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Wed, 21 May 2025 02:43:37 -0700 (PDT) Received: from shemhazi.lan ([50.46.174.34]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-742a9829b87sm9255668b3a.114.2025.05.21.02.43.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 May 2025 02:43:36 -0700 (PDT) From: Rowan Hart To: qemu-devel@nongnu.org Cc: Pierrick Bouvier , Alexandre Iooss , Richard Henderson , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Eduardo Habkost , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Mahmoud Mandour , Paolo Bonzini , novafacing Subject: [PATCH v3 4/8] Add memory virtual address write API Date: Wed, 21 May 2025 02:43:28 -0700 Message-ID: <20250521094333.4075796-5-rowanbhart@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250521094333.4075796-1-rowanbhart@gmail.com> References: <20250521094333.4075796-1-rowanbhart@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::434; envelope-from=rowanbhart@gmail.com; helo=mail-pf1-x434.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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: novafacing Signed-off-by: novafacing Signed-off-by: Rowan Hart --- include/qemu/qemu-plugin.h | 21 +++++++++++++++++++++ plugins/api.c | 18 ++++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index 1380f7d441..eff8430b4a 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -993,6 +993,27 @@ QEMU_PLUGIN_API bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByteArray *data, size_t len); +/** + * qemu_plugin_write_memory_vaddr() - write to memory using a virtual address + * + * @addr: A virtual address to write to + * @data: A byte array containing the data to write + * + * The contents of @data will be written to memory starting at the virtual + * address @addr. + * + * This function does not guarantee consistency of writes, nor does it ensure + * that pending writes are flushed either before or after the write takes place, + * so callers should take care to only call this function in vCPU context (i.e. + * in callbacks) and avoid depending on the existence of data written using this + * function which may be overwritten afterward. + * + * Returns true on success and false on failure. + */ +QEMU_PLUGIN_API +bool qemu_plugin_write_memory_vaddr(uint64_t addr, + GByteArray *data); + /** * qemu_plugin_scoreboard_new() - alloc a new scoreboard * diff --git a/plugins/api.c b/plugins/api.c index d1cc6ff86e..19c10bb39e 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -551,6 +551,24 @@ bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByteArray *data, size_t len) return true; } +bool qemu_plugin_write_memory_vaddr(uint64_t addr, GByteArray *data) +{ + g_assert(current_cpu); + + if (data->len == 0) { + return false; + } + + int result = cpu_memory_rw_debug(current_cpu, addr, data->data, + data->len, true); + + if (result < 0) { + return false; + } + + return true; +} + struct qemu_plugin_scoreboard *qemu_plugin_scoreboard_new(size_t element_size) { return plugin_scoreboard_new(element_size); -- 2.49.0