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[209.51.188.17]) by mx.google.com with ESMTPS id l62si2714469ybl.20.2021.02.18.02.08.27 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Thu, 18 Feb 2021 02:08:27 -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=izphmsXo; 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]:59776 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lCgEU-0006Lf-Qu for patch@linaro.org; Thu, 18 Feb 2021 05:08:26 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:54336) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lCfzY-0004ZR-5g for qemu-devel@nongnu.org; Thu, 18 Feb 2021 04:53:00 -0500 Received: from mail-wm1-x32a.google.com ([2a00:1450:4864:20::32a]:33981) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lCfzV-00010u-Sj for qemu-devel@nongnu.org; Thu, 18 Feb 2021 04:52:59 -0500 Received: by mail-wm1-x32a.google.com with SMTP id o10so2467088wmc.1 for ; Thu, 18 Feb 2021 01:52:53 -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=J6t14fMjlWmSY/RcG379H0HP4pomUYB2uffBkdEK/6Q=; b=izphmsXo7OXrSTLSBHORTYyLDWuYsC6pTIsYQ3hvT079fUIzJFwo5Zks5JT+/6KQRo l2wNdqUzgrdP2Kto9GBtcG3Tt45GhkvEyJdNk+30o+vCDh7kWQNFI6juaGPfLmODE6zD 6V+e0wKSF/Bx71ZdK9IQnx2ggR8B1Kz05WG/spKASXOR1eM8PXKNSfkrrDMxZ0lSDbfT jai5rUKcvCgxxKz2nW7Qwc7gdipuZX7qloDlwwNOHXP8LmER4IFSV9vOqzePPeh9a6x3 g1UDO+x/MEp9qujyRYdfww8XUyIM/zHXJFM6oAcK6owjlAIPo03asN7vKZLzHvaLnaje UjiQ== 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=J6t14fMjlWmSY/RcG379H0HP4pomUYB2uffBkdEK/6Q=; b=dBkrWb/h2AgMAvlAfv7fcZrFWJ/mvhngW0JxInnIghiyCsnuMCMQAVGD0VON9NcVjp wq45KuB6G5orercBPOjbuLpZ2cBbesGBp45Tx7mw7NTNqU0ulLvg3LLwDNIstG3ITXii rHvm4YgOHhAmiQCCY4tqV4YYEFt3c9wBE39tXTlHDxRD9vJmx9SdXZI3eIxZjm0WmAvV 0FTOTkpJfKVTzsEIH0ZTVp1rzQZY5MASKRPV7HV7VGcMRhExSVeTmQOpQAZdY7rMOHHS xDs8B0JO2dOW46fTQGRnLAJkkIbS3K6XTwPJkzkoJphpZjrZww63ThWrT6t78mvHFzQo uvaQ== X-Gm-Message-State: AOAM530XHZDrzq7Rmvx/skZhybqzaSa6o+BL8RuHjRXCcqJHD4LRvG15 NRWJEfkkC8bh2QbMtvgE+sD0+w== X-Received: by 2002:a1c:98ce:: with SMTP id a197mr2735622wme.120.1613641972715; Thu, 18 Feb 2021 01:52:52 -0800 (PST) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id y4sm1837680wrs.66.2021.02.18.01.52.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Feb 2021 01:52:46 -0800 (PST) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id 952D41FFA5; Thu, 18 Feb 2021 09:47:08 +0000 (GMT) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: peter.maydell@linaro.org Subject: [PULL 17/23] accel/tcg: cache single instruction TB on pending replay exception Date: Thu, 18 Feb 2021 09:47:00 +0000 Message-Id: <20210218094706.23038-18-alex.bennee@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210218094706.23038-1-alex.bennee@linaro.org> References: <20210218094706.23038-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::32a; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x32a.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 , =?utf-8?q?Alex_Benn?= =?utf-8?b?w6ll?= , qemu-devel@nongnu.org, Paolo Bonzini 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 Reviewed-by: Richard Henderson Message-Id: <20210213130325.14781-18-alex.bennee@linaro.org> -- 2.20.1 diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index d24c1bdb74..16e4fe3ccd 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) {