PPC: Round VGA BIOS size to page boundary

When giving KVM a slot of a size not on page boundary, it chokes. So let's
just round up the VGA BIOS size so nobody complains anymore and we don't need
to implement sub-page slots.

Required for booting a PPC guest in KVM.
Signed-off-by: NAlexander Graf <agraf@suse.de>

hw/ppc_newworld.c

@@ -179,6 +179,10 @@ static void ppc_core99_init (ram_addr_t ram_size,
         vga_bios_ptr[3] = 'V';
         cpu_to_be32w((uint32_t *)(vga_bios_ptr + 4), vga_bios_size);
         vga_bios_size += 8;
+
+        /* Round to page boundary */
+        vga_bios_size = (vga_bios_size + TARGET_PAGE_SIZE - 1) &
+            TARGET_PAGE_MASK;
     }
 
     if (linux_boot) {

hw/ppc_oldworld.c

@@ -212,6 +212,10 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
         vga_bios_ptr[3] = 'V';
         cpu_to_be32w((uint32_t *)(vga_bios_ptr + 4), vga_bios_size);
         vga_bios_size += 8;
+
+        /* Round to page boundary */
+        vga_bios_size = (vga_bios_size + TARGET_PAGE_SIZE - 1) &
+            TARGET_PAGE_MASK;
     }
 
     if (linux_boot) {