hw/display/ramfb: initialize fw-config space with xres/ yres

If xres / yres were specified in QEMU command line, write them as an initial
resolution to the fw-config space on guest reset, which a later BIOS / OVMF
patch can take advantage of.

Signed-off-by: HOU Qiming <hqm03ster@gmail.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Message-id: 20190513115731.17588-4-marcel.apfelbaum@gmail.com
[fixed malformed patch]
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/display/ramfb-standalone.c

@@ -1,6 +1,7 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "hw/loader.h"
+#include "hw/isa/isa.h"
 #include "hw/display/ramfb.h"
 #include "ui/console.h"
 #include "sysemu/sysemu.h"
@@ -11,6 +12,8 @@ typedef struct RAMFBStandaloneState {
     SysBusDevice parent_obj;
     QemuConsole *con;
     RAMFBState *state;
+    uint32_t xres;
+    uint32_t yres;
 } RAMFBStandaloneState;
 
 static void display_update_wrapper(void *dev)
@@ -33,15 +36,22 @@ static void ramfb_realizefn(DeviceState *dev, Error **errp)
     RAMFBStandaloneState *ramfb = RAMFB(dev);
 
     ramfb->con = graphic_console_init(dev, 0, &wrapper_ops, dev);
-    ramfb->state = ramfb_setup(errp);
+    ramfb->state = ramfb_setup(dev, errp);
 }
 
+static Property ramfb_properties[] = {
+    DEFINE_PROP_UINT32("xres", RAMFBStandaloneState, xres, 0),
+    DEFINE_PROP_UINT32("yres", RAMFBStandaloneState, yres, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void ramfb_class_initfn(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
     dc->realize = ramfb_realizefn;
+    dc->props = ramfb_properties;
     dc->desc = "ram framebuffer standalone device";
     dc->user_creatable = true;
 }

hw/display/ramfb.c

@@ -12,6 +12,7 @@
  */
 #include "qemu/osdep.h"
 #include "qapi/error.h"
+#include "qemu/option.h"
 #include "hw/loader.h"
 #include "hw/display/ramfb.h"
 #include "ui/console.h"
@@ -29,6 +30,7 @@ struct QEMU_PACKED RAMFBCfg {
 struct RAMFBState {
     DisplaySurface *ds;
     uint32_t width, height;
+    uint32_t starting_width, starting_height;
     struct RAMFBCfg cfg;
     bool locked;
 };
@@ -114,9 +116,11 @@ static void ramfb_reset(void *opaque)
     RAMFBState *s = (RAMFBState *)opaque;
     s->locked = false;
     memset(&s->cfg, 0, sizeof(s->cfg));
+    s->cfg.width = s->starting_width;
+    s->cfg.height = s->starting_height;
 }
 
-RAMFBState *ramfb_setup(Error **errp)
+RAMFBState *ramfb_setup(DeviceState* dev, Error **errp)
 {
     FWCfgState *fw_cfg = fw_cfg_find();
     RAMFBState *s;
@@ -128,6 +132,16 @@ RAMFBState *ramfb_setup(Error **errp)
 
     s = g_new0(RAMFBState, 1);
 
+    const char *s_fb_width = qemu_opt_get(dev->opts, "xres");
+    const char *s_fb_height = qemu_opt_get(dev->opts, "yres");
+    if (s_fb_width) {
+        s->cfg.width = atoi(s_fb_width);
+        s->starting_width = s->cfg.width;
+    }
+    if (s_fb_height) {
+        s->cfg.height = atoi(s_fb_height);
+        s->starting_height = s->cfg.height;
+    }
     s->locked = false;
 
     rom_add_vga("vgabios-ramfb.bin");

hw/vfio/display.c

@@ -352,7 +352,7 @@ static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
                                           &vfio_display_dmabuf_ops,
                                           vdev);
     if (vdev->enable_ramfb) {
-        vdev->dpy->ramfb = ramfb_setup(errp);
+        vdev->dpy->ramfb = ramfb_setup(DEVICE(vdev), errp);
     }
     vfio_display_edid_init(vdev);
     return 0;
@@ -478,7 +478,7 @@ static int vfio_display_region_init(VFIOPCIDevice *vdev, Error **errp)
                                           &vfio_display_region_ops,
                                           vdev);
     if (vdev->enable_ramfb) {
-        vdev->dpy->ramfb = ramfb_setup(errp);
+        vdev->dpy->ramfb = ramfb_setup(DEVICE(vdev), errp);
     }
     return 0;
 }

include/hw/display/ramfb.h

@@ -4,7 +4,7 @@
 /* ramfb.c */
 typedef struct RAMFBState RAMFBState;
 void ramfb_display_update(QemuConsole *con, RAMFBState *s);
-RAMFBState *ramfb_setup(Error **errp);
+RAMFBState *ramfb_setup(DeviceState *dev, Error **errp);
 
 /* ramfb-standalone.c */
 #define TYPE_RAMFB_DEVICE "ramfb"

stubs/ramfb.c

@@ -6,7 +6,7 @@ void ramfb_display_update(QemuConsole *con, RAMFBState *s)
 {
 }
 
-RAMFBState *ramfb_setup(Error **errp)
+RAMFBState *ramfb_setup(DeviceState* dev, Error **errp)
 {
     error_setg(errp, "ramfb support not available");
     return NULL;