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Tue, 22 Oct 2024 04:03:55 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: Beraldo Leal , Laurent Vivier , Wainer dos Santos Moschetta , Mahmoud Mandour , Jiaxun Yang , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Yanan Wang , Thomas Huth , John Snow , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , qemu-arm@nongnu.org, =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Eduardo Habkost , devel@lists.libvirt.org, Cleber Rosa , kvm@vger.kernel.org, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Alexandre Iooss , Peter Maydell , Richard Henderson , Riku Voipio , Zhao Liu , Marcelo Tosatti , "Edgar E. Iglesias" , Marcel Apfelbaum , Pierrick Bouvier , Paolo Bonzini , Robbin Ehn Subject: [PATCH v2 20/20] plugins: fix qemu_plugin_reset Date: Tue, 22 Oct 2024 11:56:14 +0100 Message-Id: <20241022105614.839199-21-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241022105614.839199-1-alex.bennee@linaro.org> References: <20241022105614.839199-1-alex.bennee@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=2a00:1450:4864:20::131; envelope-from=alex.bennee@linaro.org; helo=mail-lf1-x131.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: 1729595137508116600 From: Pierrick Bouvier 34e5e1 refactored the plugin context initialization. After this change, tcg_ctx->plugin_insn is not reset inconditionnally anymore, but only if one plugin at least is active. When uninstalling the last plugin active, we stopped reinitializing tcg_ctx->plugin_insn, which leads to memory callbacks being emitted. This results in an error as they don't appear in a plugin op sequence as expected. The correct fix is to make sure we reset plugin translation variables after current block translation ends. This way, we can catch any potential misuse of those after a given block, in more than fixing the current bug. Fixes: https://gitlab.com/qemu-project/qemu/-/issues/2570 Reviewed-by: Richard Henderson Signed-off-by: Pierrick Bouvier Tested-by: Robbin Ehn Message-Id: <20241015003819.984601-1-pierrick.bouvier@linaro.org> [AJB: trim patch version details from commit msg] Signed-off-by: Alex Benn=C3=A9e --- accel/tcg/plugin-gen.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/accel/tcg/plugin-gen.c b/accel/tcg/plugin-gen.c index 2ee4c22bef..0f47bfbb48 100644 --- a/accel/tcg/plugin-gen.c +++ b/accel/tcg/plugin-gen.c @@ -467,4 +467,8 @@ void plugin_gen_tb_end(CPUState *cpu, size_t num_insns) =20 /* inject the instrumentation at the appropriate places */ plugin_gen_inject(ptb); + + /* reset plugin translation state (plugin_tb is reused between blocks)= */ + tcg_ctx->plugin_db =3D NULL; + tcg_ctx->plugin_insn =3D NULL; } --=20 2.39.5