From patchwork Mon Mar 25 12:41:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pierrick Bouvier X-Patchwork-Id: 13602037 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 023D3C54E64 for ; Mon, 25 Mar 2024 12:43:40 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rojfF-0000Vw-B5; Mon, 25 Mar 2024 08:42:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rojel-000074-F4 for qemu-devel@nongnu.org; Mon, 25 Mar 2024 08:42:28 -0400 Received: from mail-lf1-x134.google.com ([2a00:1450:4864:20::134]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1rojei-0006gB-0u for qemu-devel@nongnu.org; Mon, 25 Mar 2024 08:42:27 -0400 Received: by mail-lf1-x134.google.com with SMTP id 2adb3069b0e04-513dd2d2415so4416671e87.3 for ; Mon, 25 Mar 2024 05:42:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1711370541; x=1711975341; 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=Ake/TfBhChsPmgzetPejkPjBpwkC48vEzueuxEbDyeE=; b=Ro1KszLB4LuNHCjBsEIk/Q1a0uAP/SyOGi/FDbJ0ZjdVbBjJZP14sta/g4R7LQ7Tph kicLZTUS6JSoIm3g4OUHpfI3PA/Co1+0cxtbzWG6Ux0hlz1Tf6ODJSsxMjDINxo5542W E49G6Bft4wXLevofFG0IJEemdtOcHKtnXtKuVXab1YlIFKD7SPB2Uh2fBLQVQ52tMJmr gmfSAQrdvShpNLBUB9U9ZcShM72HzfPF7iIogijBXnp1elal1wnWm7JelEaeJoks8vJS 8KJ25d/LiIu9jlpKO8yiP7RerRM0ygAvGkmzAilpDDjNr9yEVA0PZUX5pDHIaIKw63I0 ghpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711370541; x=1711975341; 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=Ake/TfBhChsPmgzetPejkPjBpwkC48vEzueuxEbDyeE=; b=xGLIRDmIzrWbDtKdnJNARsPLnrR1M6yWInRu/nC99KyHt6wJ41DxvYg/BwT+lgPU6+ UKRAAtxglYqnH6B2tMEU06rSdWYwihCrVpJ09+58whT+DDz7cUJNpXi4F5b0FKdazG+L AqbGWF+u00u47lOxhVB+8h4RRm3Vhf7g/wkOCAG/AkNpMSk3bThl34TGxxWkJDKnOyYP QTgIuqocIQqthNAeAIB05FUrw4a7uV/sgptHSr/eZVoHcn+XYAapDNS8RwRUXin0nDfl DO/4rCmFkC1tfN8YE1zRUKckWup6qocRwJA6jGbCUXWlarJDALztRiY2amv7qKrecJOy imYg== X-Gm-Message-State: AOJu0YwtphZMK1pMOeioAN7P0YmHnS8+lfE+73tqkW8sfBRrHWiBpbpA UssWrBEfyzyOR1c3/myKGvw2EyDMEc+Db4eKARBnRORwvEmT5SpkKBr6SkesReQtsW/X+CDtkx+ y X-Google-Smtp-Source: AGHT+IFDl47e0OYmriACIvsd9tAWqjZO1/A01Q6HIFgGbnmdQEhe9qT3mPveudiuaQzdZPNzerqibA== X-Received: by 2002:ac2:5494:0:b0:513:e63c:cfe7 with SMTP id t20-20020ac25494000000b00513e63ccfe7mr4056887lfk.66.1711370540935; Mon, 25 Mar 2024 05:42:20 -0700 (PDT) Received: from linaro.. ([102.35.208.160]) by smtp.gmail.com with ESMTPSA id t20-20020ac243b4000000b00515b1b3a2bdsm35231lfl.194.2024.03.25.05.42.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Mar 2024 05:42:20 -0700 (PDT) From: Pierrick Bouvier To: qemu-devel@nongnu.org Cc: =?utf-8?q?Alex_Benn=C3=A9e?= , Alexandre Iooss , Pierrick Bouvier , Richard Henderson , Paolo Bonzini , Mahmoud Mandour Subject: [PATCH v3 5/8] plugins: conditional callbacks Date: Mon, 25 Mar 2024 16:41:48 +0400 Message-Id: <20240325124151.336003-6-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240325124151.336003-1-pierrick.bouvier@linaro.org> References: <20240325124151.336003-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::134; envelope-from=pierrick.bouvier@linaro.org; helo=mail-lf1-x134.