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[04/17] kvm: extboot: Update number of HDs reported by BIOS

Message ID 1242574999-20887-5-git-send-email-aliguori@us.ibm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Anthony Liguori May 17, 2009, 3:43 p.m. UTC 
From: Gleb Natapov <gleb@redhat.com>

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 <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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Patch

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