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[209.51.188.17]) by mx.google.com with ESMTPS id f7si20088872ybb.37.2021.02.09.10.35.39 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 09 Feb 2021 10:35:39 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b="w1hOVB/s"; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:50332 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l9XrP-0003Ys-6w for patch@linaro.org; Tue, 09 Feb 2021 13:35:39 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:43416) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l9Xk9-0003Fr-Jw for qemu-devel@nongnu.org; Tue, 09 Feb 2021 13:28:09 -0500 Received: from mail-wr1-x42f.google.com ([2a00:1450:4864:20::42f]:36397) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1l9Xk7-0007rl-V4 for qemu-devel@nongnu.org; Tue, 09 Feb 2021 13:28:09 -0500 Received: by mail-wr1-x42f.google.com with SMTP id u14so23265242wri.3 for ; Tue, 09 Feb 2021 10:28:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=egNb1Ho5wTfDlHsUr/B5unXhMEO0vBcjIkXluBAwDPY=; b=w1hOVB/s/vDvQ76fvHe3Mbf/VoMG5VTufjOolPoykVN/I/8fu2zKzbEqVzBWCO5YjW wbX8vJA4A8C2ZPHYMTLrJUPXPGU81lyMFheNtKpxE63CpuT1CerKpcTTzLPLZ4twQDu0 HuA9aCDnIPKPCL4FeQDrXyx/wYMRv9knzVlnuZOj9GcDtogELMaTc9HqgkbwGJrQ3+li uHx88iSWtvpJ0n5n7hB3O8VO6QqDO5Uf26LerIwEPbSGxVsG4bY0V83CC4YcyL+6S4oO HCJyalwACJO8LkqrMsZfETvH4AsAqeAnzB7iaL7Yt6HU8HF65WO9ukNXtSuininpFklx 4ADA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=egNb1Ho5wTfDlHsUr/B5unXhMEO0vBcjIkXluBAwDPY=; b=f6fnXHjmJPdA8Q4vwuPIeUC20TY4/dl+dkUYC5aVDq+/zQpw4knKkG0KEQQqruhDkz Icrku3Qv932RxVUtPQMWq8uWmQn8eGTumXDBOO283HspW3EvOTK53ragjNptt9HDpevB fkM9K/EUYD80mMsEpqecoau5gJUI5x7EFilO6tgO/GGC2RvHlQlyv2EKyia2VJubv4ea vZGWUU3KT1so3HbLrjxFoLJ3cXdSK3ix4F7rQSu+nU4BGcijc17c06G0+eMZmn+ZJu17 /zhTwKeYm4SERyD262STh0ewtbiuq/APrkpntAIHKfEM49pD3JwxwJi4fqfzzy7IpmVX TPjQ== X-Gm-Message-State: AOAM531POtLl00oXMZMP+KzjHka6bYeXGjuPiEUdazUopaZGtFQzsAY3 HM3oaoUIXxbxla/ueeTw9KC0Xw== X-Received: by 2002:adf:a1d6:: with SMTP id v22mr18444568wrv.372.1612895286553; Tue, 09 Feb 2021 10:28:06 -0800 (PST) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id b13sm16305808wrs.35.2021.02.09.10.27.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Feb 2021 10:27:57 -0800 (PST) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id 2170B1FF7E; Tue, 9 Feb 2021 18:27:51 +0000 (GMT) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: qemu-devel@nongnu.org Subject: [PATCH v1 08/12] accel/tcg: cache single instruction TB on pending replay exception Date: Tue, 9 Feb 2021 18:27:44 +0000 Message-Id: <20210209182749.31323-9-alex.bennee@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210209182749.31323-1-alex.bennee@linaro.org> References: <20210209182749.31323-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::42f; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x42f.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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Henderson , robhenry@microsoft.com, aaron@os.amperecomputing.com, cota@braap.org, Paolo Bonzini , kuhn.chenqun@huawei.com, =?utf-8?q?Alex_Benn?= =?utf-8?b?w6ll?= Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Again there is no reason to jump through the nocache hoops to execute a single instruction block. We do have to add an additional wrinkle to the cpu_handle_interrupt case to ensure we let through a TB where we have specifically disabled icount for the block. As the last user of cpu_exec_nocache we can now remove the function. Further clean-up will follow in subsequent patches. Signed-off-by: Alex Bennée --- accel/tcg/cpu-exec.c | 44 ++++---------------------------------------- 1 file changed, 4 insertions(+), 40 deletions(-) -- 2.20.1 diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index 7f477af891..609a68a3ae 100644 --- a/accel/tcg/cpu-exec.c +++ b/accel/tcg/cpu-exec.c @@ -224,40 +224,6 @@ cpu_tb_exec(CPUState *cpu, TranslationBlock *itb, int *tb_exit) return last_tb; } -#ifndef CONFIG_USER_ONLY -/* Execute the code without caching the generated code. An interpreter - could be used if available. */ -static void cpu_exec_nocache(CPUState *cpu, int max_cycles, - TranslationBlock *orig_tb, bool ignore_icount) -{ - TranslationBlock *tb; - uint32_t cflags = curr_cflags() | CF_NOCACHE; - int tb_exit; - - if (ignore_icount) { - cflags &= ~CF_USE_ICOUNT; - } - - /* Should never happen. - We only end up here when an existing TB is too long. */ - cflags |= MIN(max_cycles, CF_COUNT_MASK); - - mmap_lock(); - tb = tb_gen_code(cpu, orig_tb->pc, orig_tb->cs_base, - orig_tb->flags, cflags); - tb->orig_tb = orig_tb; - mmap_unlock(); - - /* execute the generated code */ - trace_exec_tb_nocache(tb, tb->pc); - cpu_tb_exec(cpu, tb, &tb_exit); - - mmap_lock(); - tb_phys_invalidate(tb, -1); - mmap_unlock(); - tcg_tb_remove(tb); -} -#endif static void cpu_exec_enter(CPUState *cpu) { @@ -524,15 +490,12 @@ static inline bool cpu_handle_exception(CPUState *cpu, int *ret) #ifndef CONFIG_USER_ONLY if (replay_has_exception() && cpu_neg(cpu)->icount_decr.u16.low + cpu->icount_extra == 0) { - /* try to cause an exception pending in the log */ - cpu_exec_nocache(cpu, 1, tb_find(cpu, NULL, 0, curr_cflags()), true); + /* Execute just one insn to trigger exception pending in the log */ + cpu->cflags_next_tb = (curr_cflags() & ~CF_USE_ICOUNT) | 1; } #endif - if (cpu->exception_index < 0) { - return false; - } + return false; } - if (cpu->exception_index >= EXCP_INTERRUPT) { /* exit request from the cpu execution loop */ *ret = cpu->exception_index; @@ -688,6 +651,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu, /* Finally, check if we need to exit to the main loop. */ if (unlikely(qatomic_read(&cpu->exit_request)) || (icount_enabled() + && (cpu->cflags_next_tb == -1 || cpu->cflags_next_tb & CF_USE_ICOUNT) && cpu_neg(cpu)->icount_decr.u16.low + cpu->icount_extra == 0)) { qatomic_set(&cpu->exit_request, 0); if (cpu->exception_index == -1) {