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Tue, 10 Sep 2024 10:40:22 -0700 (PDT) From: Pierrick Bouvier To: qemu-devel@nongnu.org Cc: Wainer dos Santos Moschetta , Richard Henderson , Paolo Bonzini , Ilya Leoshkevich , =?UTF-8?q?Alex=20Benn=C3=A9e?= , David Hildenbrand , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , kvm@vger.kernel.org, Thomas Huth , Marcelo Tosatti , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , qemu-s390x@nongnu.org, Beraldo Leal , Pierrick Bouvier Subject: [PATCH v3 1/3] meson: hide tsan related warnings Date: Tue, 10 Sep 2024 10:40:11 -0700 Message-Id: <20240910174013.1433331-2-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240910174013.1433331-1-pierrick.bouvier@linaro.org> References: <20240910174013.1433331-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=2607:f8b0:4864:20::102b; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pj1-x102b.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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1725990146072116600 When building with gcc-12 -fsanitize=3Dthread, gcc reports some constructions not supported with tsan. Found on debian stable. qemu/include/qemu/atomic.h:36:52: error: =E2=80=98atomic_thread_fence=E2=80= =99 is not supported with =E2=80=98-fsanitize=3Dthread=E2=80=99 [-Werror=3D= tsan] 36 | #define smp_mb() ({ barrier(); __atomic_thread_= fence(__ATOMIC_SEQ_CST); }) | ^~~~~~~~~~~~~~~~= ~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Pierrick Bouvier Reviewed-by: Thomas Huth --- meson.build | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/meson.build b/meson.build index fbda17c987e..8a587bd52cc 100644 --- a/meson.build +++ b/meson.build @@ -504,7 +504,15 @@ if get_option('tsan') prefix: '#include ') error('Cannot enable TSAN due to missing fiber annotation interface') endif - qemu_cflags =3D ['-fsanitize=3Dthread'] + qemu_cflags + tsan_warn_suppress =3D [] + # gcc (>=3D11) will report constructions not supported by tsan: + # "error: =E2=80=98atomic_thread_fence=E2=80=99 is not supported with = =E2=80=98-fsanitize=3Dthread=E2=80=99" + # https://gcc.gnu.org/gcc-11/changes.html + # However, clang does not support this warning and this triggers an erro= r. + if cc.has_argument('-Wno-tsan') + tsan_warn_suppress =3D ['-Wno-tsan'] + endif + qemu_cflags =3D ['-fsanitize=3Dthread'] + tsan_warn_suppress + qemu_cfla= gs qemu_ldflags =3D ['-fsanitize=3Dthread'] + qemu_ldflags endif =20 --=20 2.39.2 From nobody Sun Nov 24 05:24:40 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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Tue, 10 Sep 2024 10:40:24 -0700 (PDT) From: Pierrick Bouvier To: qemu-devel@nongnu.org Cc: Wainer dos Santos Moschetta , Richard Henderson , Paolo Bonzini , Ilya Leoshkevich , =?UTF-8?q?Alex=20Benn=C3=A9e?= , David Hildenbrand , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , kvm@vger.kernel.org, Thomas Huth , Marcelo Tosatti , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , qemu-s390x@nongnu.org, Beraldo Leal , Pierrick Bouvier Subject: [PATCH v3 2/3] target/i386: fix build warning (gcc-12 -fsanitize=thread) Date: Tue, 10 Sep 2024 10:40:12 -0700 Message-Id: <20240910174013.1433331-3-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240910174013.1433331-1-pierrick.bouvier@linaro.org> References: <20240910174013.1433331-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=2607:f8b0:4864:20::1034; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pj1-x1034.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=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: , 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: 1725990045685116600 Found on debian stable. ../target/i386/kvm/kvm.c: In function =E2=80=98kvm_handle_rdmsr=E2=80=99: ../target/i386/kvm/kvm.c:5345:1: error: control reaches end of non-void fun= ction [-Werror=3Dreturn-type] 5345 | } | ^ ../target/i386/kvm/kvm.c: In function =E2=80=98kvm_handle_wrmsr=E2=80=99: ../target/i386/kvm/kvm.c:5364:1: error: control reaches end of non-void fun= ction [-Werror=3Dreturn-type] 5364 | } Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson