[Qemu-devel] [PATCH 05/14] console: add qemu_create_displaysurface_guestmem

[Gerd Hoffmann <kraxel@redhat.com>]

This patch adds a qemu_create_displaysurface_guestmem helper function.
Works simliar to qemu_create_displaysurface_from, but accepts a
guest address instead of a host pointer and it handles
cpu_physical_memory_{map,unmap} for you.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/ui/console.h |  4 ++++
 ui/console.c         | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/include/ui/console.h b/include/ui/console.h
index 68ac362..61901f7 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -189,6 +189,10 @@ DisplayState *init_displaystate(void);
 DisplaySurface *qemu_create_displaysurface_from(int width, int height,
                                                 pixman_format_code_t format,
                                                 int linesize, uint8_t *data);
+DisplaySurface *qemu_create_displaysurface_guestmem(int width, int height,
+                                                    pixman_format_code_t format,
+                                                    int linesize,
+                                                    uint64_t addr);
 PixelFormat qemu_different_endianness_pixelformat(int bpp);
 PixelFormat qemu_default_pixelformat(int bpp);
 
diff --git a/ui/console.c b/ui/console.c
index 968aaaf..654c0d3 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -28,6 +28,7 @@
 #include "qmp-commands.h"
 #include "sysemu/char.h"
 #include "trace.h"
+#include "exec/memory.h"
 
 #define DEFAULT_BACKSCROLL 512
 #define CONSOLE_CURSOR_PERIOD 500
@@ -1270,6 +1271,42 @@ DisplaySurface *qemu_create_displaysurface_from(int width, int height,
     return surface;
 }
 
+static void qemu_unmap_displaysurface_guestmem(pixman_image_t *image,
+                                               void *unused)
+{
+    void *data = pixman_image_get_data(image);
+    uint32_t size = pixman_image_get_stride(image) *
+        pixman_image_get_height(image);
+    cpu_physical_memory_unmap(data, size, 0, 0);
+}
+
+DisplaySurface *qemu_create_displaysurface_guestmem(int width, int height,
+                                                    pixman_format_code_t format,
+                                                    int linesize, uint64_t addr)
+{
+    DisplaySurface *surface;
+    hwaddr size;
+    void *data;
+
+    if (linesize == 0) {
+        linesize = width * PIXMAN_FORMAT_BPP(format) / 8;
+    }
+
+    size = linesize * height;
+    data = cpu_physical_memory_map(addr, &size, 0);
+    if (size != linesize * height) {
+        cpu_physical_memory_unmap(data, size, 0, 0);
+        return NULL;
+    }
+
+    surface = qemu_create_displaysurface_from
+        (width, height, format, linesize, data);
+    pixman_image_set_destroy_function
+        (surface->image, qemu_unmap_displaysurface_guestmem, NULL);
+
+    return surface;
+}
+
 static DisplaySurface *qemu_create_message_surface(int w, int h,
                                                    const char *msg)
 {
-- 
1.8.3.1