[{"id":3499579,"web_url":"http://patchwork.ozlabs.org/comment/3499579/","msgid":"","list_archive_url":null,"date":"2025-04-22T06:43:09","subject":"Re: [PATCH v2 11/20] util/cacheflush.c: Update cache flushing\n mechanism for Emscripten","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/people/85046/","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"content":"On 22/4/25 07:27, Kohei Tokunaga wrote:\n> Although __builtin___clear_cache is used to flush the instruction cache for\n> a specified memory region[1], this operation doesn't apply to wasm, as its\n> memory isn't executable. Moreover, Emscripten does not support this builtin\n> and fails to compile it with the following error.\n> \n>> fatal error: error in backend: llvm.clear_cache is not supported on wasm\n> \n> To resolve this, this commit removes the call to __builtin___clear_cache for\n> Emscripten build.\n> \n> [1] https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005f_005f_005fclear_005fcache\n> \n> Signed-off-by: Kohei Tokunaga \n> ---\n> include/qemu/cacheflush.h | 7 +++++++\n> util/cacheflush.c | 4 ++++\n> 2 files changed, 11 insertions(+)\n\nReviewed-by: Philippe Mathieu-Daudé ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=rKr9IiGK;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::434;\n envelope-from=philmd@linaro.org; helo=mail-wr1-x434.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,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=unavailable 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3499584,"web_url":"http://patchwork.ozlabs.org/comment/3499584/","msgid":"","list_archive_url":null,"date":"2025-04-22T06:48:34","subject":"Re: [PATCH v2 11/20] util/cacheflush.c: Update cache flushing\n mechanism for Emscripten","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/people/85046/","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"content":"On 22/4/25 07:27, Kohei Tokunaga wrote:\n> Although __builtin___clear_cache is used to flush the instruction cache for\n> a specified memory region[1], this operation doesn't apply to wasm, as its\n> memory isn't executable. Moreover, Emscripten does not support this builtin\n> and fails to compile it with the following error.\n> \n>> fatal error: error in backend: llvm.clear_cache is not supported on wasm\n\nNote, you mix LLVM error ...\n\n> \n> To resolve this, this commit removes the call to __builtin___clear_cache for\n> Emscripten build.\n> \n> [1] https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005f_005f_005fclear_005fcache\n\n... with this GCC documentation:\n\n If the target does not require instruction cache flushes,\n __builtin___clear_cache has no effect.\n\nI'd expect __builtin___clear_cache() to be OK, having no effect on a GCC\nWASM implementation.\n\n> \n> Signed-off-by: Kohei Tokunaga \n> ---\n> include/qemu/cacheflush.h | 7 +++++++\n> util/cacheflush.c | 4 ++++\n> 2 files changed, 11 insertions(+)","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=zEvhTst2;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::42b;\n envelope-from=philmd@linaro.org; helo=mail-wr1-x42b.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,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=unavailable 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3500405,"web_url":"http://patchwork.ozlabs.org/comment/3500405/","msgid":"","list_archive_url":null,"date":"2025-04-23T06:01:30","subject":"Re: [PATCH v2 11/20] util/cacheflush.c: Update cache flushing\n mechanism for Emscripten","submitter":{"id":90637,"url":"http://patchwork.ozlabs.org/api/people/90637/","name":"Kohei Tokunaga","email":"ktokunaga.mail@gmail.com"},"content":"Hi Philippe,\n\n>On 22/4/25 07:27, Kohei Tokunaga wrote:\n>> Although __builtin___clear_cache is used to flush the instruction cache\nfor\n>> a specified memory region[1], this operation doesn't apply to wasm, as\nits\n>> memory isn't executable. Moreover, Emscripten does not support this\nbuiltin\n>> and fails to compile it with the following error.\n>>\n>>> fatal error: error in backend: llvm.clear_cache is not supported on wasm\n>\n>Note, you mix LLVM error ...\n>\n>>\n>> To resolve this, this commit removes the call to __builtin___clear_cache\nfor\n>> Emscripten build.\n>>\n>> [1]\nhttps://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005f_005f_005fclear_005fcache\n>\n>... with this GCC documentation:\n>\n> If the target does not require instruction cache flushes,\n> __builtin___clear_cache has no effect.\n>\n>I'd expect __builtin___clear_cache() to be OK, having no effect on a GCC\n>WASM implementation.\n\nThank you for the feedback.\nAlthough Emscripten supports built-in functions using GCC-compatible syntax,\nthe corner-case behavior looks different from what's described in the GCC\ndocumentation, as shown in this patch. To avoid the confusion, I'll remove\nthat link in the next version of the patch series.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=l9G/iqTh;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4Zj7m15Jn6z1yMt\n\tfor ; Wed, 23 Apr 2025 16:01:53 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1u7TB9-0008WT-Ip; 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Tue, 22 Apr 2025\n 23:01:43 -0700 (PDT)","MIME-Version":"1.0","References":"\n <73301cc216217d5c3e0d7acdd32482e36f4f045c.1745295397.git.ktokunaga.mail@gmail.com>\n ","In-Reply-To":"","From":"Kohei Tokunaga ","Date":"Wed, 23 Apr 2025 15:01:30 +0900","X-Gm-Features":"ATxdqUEgMiBMXQqp1DS_p2pUXzotO2Zb8dScDj2LI8F234aM8mnRYFR9cYzrLXk","Message-ID":"\n ","Subject":"Re: [PATCH v2 11/20] util/cacheflush.c: Update cache flushing\n mechanism for Emscripten","To":"=?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= ,\n qemu-devel@nongnu.org","Cc":"=?utf-8?q?Alex_Benn=C3=A9e?= ,\n Thomas Huth , Kevin Wolf ,\n Hanna Reitz , Paolo Bonzini ,\n Alexandre Iooss ,\n Mahmoud Mandour ,\n Pierrick Bouvier ,\n Pavel Pisa ,\n Francisco Iglesias ,\n Vikram Garhwal ,\n Jason Wang ,\n =?utf-8?q?Marc-Andr=C3=A9_Lureau?= ,\n\t=?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= ,\n Eduardo Habkost , Peter Xu ,\n David Hildenbrand ,\n Peter Maydell , Zhao Liu ,\n Nicholas Piggin ,\n Daniel Henrique Barboza ,\n Richard Henderson ,\n Ilya Leoshkevich , Stefan Hajnoczi ,\n qemu-block@nongnu.org, qemu-arm@nongnu.org, qemu-ppc@nongnu.org,\n qemu-s390x@nongnu.org","Content-Type":"multipart/alternative; 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