard matching a given vcpu_index. T= his + * address can be modified later if scoreboard is resized. + */ +QEMU_PLUGIN_API +void *qemu_plugin_scoreboard_find(struct qemu_plugin_scoreboard *score, + unsigned int vcpu_index); =20 #endif /* QEMU_QEMU_PLUGIN_H */ diff --git a/plugins/plugin.h b/plugins/plugin.h index 00b3509f708..043c740067d 100644 --- a/plugins/plugin.h +++ b/plugins/plugin.h @@ -31,6 +31,8 @@ struct qemu_plugin_state { * but with the HT we avoid adding a field to CPUState. */ GHashTable *cpu_ht; + QLIST_HEAD(, qemu_plugin_scoreboard) scoreboards; + size_t scoreboard_alloc_size; DECLARE_BITMAP(mask, QEMU_PLUGIN_EV_MAX); /* * @lock protects the struct as well as ctx->uninstalling. @@ -101,4 +103,8 @@ void exec_inline_op(struct qemu_plugin_dyn_cb *cb); =20 int plugin_num_vcpus(void); =20 +struct qemu_plugin_scoreboard *plugin_scoreboard_new(size_t element_size); + +void plugin_scoreboard_free(struct qemu_plugin_scoreboard *score); + #endif /* PLUGIN_H */ diff --git a/plugins/api.c b/plugins/api.c index dbfc5e83729..76fbca685f4 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -521,3 +521,23 @@ static void __attribute__((__constructor__)) qemu_api_= init(void) qemu_mutex_init(®_handle_lock); =20 } + +struct qemu_plugin_scoreboard *qemu_plugin_scoreboard_new(size_t element_s= ize) +{ + return plugin_scoreboard_new(element_size); +} + +void qemu_plugin_scoreboard_free(struct qemu_plugin_scoreboard *score) +{ + plugin_scoreboard_free(score); +} + +void *qemu_plugin_scoreboard_find(struct qemu_plugin_scoreboard *score, + unsigned int vcpu_index) +{ + g_assert(vcpu_index < qemu_plugin_num_vcpus()); + /* we can't use g_array_index since entry size is not statically known= */ + char *base_ptr =3D score->data->data; + return base_ptr + vcpu_index * g_array_get_element_size(score->data); +} + diff --git a/plugins/core.c b/plugins/core.c index 609d9d5c184..cd0c717e291 100644 --- a/plugins/core.c +++ b/plugins/core.c @@ -17,6 +17,7 @@ #include "qapi/error.h" #include "qemu/lockable.h" #include "qemu/option.h" +#include "qemu/queue.h" #include "qemu/rcu_queue.h" #include "qemu/xxhash.h" #include "qemu/rcu.h" @@ -209,6 +210,35 @@ plugin_register_cb_udata(qemu_plugin_id_t id, enum qem= u_plugin_event ev, do_plugin_register_cb(id, ev, func, udata); } =20 +static void plugin_grow_scoreboards__locked(CPUState *cpu) +{ + if (cpu->cpu_index < plugin.scoreboard_alloc_size) { + return; + } + + bool need_realloc =3D FALSE; + while (cpu->cpu_index >=3D plugin.scoreboard_alloc_size) { + plugin.scoreboard_alloc_size *=3D 2; + need_realloc =3D TRUE; + } + + + if (!need_realloc || QLIST_EMPTY(&plugin.scoreboards)) { + /* nothing to do, we just updated sizes for future scoreboards */ + return; + } + + /* cpus must be stopped, as tb might still use an existing scoreboard.= */ + start_exclusive(); + struct qemu_plugin_scoreboard *score; + QLIST_FOREACH(score, &plugin.scoreboards, entry) { + g_array_set_size(score->data, plugin.scoreboard_alloc_size); + } + /* force all tb to be flushed, as scoreboard pointers were changed. */ + tb_flush(cpu); + end_exclusive(); +} + void qemu_plugin_vcpu_init_hook(CPUState *cpu) { bool success; @@ -219,6 +249,7 @@ void qemu_plugin_vcpu_init_hook(CPUState *cpu) success =3D g_hash_table_insert(plugin.cpu_ht, &cpu->cpu_index, &cpu->cpu_index); g_assert(success); + plugin_grow_scoreboards__locked(cpu); qemu_rec_mutex_unlock(&plugin.lock); =20 plugin_vcpu_cb__simple(cpu, QEMU_PLUGIN_EV_VCPU_INIT); @@ -572,6 +603,8 @@ static void __attribute__((__constructor__)) plugin_ini= t(void) qemu_rec_mutex_init(&plugin.lock); plugin.id_ht =3D g_hash_table_new(g_int64_hash, g_int64_equal); plugin.cpu_ht =3D g_hash_table_new(g_int_hash, g_int_equal); + QLIST_INIT(&plugin.scoreboards); + plugin.scoreboard_alloc_size =3D 16; /* avoid frequent reallocation */ QTAILQ_INIT(&plugin.ctxs); qht_init(&plugin.dyn_cb_arr_ht, plugin_dyn_cb_arr_cmp, 16, QHT_MODE_AUTO_RESIZE); @@ -582,3 +615,27 @@ int plugin_num_vcpus(void) { return plugin.num_vcpus; } + +struct qemu_plugin_scoreboard *plugin_scoreboard_new(size_t element_size) +{ + struct qemu_plugin_scoreboard *score =3D + g_malloc0(sizeof(struct qemu_plugin_scoreboard)); + score->data =3D g_array_new(FALSE, TRUE, element_size); + g_array_set_size(score->data, plugin.scoreboard_alloc_size); + + qemu_rec_mutex_lock(&plugin.lock); + QLIST_INSERT_HEAD(&plugin.scoreboards, score, entry); + qemu_rec_mutex_unlock(&plugin.lock); + + return score; +} + +void plugin_scoreboard_free(struct qemu_plugin_scoreboard *score) +{ + qemu_rec_mutex_lock(&plugin.lock); + QLIST_REMOVE(score, entry); + qemu_rec_mutex_unlock(&plugin.lock); + + g_array_free(score->data, TRUE); + g_free(score); +} diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols index 27fe97239be..3f93e7d6b13 100644 --- a/plugins/qemu-plugins.symbols +++ b/plugins/qemu-plugins.symbols @@ -37,6 +37,9 @@ qemu_plugin_register_vcpu_tb_exec_inline; qemu_plugin_register_vcpu_tb_trans_cb; qemu_plugin_reset; + qemu_plugin_scoreboard_free; + qemu_plugin_scoreboard_find; + qemu_plugin_scoreboard_new; qemu_plugin_start_code; qemu_plugin_tb_get_insn; qemu_plugin_tb_n_insns; --=20 2.43.0