From: Glauber Costa <glommer@redhat.com>
Subject: [PATCH] align vga rom to 4k boundary.

Instead of aligning to 2k boundary, as required by the bios,
align to 4k boundary, as required by kvm memory functions. Without
this patch, starting kvm with -vga std option fails with:

create_userspace_phys_mem: Invalid argument
kvm_cpu_register_physical_memory: failed

as described by: https://bugzilla.redhat.com/494376

It does not fail with cirrus vga, because it is naturally aligned.
This problem does not seem to affect upstream qemu.

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 qemu/hw/pc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/qemu/hw/pc.c b/qemu/hw/pc.c
index cc84772..680d4a2 100644
--- a/qemu/hw/pc.c
+++ b/qemu/hw/pc.c
@@ -919,7 +919,7 @@ vga_bios_error:
             exit(1);
         }
 	/* Round up vga bios size to the next 2k boundary */
-	vga_bios_size = (vga_bios_size + 2047) & ~2047;
+	vga_bios_size = (vga_bios_size + 4095) & ~4095;
 	option_rom_start = 0xc0000 + vga_bios_size;
 
         /* setup basic memory access */
-- 
1.5.6.6