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Wed, 26 Jun 2024 16:13:03 -0700 (PDT) Received: from linaro.vn.shawcable.net ([2604:3d08:9384:1d00::2193]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1faac82cd3bsm478215ad.0.2024.06.26.16.13.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jun 2024 16:13:02 -0700 (PDT) From: Pierrick Bouvier To: qemu-devel@nongnu.org Cc: Pierrick Bouvier , Mahmoud Mandour , Paolo Bonzini , Eduardo Habkost , Richard Henderson , Alexandre Iooss , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , =?utf-8?q?Alex?= =?utf-8?q?_Benn=C3=A9e?= Subject: [PATCH 3/7] plugins: extend API to get latest memory value accessed Date: Wed, 26 Jun 2024 16:12:51 -0700 Message-Id: <20240626231255.339353-4-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240626231255.339353-1-pierrick.bouvier@linaro.org> References: <20240626231255.339353-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::635; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pl1-x635.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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Two functions are added to plugins API: - qemu_plugin_mem_get_value_upper_bits - qemu_plugin_mem_get_value_lower_bits This value can be accessed only during a memory callback. Signed-off-by: Pierrick Bouvier --- include/qemu/qemu-plugin.h | 20 ++++++++++++++++++++ plugins/api.c | 21 +++++++++++++++++++++ plugins/qemu-plugins.symbols | 2 ++ 3 files changed, 43 insertions(+) diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index c71c705b699..5945f256949 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -551,6 +551,26 @@ bool qemu_plugin_mem_is_big_endian(qemu_plugin_meminfo_t info); QEMU_PLUGIN_API bool qemu_plugin_mem_is_store(qemu_plugin_meminfo_t info); +/** + * qemu_plugin_mem_get_value_lower_bits() - return 64 lower bits of latest + * accessed memory value + * @info: opaque memory transaction handle + * + * Returns: lower bits for value accessed + */ +QEMU_PLUGIN_API +uint64_t qemu_plugin_mem_get_value_lower_bits(qemu_plugin_meminfo_t info); + +/** + * qemu_plugin_mem_get_value_upper_bits() - return 64 upper bits of latest + * accessed memory value + * @info: opaque memory transaction handle + * + * Returns: upper bits for value accessed + */ +QEMU_PLUGIN_API +uint64_t qemu_plugin_mem_get_value_upper_bits(qemu_plugin_meminfo_t info); + /** * qemu_plugin_get_hwaddr() - return handle for memory operation * @info: opaque memory info structure diff --git a/plugins/api.c b/plugins/api.c index 2ff13d09de6..89e9f6ba5b4 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -351,6 +351,27 @@ bool qemu_plugin_mem_is_store(qemu_plugin_meminfo_t info) return get_plugin_meminfo_rw(info) & QEMU_PLUGIN_MEM_W; } +uint64_t qemu_plugin_mem_get_value_upper_bits(qemu_plugin_meminfo_t info) +{ + return current_cpu->plugin_state->mem_value_upper_bits; +} + +uint64_t qemu_plugin_mem_get_value_lower_bits(qemu_plugin_meminfo_t info) +{ + uint64_t value = current_cpu->plugin_state->mem_value_lower_bits; + /* tcg values are sign extended, so we must clip them */ + switch (qemu_plugin_mem_size_shift(info)) { + case 0: + return value & 0xff; + case 1: + return value & 0xffff; + case 2: + return value & 0xffffffff; + default: + return value; + } +} + /* * Virtual Memory queries */ diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols index ca773d8d9fe..9f2646fc812 100644 --- a/plugins/qemu-plugins.symbols +++ b/plugins/qemu-plugins.symbols @@ -13,6 +13,8 @@ qemu_plugin_insn_size; qemu_plugin_insn_symbol; qemu_plugin_insn_vaddr; + qemu_plugin_mem_get_value_upper_bits; + qemu_plugin_mem_get_value_lower_bits; qemu_plugin_mem_is_big_endian; qemu_plugin_mem_is_sign_extended; qemu_plugin_mem_is_store;