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Thu, 19 Jun 2025 09:15:51 -0700 (PDT) From: Rowan Hart To: qemu-devel@nongnu.org Cc: Pierrick Bouvier , Marcel Apfelbaum , Zhao Liu , Richard Henderson , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Alexandre Iooss , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Yanan Wang , Eduardo Habkost , Mahmoud Mandour , Paolo Bonzini , novafacing Subject: [PATCH v13 2/7] plugins: Add register write API Date: Thu, 19 Jun 2025 09:15:42 -0700 Message-ID: <20250619161547.1401448-3-rowanbhart@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250619161547.1401448-1-rowanbhart@gmail.com> References: <20250619161547.1401448-1-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::432; envelope-from=rowanbhart@gmail.com; helo=mail-pf1-x432.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 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: 1750349827905116600 Content-Type: text/plain; charset="utf-8" From: novafacing This patch adds a function to the plugins API to allow plugins to write register contents. It also moves the qemu_plugin_read_register function so all the register-related functions are grouped together in the file. Reviewed-by: Pierrick Bouvier Signed-off-by: Rowan Hart --- include/qemu/qemu-plugin.h | 54 ++++++++++++++++++++++++++------------ plugins/api.c | 26 +++++++++++++----- 2 files changed, 56 insertions(+), 24 deletions(-) diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index 3a850aa216..cfe1692ecb 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -871,7 +871,8 @@ struct qemu_plugin_register; /** * typedef qemu_plugin_reg_descriptor - register descriptions * - * @handle: opaque handle for retrieving value with qemu_plugin_read_regis= ter + * @handle: opaque handle for retrieving value with qemu_plugin_read_regis= ter or + * writing value with qemu_plugin_write_register * @name: register name * @feature: optional feature descriptor, can be NULL */ @@ -893,6 +894,41 @@ typedef struct { QEMU_PLUGIN_API GArray *qemu_plugin_get_registers(void); =20 +/** + * qemu_plugin_read_register() - read register for current vCPU + * + * @handle: a @qemu_plugin_reg_handle handle + * @buf: A GByteArray for the data owned by the plugin + * + * This function is only available in a context that register read access = is + * explicitly requested via the QEMU_PLUGIN_CB_R_REGS flag. + * + * Returns the size of the read register. The content of @buf is in target= byte + * order. On failure returns -1. + */ +QEMU_PLUGIN_API +int qemu_plugin_read_register(struct qemu_plugin_register *handle, + GByteArray *buf); + +/** + * qemu_plugin_write_register() - write register for current vCPU + * + * @handle: a @qemu_plugin_reg_handle handle + * @buf: A GByteArray for the data owned by the plugin + * + * This function is only available in a context that register write access= is + * explicitly requested via the QEMU_PLUGIN_CB_RW_REGS flag. + * + * The size of @buf must be at least the size of the requested register. + * Attempting to write a register with @buf smaller than the register size + * will result in a crash or other undesired behavior. + * + * Returns the number of bytes written. On failure returns 0. + */ +QEMU_PLUGIN_API +int qemu_plugin_write_register(struct qemu_plugin_register *handle, + GByteArray *buf); + /** * qemu_plugin_read_memory_vaddr() - read from memory using a virtual addr= ess * @@ -915,22 +951,6 @@ QEMU_PLUGIN_API bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByteArray *data, size_t len); =20 -/** - * qemu_plugin_read_register() - read register for current vCPU - * - * @handle: a @qemu_plugin_reg_handle handle - * @buf: A GByteArray for the data owned by the plugin - * - * This function is only available in a context that register read access = is - * explicitly requested via the QEMU_PLUGIN_CB_R_REGS flag. - * - * Returns the size of the read register. The content of @buf is in target= byte - * order. On failure returns -1. - */ -QEMU_PLUGIN_API -int qemu_plugin_read_register(struct qemu_plugin_register *handle, - GByteArray *buf); - /** * qemu_plugin_scoreboard_new() - alloc a new scoreboard * diff --git a/plugins/api.c b/plugins/api.c index 3c9d4832e9..6514f2c76a 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -433,6 +433,25 @@ GArray *qemu_plugin_get_registers(void) return create_register_handles(regs); } =20 +int qemu_plugin_read_register(struct qemu_plugin_register *reg, GByteArray= *buf) +{ + g_assert(current_cpu); + + return gdb_read_register(current_cpu, buf, GPOINTER_TO_INT(reg) - 1); +} + +int qemu_plugin_write_register(struct qemu_plugin_register *reg, + GByteArray *buf) +{ + g_assert(current_cpu); + + if (buf->len =3D=3D 0 || qemu_plugin_get_cb_flags() !=3D QEMU_PLUGIN_C= B_RW_REGS) { + return -1; + } + + return gdb_write_register(current_cpu, buf->data, GPOINTER_TO_INT(reg)= - 1); +} + bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByteArray *data, size_t= len) { g_assert(current_cpu); @@ -453,13 +472,6 @@ bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByt= eArray *data, size_t len) return true; } =20 -int qemu_plugin_read_register(struct qemu_plugin_register *reg, GByteArray= *buf) -{ - g_assert(current_cpu); - - return gdb_read_register(current_cpu, buf, GPOINTER_TO_INT(reg) - 1); -} - struct qemu_plugin_scoreboard *qemu_plugin_scoreboard_new(size_t element_s= ize) { return plugin_scoreboard_new(element_size); --=20 2.49.0