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Tue, 27 Aug 2024 14:53:31 -0700 (PDT) From: Rowan Hart To: qemu-devel@nongnu.org Cc: Pierrick Bouvier , Alexandre Iooss , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Mahmoud Mandour , Rowan Hart Subject: [PATCH v3 1/2] plugins: add plugin API to read guest memory Date: Tue, 27 Aug 2024 14:53:28 -0700 Message-ID: <20240827215329.248434-2-rowanbhart@gmail.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240827215329.248434-1-rowanbhart@gmail.com> References: <20240827215329.248434-1-rowanbhart@gmail.com> 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::102b; envelope-from=rowanbhart@gmail.com; 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 @gmail.com) X-ZM-MESSAGEID: 1724795663391116600 Content-Type: text/plain; charset="utf-8" Signed-off-by: Rowan Hart Reviewed-by: Pierrick Bouvier --- include/qemu/qemu-plugin.h | 32 +++++++++++++++++++++++++++++++- plugins/api.c | 20 ++++++++++++++++++++ plugins/qemu-plugins.symbols | 1 + 3 files changed, 52 insertions(+), 1 deletion(-) diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index c71c705b69..e4068f823b 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -57,11 +57,19 @@ typedef uint64_t qemu_plugin_id_t; * - Remove qemu_plugin_register_vcpu_{tb, insn, mem}_exec_inline. * Those functions are replaced by *_per_vcpu variants, which guarantee * thread-safety for operations. + * + * version 3: + * - modified arguments and return value of qemu_plugin_insn_data to copy + * the data into a user-provided buffer instead of returning a pointer + * to the data. + * + * version 4: + * - added qemu_plugin_read_memory_vaddr */ =20 extern QEMU_PLUGIN_EXPORT int qemu_plugin_version; =20 -#define QEMU_PLUGIN_VERSION 3 +#define QEMU_PLUGIN_VERSION 4 =20 /** * struct qemu_info_t - system information for plugins @@ -852,6 +860,28 @@ typedef struct { QEMU_PLUGIN_API GArray *qemu_plugin_get_registers(void); =20 +/** + * qemu_plugin_read_memory_vaddr() - read from memory using a virtual addr= ess + * + * @addr: A virtual address to read from + * @data: A byte array to store data into + * @len: The number of bytes to read, starting from @addr + * + * @len bytes of data is read starting at @addr and stored into @data. If = @data + * is not large enough to hold @len bytes, it will be expanded to the nece= ssary + * size, reallocating if necessary. @len must be greater than 0. + * + * This function does not ensure writes are flushed prior to reading, so + * callers should take care when calling this function in plugin callbacks= to + * avoid attempting to read data which may not yet be written and should u= se + * the memory callback API instead. + * + * Returns true on success and false on failure. + */ +QEMU_PLUGIN_API +bool qemu_plugin_read_memory_vaddr(uint64_t addr, + GByteArray *data, size_t len); + /** * qemu_plugin_read_register() - read register for current vCPU * diff --git a/plugins/api.c b/plugins/api.c index 2ff13d09de..cb7d818918 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -527,6 +527,26 @@ GArray *qemu_plugin_get_registers(void) return create_register_handles(regs); } =20 +bool qemu_plugin_read_memory_vaddr(vaddr addr, GByteArray *data, size_t le= n) +{ + g_assert(current_cpu); + + if (len =3D=3D 0) { + return false; + } + + g_byte_array_set_size(data, len); + + int result =3D cpu_memory_rw_debug(current_cpu, addr, data->data, + data->len, 0); + + if (result < 0) { + return false; + } + + return true; +} + int qemu_plugin_read_register(struct qemu_plugin_register *reg, GByteArray= *buf) { g_assert(current_cpu); diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols index ca773d8d9f..3ad479a924 100644 --- a/plugins/qemu-plugins.symbols +++ b/plugins/qemu-plugins.symbols @@ -20,6 +20,7 @@ qemu_plugin_num_vcpus; qemu_plugin_outs; qemu_plugin_path_to_binary; + qemu_plugin_read_memory_vaddr; qemu_plugin_read_register; qemu_plugin_register_atexit_cb; qemu_plugin_register_flush_cb; --=20 2.46.0