diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 6312c6e..6e9e83d 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -1955,9 +1955,11 @@ static void cirrus_mem_writeb_mode4and5_16bpp(CirrusVGAState * s,
  *
  ***************************************/
 
-static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
+static uint64_t cirrus_vga_mem_read(MemoryRegion *mr,
+                                    target_phys_addr_t addr,
+                                    uint32_t size)
 {
-    CirrusVGAState *s = opaque;
+    CirrusVGAState *s = container_of(mr, CirrusVGAState, low_mem);
     unsigned bank_index;
     unsigned bank_offset;
     uint32_t val;
@@ -1966,8 +1968,6 @@ static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
 	return vga_mem_readb(s, addr);
     }
 
-    addr &= 0x1ffff;
-
     if (addr < 0x10000) {
 	/* XXX handle bitblt */
 	/* video memory */
@@ -1999,30 +1999,12 @@ static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
     return val;
 }
 
-static uint32_t cirrus_vga_mem_readw(void *opaque, target_phys_addr_t addr)
+static void cirrus_vga_mem_write(MemoryRegion *mr,
+                                 target_phys_addr_t addr,
+                                 uint64_t mem_value,
+                                 uint32_t size)
 {
-    uint32_t v;
-
-    v = cirrus_vga_mem_readb(opaque, addr);
-    v |= cirrus_vga_mem_readb(opaque, addr + 1) << 8;
-    return v;
-}
-
-static uint32_t cirrus_vga_mem_readl(void *opaque, target_phys_addr_t addr)
-{
-    uint32_t v;
-
-    v = cirrus_vga_mem_readb(opaque, addr);
-    v |= cirrus_vga_mem_readb(opaque, addr + 1) << 8;
-    v |= cirrus_vga_mem_readb(opaque, addr + 2) << 16;
-    v |= cirrus_vga_mem_readb(opaque, addr + 3) << 24;
-    return v;
-}
-
-static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
-                                  uint32_t mem_value)
-{
-    CirrusVGAState *s = opaque;
+    CirrusVGAState *s = container_of(mr, CirrusVGAState, low_mem);
     unsigned bank_index;
     unsigned bank_offset;
     unsigned mode;
@@ -2032,8 +2014,6 @@ static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
         return;
     }
 
-    addr &= 0x1ffff;
-
     if (addr < 0x10000) {
 	if (s->cirrus_srcptr != s->cirrus_srcptr_end) {
 	    /* bitblt */
@@ -2083,51 +2063,14 @@ static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
     }
 }
 
-static void cirrus_vga_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
-{
-    cirrus_vga_mem_writeb(opaque, addr, val & 0xff);
-    cirrus_vga_mem_writeb(opaque, addr + 1, (val >> 8) & 0xff);
-}
-
-static void cirrus_vga_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
-{
-    cirrus_vga_mem_writeb(opaque, addr, val & 0xff);
-    cirrus_vga_mem_writeb(opaque, addr + 1, (val >> 8) & 0xff);
-    cirrus_vga_mem_writeb(opaque, addr + 2, (val >> 16) & 0xff);
-    cirrus_vga_mem_writeb(opaque, addr + 3, (val >> 24) & 0xff);
-}
-
-static uint64_t cirrus_vga_mem_read(MemoryRegion *mr,
-                                    target_phys_addr_t addr,
-                                    uint32_t size)
-{
-    CirrusVGAState *s = container_of(mr, CirrusVGAState, low_mem);
-
-    switch (size) {
-    case 1: return cirrus_vga_mem_readb(s, addr);
-    case 2: return cirrus_vga_mem_readw(s, addr);
-    case 4: return cirrus_vga_mem_readl(s, addr);
-    default: abort();
-    }
-}
-
-static void cirrus_vga_mem_write(MemoryRegion *mr, target_phys_addr_t addr,
-                                 uint64_t data, unsigned size)
-{
-    CirrusVGAState *s = container_of(mr, CirrusVGAState, low_mem);
-
-    switch (size) {
-    case 1: return cirrus_vga_mem_writeb(s, addr, data);
-    case 2: return cirrus_vga_mem_writew(s, addr, data);
-    case 4: return cirrus_vga_mem_writel(s, addr, data);
-    default: abort();
-    }
-};
-
 static MemoryRegionOps cirrus_vga_mem_ops = {
     .read = cirrus_vga_mem_read,
     .write = cirrus_vga_mem_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 1,
+    },
 };
 
 /***************************************
