From: Gleb Natapov <[email protected]>

The Vista boot loaded expects the bios to report a correct count of the
bootable disks; and extboot disks are bootable.

This fixes Vista boot from virtio-blk issue.

Signed-off-by: Gleb Natapov <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
Signed-off-by: Anthony Liguori <[email protected]>

diff --git a/kvm/extboot/extboot.S b/kvm/extboot/extboot.S
index e3d1adf..1e60f68 100644
--- a/kvm/extboot/extboot.S
+++ b/kvm/extboot/extboot.S
@@ -32,6 +32,9 @@ _start:
        xor %ax, %ax
        mov %ax, %ds
 
+       /* there is one more bootable HD */
+       incb 0x0475
+
        /* save old int 19 */
        mov (0x19*4), %eax
        mov %eax, %cs:old_int19
--
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