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 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Extend plugins API to support callback called with a given criteria (evaluated inline). Added functions: - qemu_plugin_register_vcpu_tb_exec_cond_cb - qemu_plugin_register_vcpu_insn_exec_cond_cb They expect as parameter a condition, a qemu_plugin_u64_t (op1) and an immediate (op2). Callback is called if op1 |cond| op2 is true. Signed-off-by: Pierrick Bouvier Reviewed-by: Richard Henderson --- include/qemu/plugin.h | 8 ++++ include/qemu/qemu-plugin.h | 76 ++++++++++++++++++++++++++++++++++++ plugins/plugin.h | 8 ++++ accel/tcg/plugin-gen.c | 48 +++++++++++++++++++++++ plugins/api.c | 39 ++++++++++++++++++ plugins/core.c | 32 +++++++++++++++ plugins/qemu-plugins.symbols | 2 + 7 files changed, 213 insertions(+) diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h index d1d9b4490df..bb224b8e4c7 100644 --- a/include/qemu/plugin.h +++ b/include/qemu/plugin.h @@ -67,6 +67,7 @@ union qemu_plugin_cb_sig { enum plugin_dyn_cb_type { PLUGIN_CB_REGULAR, + PLUGIN_CB_COND, PLUGIN_CB_MEM_REGULAR, PLUGIN_CB_INLINE_ADD_U64, PLUGIN_CB_INLINE_STORE_U64, @@ -88,6 +89,13 @@ struct qemu_plugin_dyn_cb { union qemu_plugin_cb_sig f; TCGHelperInfo *info; } regular; + struct { + union qemu_plugin_cb_sig f; + TCGHelperInfo *info; + qemu_plugin_u64 entry; + enum qemu_plugin_cond cond; + uint64_t imm; + } cond; struct { qemu_plugin_u64 entry; enum qemu_plugin_op op; diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index c5cac897a0b..337de25ece7 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -262,6 +262,29 @@ enum qemu_plugin_mem_rw { QEMU_PLUGIN_MEM_RW, }; +/** + * enum qemu_plugin_cond - condition to enable callback + * + * @QEMU_PLUGIN_COND_NEVER: false + * @QEMU_PLUGIN_COND_ALWAYS: true + * @QEMU_PLUGIN_COND_EQ: is equal? + * @QEMU_PLUGIN_COND_NE: is not equal? + * @QEMU_PLUGIN_COND_LT: is less than? + * @QEMU_PLUGIN_COND_LE: is less than or equal? + * @QEMU_PLUGIN_COND_GT: is greater than? + * @QEMU_PLUGIN_COND_GE: is greater than or equal? + */ +enum qemu_plugin_cond { + QEMU_PLUGIN_COND_NEVER, + QEMU_PLUGIN_COND_ALWAYS, + QEMU_PLUGIN_COND_EQ, + QEMU_PLUGIN_COND_NE, + QEMU_PLUGIN_COND_LT, + QEMU_PLUGIN_COND_LE, + QEMU_PLUGIN_COND_GT, + QEMU_PLUGIN_COND_GE, +}; + /** * typedef qemu_plugin_vcpu_tb_trans_cb_t - translation callback * @id: unique plugin id @@ -301,6 +324,32 @@ void qemu_plugin_register_vcpu_tb_exec_cb(struct qemu_plugin_tb *tb, enum qemu_plugin_cb_flags flags, void *userdata); +/** + * qemu_plugin_register_vcpu_tb_exec_cond_cb() - register conditional callback + * @tb: the opaque qemu_plugin_tb handle for the translation + * @cb: callback function + * @cond: condition to enable callback + * @entry: first operand for condition + * @imm: second operand for condition + * @flags: does the plugin read or write the CPU's registers? + * @userdata: any plugin data to pass to the @cb? + * + * The @cb function is called when a translated unit executes if + * entry @cond imm is true. + * If condition is QEMU_PLUGIN_COND_ALWAYS, condition is never interpreted and + * this function is equivalent to qemu_plugin_register_vcpu_tb_exec_cb. + * If condition QEMU_PLUGIN_COND_NEVER, condition is never interpreted and + * callback is never installed. + */ +QEMU_PLUGIN_API +void qemu_plugin_register_vcpu_tb_exec_cond_cb(struct qemu_plugin_tb *tb, + qemu_plugin_vcpu_udata_cb_t cb, + enum qemu_plugin_cb_flags flags, + enum qemu_plugin_cond cond, + qemu_plugin_u64 entry, + uint64_t imm, + void *userdata); + /** * enum qemu_plugin_op - describes an inline op * @@ -344,6 +393,33 @@ void qemu_plugin_register_vcpu_insn_exec_cb(struct qemu_plugin_insn *insn, enum qemu_plugin_cb_flags flags, void *userdata); +/** + * qemu_plugin_register_vcpu_insn_exec_cond_cb() - conditional insn execution cb + * @insn: the opaque qemu_plugin_insn handle for an instruction + * @cb: callback function + * @flags: does the plugin read or write