qxl: fix vga port initialization.

Commit 0a039dc70096b768d3810afa50ba1d214768aaf4 broke vga modes for
qxl-vga by loosing vga_ioport_read windup.  qxl needs to hook into
vga port writes only and used to realize that by letting vga_init() do
the work for both reads and writes, then overwrite the write function.
That little detail was missed while doing the conversion ...

This patch fixes it.  It also switch qxl vga ioport registration to
portio lists while being at it.

Cc: Hans de Goede <hdegoede@redhat.com>
Acked-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/qxl.c

@@ -896,6 +896,20 @@ static void qxl_vga_ioport_write(void *opaque, uint32_t addr, uint32_t val)
     vga_ioport_write(opaque, addr, val);
 }
 
+static const MemoryRegionPortio qxl_vga_portio_list[] = {
+    { 0x04,  2, 1, .read  = vga_ioport_read,
+                   .write = qxl_vga_ioport_write }, /* 3b4 */
+    { 0x0a,  1, 1, .read  = vga_ioport_read,
+                   .write = qxl_vga_ioport_write }, /* 3ba */
+    { 0x10, 16, 1, .read  = vga_ioport_read,
+                   .write = qxl_vga_ioport_write }, /* 3c0 */
+    { 0x24,  2, 1, .read  = vga_ioport_read,
+                   .write = qxl_vga_ioport_write }, /* 3d4 */
+    { 0x2a,  1, 1, .read  = vga_ioport_read,
+                   .write = qxl_vga_ioport_write }, /* 3da */
+    PORTIO_END_OF_LIST(),
+};
+
 static void qxl_add_memslot(PCIQXLDevice *d, uint32_t slot_id, uint64_t delta,
                             qxl_async_io async)
 {
@@ -1595,6 +1609,7 @@ static int qxl_init_primary(PCIDevice *dev)
     PCIQXLDevice *qxl = DO_UPCAST(PCIQXLDevice, pci, dev);
     VGACommonState *vga = &qxl->vga;
     ram_addr_t ram_size = msb_mask(qxl->vga.vram_size * 2 - 1);
+    PortioList *qxl_vga_port_list = g_new(PortioList, 1);
 
     qxl->id = 0;
 
@@ -1603,11 +1618,8 @@ static int qxl_init_primary(PCIDevice *dev)
     }
     vga_common_init(vga, ram_size);
     vga_init(vga, pci_address_space(dev), pci_address_space_io(dev), false);
-    register_ioport_write(0x3c0, 16, 1, qxl_vga_ioport_write, vga);
-    register_ioport_write(0x3b4,  2, 1, qxl_vga_ioport_write, vga);
-    register_ioport_write(0x3d4,  2, 1, qxl_vga_ioport_write, vga);
-    register_ioport_write(0x3ba,  1, 1, qxl_vga_ioport_write, vga);
-    register_ioport_write(0x3da,  1, 1, qxl_vga_ioport_write, vga);
+    portio_list_init(qxl_vga_port_list, qxl_vga_portio_list, vga, "vga");
+    portio_list_add(qxl_vga_port_list, pci_address_space_io(dev), 0x3b0);
 
     vga->ds = graphic_console_init(qxl_hw_update, qxl_hw_invalidate,
                                    qxl_hw_screen_dump, qxl_hw_text_update, qxl);