[PATCH v3 4/8] Add memory virtual address write API

[Rowan Hart <rowanbhart@gmail.com>]

From: novafacing <rowanbhart@gmail.com>

Signed-off-by: novafacing <rowanbhart@gmail.com>
Signed-off-by: Rowan Hart <rowanbhart@gmail.com>
---
 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