the CPU's registers? + * @cond: condition to enable callback + * @entry: first operand for condition + * @imm: second operand for condition + * @userdata: any plugin data to pass to the @cb? + * + * The @cb function is called when an instruction executes if + * entry @cond imm is true. + * If condition is QEMU_PLUGIN_COND_ALWAYS, condition is never interpreted and + * this function is equivalent to qemu_plugin_register_vcpu_insn_exec_cb. + * If condition QEMU_PLUGIN_COND_NEVER, condition is never interpreted and + * callback is never installed. + */ +QEMU_PLUGIN_API +void qemu_plugin_register_vcpu_insn_exec_cond_cb( + struct qemu_plugin_insn *insn, + qemu_plugin_vcpu_udata_cb_t cb, + enum qemu_plugin_cb_flags flags, + enum qemu_plugin_cond cond, + qemu_plugin_u64 entry, + uint64_t imm, + void *userdata); + /** * qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu() - insn exec inline op * @insn: the opaque qemu_plugin_insn handle for an instruction diff --git a/plugins/plugin.h b/plugins/plugin.h index 7c34f23cfcb..7d4b4e21f7c 100644 --- a/plugins/plugin.h +++ b/plugins/plugin.h @@ -93,6 +93,14 @@ plugin_register_dyn_cb__udata(GArray **arr, qemu_plugin_vcpu_udata_cb_t cb, enum qemu_plugin_cb_flags flags, void *udata); +void +plugin_register_dyn_cond_cb__udata(GArray **arr, + qemu_plugin_vcpu_udata_cb_t cb, + enum qemu_plugin_cb_flags flags, + enum qemu_plugin_cond cond, + qemu_plugin_u64 entry, + uint64_t imm, + void *udata); void plugin_register_vcpu_mem_cb(GArray **arr, void *cb, diff --git a/accel/tcg/plugin-gen.c b/accel/tcg/plugin-gen.c index 45856a75cda..7ecaf670d93 100644 --- a/accel/tcg/plugin-gen.c +++ b/accel/tcg/plugin-gen.c @@ -139,6 +139,51 @@ static TCGv_ptr gen_plugin_u64_ptr(qemu_plugin_u64 entry) return ptr; } +static TCGCond plugin_cond_to_tcgcond(enum qemu_plugin_cond cond) +{ + switch (cond) { + case QEMU_PLUGIN_COND_EQ: + return TCG_COND_EQ; + case QEMU_PLUGIN_COND_NE: + return TCG_COND_NE; + case QEMU_PLUGIN_COND_LT: + return TCG_COND_LTU; + case QEMU_PLUGIN_COND_LE: + return TCG_COND_LEU; + case QEMU_PLUGIN_COND_GT: + return TCG_COND_GTU; + case QEMU_PLUGIN_COND_GE: + return TCG_COND_GEU; + default: + /* ALWAYS and NEVER conditions should never reach */ + g_assert_not_reached(); + } +} + +static void gen_udata_cond_cb(struct qemu_plugin_dyn_cb *cb) +{ + TCGv_ptr ptr = gen_plugin_u64_ptr(cb->cond.entry); + TCGv_i32 cpu_index = tcg_temp_ebb_new_i32(); + TCGv_i64 val = tcg_temp_ebb_new_i64(); + TCGLabel *after_cb = gen_new_label(); + + /* Condition should be negated, as calling the cb is the "else" path */ + TCGCond cond = tcg_invert_cond(plugin_cond_to_tcgcond(cb->cond.cond)); + + tcg_gen_ld_i64(val, ptr, 0); + tcg_gen_brcondi_i64(cond, val, cb->cond.imm, after_cb); + tcg_gen_ld_i32(cpu_index, tcg_env, + -offsetof(ArchCPU, env) + offsetof(CPUState, cpu_index)); + tcg_gen_call2(cb->cond.f.vcpu_udata, cb->cond.info, NULL, + tcgv_i32_temp(cpu_index), + tcgv_ptr_temp(tcg_constant_ptr(cb->userp))); + gen_set_label(after_cb); + + tcg_temp_free_i64(val); + tcg_temp_free_i32(cpu_index); + tcg_temp_free_ptr(ptr); +} + static void gen_inline_add_u64_cb(struct qemu_plugin_dyn_cb *cb) { TCGv_ptr ptr = gen_plugin_u64_ptr(cb->inline_insn.entry); @@ -186,6 +231,9 @@ static void inject_cb(struct qemu_plugin_dyn_cb *cb) case PLUGIN_CB_REGULAR: gen_udata_cb(cb); break; + case PLUGIN_CB_COND: + gen_udata_cond_cb(cb); + break; case PLUGIN_CB_INLINE_ADD_U64: gen_inline_add_u64_cb(cb); break; diff --git a/plugins/api.c b/plugins/api.c