Signed-off-by: Pierrick Bouvier Reviewed-by: Thomas Huth --- target/i386/kvm/kvm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 2fa88ef1e37..308b0e1cb37 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -5770,7 +5770,7 @@ static int kvm_handle_rdmsr(X86CPU *cpu, struct kvm_r= un *run) } } =20 - assert(false); + g_assert_not_reached(); } =20 static int kvm_handle_wrmsr(X86CPU *cpu, struct kvm_run *run) @@ -5789,7 +5789,7 @@ static int kvm_handle_wrmsr(X86CPU *cpu, struct kvm_r= un *run) } } =20 - assert(false); + g_assert_not_reached(); } =20 static bool has_sgx_provisioning; --=20 2.39.2 From nobody Sun Nov 24 05:24:40 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1725990102; cv=none; d=zohomail.com; s=zohoarc; b=mfsrgp7poBDeYRGyr1QDYd1ijhXwxvzULyQxrq9UiBxgca843zk77qU5VWOzGPjGQO1xkbnggWWcUBLspDv/m4ix1tgNayayGxfFMgvhSZDuVLHsndts8rE7zVkGPpNd923Qh7HPMUTD1U9GYO32SUJIT3EuthJ76jJEWRxpdik= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1725990102; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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Tue, 10 Sep 2024 10:40:25 -0700 (PDT) From: Pierrick Bouvier To: qemu-devel@nongnu.org Cc: Wainer dos Santos Moschetta , Richard Henderson , Paolo Bonzini , Ilya Leoshkevich , =?UTF-8?q?Alex=20Benn=C3=A9e?= , David Hildenbrand , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , kvm@vger.kernel.org, Thomas Huth , Marcelo Tosatti , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , qemu-s390x@nongnu.org, Beraldo Leal , Pierrick Bouvier Subject: [PATCH v3 3/3] docs/devel: update tsan build documentation Date: Tue, 10 Sep 2024 10:40:13 -0700 Message-Id: <20240910174013.1433331-4-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240910174013.1433331-1-pierrick.bouvier@linaro.org> References: <20240910174013.1433331-1-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=2607:f8b0:4864:20::52f; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pg1-x52f.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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1725990104205116600 Content-Type: text/plain; charset="utf-8" Mention it's now possible to build with gcc, instead of clang, and explain how to build a sanitized glib version. Signed-off-by: Pierrick Bouvier Reviewed-by: Thomas Huth --- docs/devel/testing/main.rst | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/docs/devel/testing/main.rst b/docs/devel/testing/main.rst index e9921a4b10a..2e57390d990 100644 --- a/docs/devel/testing/main.rst +++ b/docs/devel/testing/main.rst @@ -634,20 +634,38 @@ Building and Testing with TSan It is possible to build and test with TSan, with a few additional steps. These steps are normally done automatically in the docker. =20 -There is a one time patch needed in clang-9 or clang-10 at this time: +TSan is supported for clang and gcc. +One particularity of sanitizers is that all the code, including shared obj= ects +dependencies, should be built with it. +In the case of TSan, any synchronization primitive from glib (GMutex for +instance) will not be recognized, and will lead to false positives. + +To build a tsan version of glib: =20 .. code:: =20 - sed -i 's/^const/static const/g' \ - /usr/lib/llvm-10/lib/clang/10.0.0/include/sanitizer/tsan_interface.h + $ git clone --depth=3D1 --branch=3D2.81.0 https://github.com/GNOME/glib= .git + $ cd glib + $ CFLAGS=3D"-O2 -g -fsanitize=3Dthread" meson build + $ ninja -C build =20 To configure the build for TSan: =20 .. code:: =20 - ../configure --enable-tsan --cc=3Dclang-10 --cxx=3Dclang++-10 \ + ../configure --enable-tsan \ --disable-werror --extra-cflags=3D"-O0" =20 +When executing qemu, don't forget to point to tsan glib: + +.. code:: + + $ glib_dir=3D/path/to/glib + $ export LD_LIBRARY_PATH=3D$glib_dir/build/gio:$glib_dir/build/glib:$gl= ib_dir/build/gmodule:$glib_dir/build/gobject:$glib_dir/build/gthread + # check correct version is used + $ ldd build/qemu-x86_64 | grep glib + $ qemu-system-x86_64 ... + The runtime behavior of TSAN is controlled by the TSAN_OPTIONS environment variable. =20 --=20 2.39.2