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From 0e7af58f29e49aba87f3c0d968b084c124fe5dbe Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Sun, 18 Dec 2016 19:27:20 +0000
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Subject: [PATCH] appliance: Disable EDD (edd=off) (RHBZ#1404287).
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EDD (https://en.wikipedia.org/wiki/Enhanced_Disk_Drive) is a BIOS INT 13h
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subcall for communicating the extended size of the boot disk over 8GB
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to the OS. Since libguestfs doesn't use a boot disk, and the
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appliance disk is limited to 4GB, and we use virtio-scsi, this is all
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useless.
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EDD is also broken currently on RHEL 7.3, see:
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https://bugzilla.redhat.com/show_bug.cgi?id=1404287
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Also the EDD probing takes significant extra time (about 80ms on my
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laptop), and using edd=off reduces this time although doesn't entirely
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eliminate it.
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(cherry picked from commit 764fd3fcc629ff91582ec8549ff80c240ba8393b)
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---
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src/launch.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/src/launch.c b/src/launch.c
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index 269eeca..0075ea7 100644
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--- a/src/launch.c
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+++ b/src/launch.c
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@@ -332,6 +332,7 @@ guestfs_int_appliance_command_line (guestfs_h *g, const char *appliance_dev,
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*/
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" efi-rtc=noprobe"
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#endif
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+ " edd=off" /* RHBZ#1404287 */
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" udevtimeout=6000"/* for slow systems (RHBZ#480319, RHBZ#1096579) */
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" udev.event-timeout=6000" /* for newer udevd */
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" no_timer_check" /* fix for RHBZ#502058 */
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--
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7af31e |
1.8.3.1
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