index 3912c9cc8f6..2242d40bbbc 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -96,6 +96,25 @@ void qemu_plugin_register_vcpu_tb_exec_cb(struct qemu_plugin_tb *tb, } } +void qemu_plugin_register_vcpu_tb_exec_cond_cb(struct qemu_plugin_tb *tb, + qemu_plugin_vcpu_udata_cb_t cb, + enum qemu_plugin_cb_flags flags, + enum qemu_plugin_cond cond, + qemu_plugin_u64 entry, + uint64_t imm, + void *udata) +{ + if (cond == QEMU_PLUGIN_COND_NEVER || tb->mem_only) { + return; + } + if (cond == QEMU_PLUGIN_COND_ALWAYS) { + qemu_plugin_register_vcpu_tb_exec_cb(tb, cb, flags, udata); + return; + } + plugin_register_dyn_cond_cb__udata(&tb->cbs, cb, flags, + cond, entry, imm, udata); +} + void qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu( struct qemu_plugin_tb *tb, enum qemu_plugin_op op, @@ -117,6 +136,26 @@ void qemu_plugin_register_vcpu_insn_exec_cb(struct qemu_plugin_insn *insn, } } +void qemu_plugin_register_vcpu_insn_exec_cond_cb( + struct qemu_plugin_insn *insn, + qemu_plugin_vcpu_udata_cb_t cb, + enum qemu_plugin_cb_flags flags, + enum qemu_plugin_cond cond, + qemu_plugin_u64 entry, + uint64_t imm, + void *udata) +{ + if (cond == QEMU_PLUGIN_COND_NEVER || insn->mem_only) { + return; + } + if (cond == QEMU_PLUGIN_COND_ALWAYS) { + qemu_plugin_register_vcpu_insn_exec_cb(insn, cb, flags, udata); + return; + } + plugin_register_dyn_cond_cb__udata(&insn->insn_cbs, cb, flags, + cond, entry, imm, udata); +} + void qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu( struct qemu_plugin_insn *insn, enum qemu_plugin_op op, diff --git a/plugins/core.c b/plugins/core.c index e1bf0dc3717..b3d0208e022 100644 --- a/plugins/core.c +++ b/plugins/core.c @@ -371,6 +371,38 @@ void plugin_register_dyn_cb__udata(GArray **arr, dyn_cb->regular.info = &info[flags]; } +void plugin_register_dyn_cond_cb__udata(GArray **arr, + qemu_plugin_vcpu_udata_cb_t cb, + enum qemu_plugin_cb_flags flags, + enum qemu_plugin_cond cond, + qemu_plugin_u64 entry, + uint64_t imm, + void *udata) +{ + static TCGHelperInfo info[3] = { + [QEMU_PLUGIN_CB_NO_REGS].flags = TCG_CALL_NO_RWG, + [QEMU_PLUGIN_CB_R_REGS].flags = TCG_CALL_NO_WG, + /* + * Match qemu_plugin_vcpu_udata_cb_t: + * void (*)(uint32_t, void *) + */ + [0 ... 2].typemask = (dh_typemask(void, 0) | + dh_typemask(i32, 1) | + dh_typemask(ptr, 2)) + }; + + struct qemu_plugin_dyn_cb *dyn_cb = plugin_get_dyn_cb(arr); + dyn_cb->userp = udata; + dyn_cb->type = PLUGIN_CB_COND; + dyn_cb->cond.f.vcpu_udata = cb; + dyn_cb->cond.cond = cond; + dyn_cb->cond.entry = entry; + dyn_cb->cond.imm = imm; + + assert((unsigned)flags < ARRAY_SIZE(info)); + dyn_cb->cond.info = &info[flags]; +} + void plugin_register_vcpu_mem_cb(GArray **arr, void *cb, enum qemu_plugin_cb_flags flags, diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols index a9fac056c7f..aa0a77a319f 100644 --- a/plugins/qemu-plugins.symbols +++ b/plugins/qemu-plugins.symbols @@ -27,6 +27,7 @@ qemu_plugin_register_vcpu_idle_cb; qemu_plugin_register_vcpu_init_cb; qemu_plugin_register_vcpu_insn_exec_cb; + qemu_plugin_register_vcpu_insn_exec_cond_cb; qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu; qemu_plugin_register_vcpu_mem_cb; qemu_plugin_register_vcpu_mem_inline_per_vcpu; @@ -34,6 +35,7 @@ qemu_plugin_register_vcpu_syscall_cb; qemu_plugin_register_vcpu_syscall_ret_cb; qemu_plugin_register_vcpu_tb_exec_cb; + qemu_plugin_register_vcpu_tb_exec_cond_cb; qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu; qemu_plugin_register_vcpu_tb_trans_cb; qemu_plugin_reset;