This bug was fixed in the package kexec-tools - 1:2.0.14-1ubuntu3
---------------
kexec-tools (1:2.0.14-1ubuntu3) zesty; urgency=medium
* kexec: Increase the upper limit for RAM segments (LP: #1663400)
-- Manoj Iyer <manoj.i...@canonical.com> Tue, 14 Feb 2017 14:00:14
+0000
** Changed in: kexec-tools (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1663400
Title:
kexec: arm64: Increase the upper limit for RAM segments
Status in kexec-tools package in Ubuntu:
Fix Released
Status in kexec-tools source package in Xenial:
In Progress
Status in kexec-tools source package in Yakkety:
In Progress
Status in kexec-tools package in Debian:
New
Bug description:
[Impact]
Currently kexec is unable to see all the "System RAM" recorded in /proc/iomem.
On a newer UEFI based Qualcomm target the number of system ram regions
retrieved from /proc/iomem are ~40. Currently KEXEC_SEGMENT_MAX is
set to 16, which represents the kexec segments passed to kexec_load
syscall, like kernel image, initrd image etc. The patch increases the
value to 64. This enables kexec to see all the "System RAM" as
recorded in /proc/iomem.
[Test Case]
== System RAM reported by /proc/iomem ==
ubuntu@ubuntu:~$ sudo cat /proc/iomem | grep "System RAM"
00200000-0020ffff : System RAM
00820000-0307ffff : System RAM
03080000-0308ffff : System RAM
03090000-031fffff : System RAM
03200000-033fffff : System RAM
03410000-0589ffff : System RAM
058a0000-058affff : System RAM
058b0000-058bffff : System RAM
058c0000-0597ffff : System RAM
05980000-05987fff : System RAM
05988000-0598bfff : System RAM
0598c000-05a0ffff : System RAM
05a10000-05aaffff : System RAM
05ab0000-05ca0fff : System RAM
05ca1000-08caffff : System RAM
08cb0000-08cfffff : System RAM
08d00000-08edffff : System RAM
08ee0000-08ee0fff : System RAM
08ee1000-08ee3fff : System RAM
08ee4000-08eeffff : System RAM
08ef0000-092affff : System RAM
092b0000-092dffff : System RAM
092e0000-09422fff : System RAM
09423000-0949ffff : System RAM
094a0000-0957ffff : System RAM
09580000-0958cfff : System RAM
0958d000-098cffff : System RAM
098d0000-098d0fff : System RAM
098d1000-098dbfff : System RAM
098dc000-0e8bffff : System RAM
0e8c0000-0e8effff : System RAM
0e8f0000-0fffffff : System RAM
10800000-17feffff : System RAM
1c020000-1c7fffff : System RAM
1c800000-1c80ffff : System RAM
1c810000-7efbffff : System RAM
7efc0000-7efdffff : System RAM
7efe0000-7efeffff : System RAM
7eff0000-7effffff : System RAM
7f000000-17ffffffff : System RAM
ubuntu@ubuntu:~$
== BEFORE PATCH: System RAM reported by kexec ==
ubuntu@ubuntu:~$ sudo kexec -d -l /boot/vmlinuz-4.7.0-2-generic --reuse-cmd
--initrd=/boot/initrd.img-4.7.0-2-generic | grep "System RAM"
get_memory_ranges_iomem_cb: 0000000000200000 - 000000000020ffff : System RAM
get_memory_ranges_iomem_cb: 0000000000820000 - 000000000307ffff : System RAM
get_memory_ranges_iomem_cb: 0000000003080000 - 000000000308ffff : System RAM
get_memory_ranges_iomem_cb: 0000000003090000 - 00000000031fffff : System RAM
get_memory_ranges_iomem_cb: 0000000003200000 - 00000000033fffff : System RAM
get_memory_ranges_iomem_cb: 0000000003410000 - 000000000589ffff : System RAM
get_memory_ranges_iomem_cb: 00000000058a0000 - 00000000058affff : System RAM
get_memory_ranges_iomem_cb: 00000000058b0000 - 00000000058bffff : System RAM
get_memory_ranges_iomem_cb: 00000000058c0000 - 000000000597ffff : System RAM
get_memory_ranges_iomem_cb: 0000000005980000 - 0000000005987fff : System RAM
get_memory_ranges_iomem_cb: 0000000005988000 - 000000000598bfff : System RAM
get_memory_ranges_iomem_cb: 000000000598c000 - 0000000005a0ffff : System RAM
get_memory_ranges_iomem_cb: 0000000005a10000 - 0000000005aaffff : System RAM
get_memory_ranges_iomem_cb: 0000000005ab0000 - 0000000005ca0fff : System RAM
get_memory_ranges_iomem_cb: 0000000005ca1000 - 0000000008caffff : System RAM
get_memory_ranges_iomem_cb: 0000000008cb0000 - 0000000008cfffff : System RAM
==AFTER PATCH: System RAM reported by kexec ==
ubuntu@ubuntu:~$ sudo kexec -d -l /boot/vmlinuz-4.7.0-2-generic --reuse-cmd
--initrd=/boot/initrd.img-4.7.0-2-generic | grep "System RAM"
get_memory_ranges_iomem_cb: 0000000000200000 - 000000000020ffff : System RAM
get_memory_ranges_iomem_cb: 0000000000820000 - 000000000307ffff : System RAM
get_memory_ranges_iomem_cb: 0000000003080000 - 000000000308ffff : System RAM
get_memory_ranges_iomem_cb: 0000000003090000 - 00000000031fffff : System RAM
get_memory_ranges_iomem_cb: 0000000003200000 - 00000000033fffff : System RAM
get_memory_ranges_iomem_cb: 0000000003410000 - 000000000589ffff : System RAM
get_memory_ranges_iomem_cb: 00000000058a0000 - 00000000058affff : System RAM
get_memory_ranges_iomem_cb: 00000000058b0000 - 00000000058bffff : System RAM
get_memory_ranges_iomem_cb: 00000000058c0000 - 000000000597ffff : System RAM
get_memory_ranges_iomem_cb: 0000000005980000 - 0000000005987fff : System RAM
get_memory_ranges_iomem_cb: 0000000005988000 - 000000000598bfff : System RAM
get_memory_ranges_iomem_cb: 000000000598c000 - 0000000005a0ffff : System RAM
get_memory_ranges_iomem_cb: 0000000005a10000 - 0000000005aaffff : System RAM
get_memory_ranges_iomem_cb: 0000000005ab0000 - 0000000005ca0fff : System RAM
get_memory_ranges_iomem_cb: 0000000005ca1000 - 0000000008caffff : System RAM
get_memory_ranges_iomem_cb: 0000000008cb0000 - 0000000008cfffff : System RAM
get_memory_ranges_iomem_cb: 0000000008d00000 - 0000000008edffff : System RAM
get_memory_ranges_iomem_cb: 0000000008ee0000 - 0000000008ee0fff : System RAM
get_memory_ranges_iomem_cb: 0000000008ee1000 - 0000000008ee3fff : System RAM
get_memory_ranges_iomem_cb: 0000000008ee4000 - 0000000008eeffff : System RAM
get_memory_ranges_iomem_cb: 0000000008ef0000 - 00000000092affff : System RAM
get_memory_ranges_iomem_cb: 00000000092b0000 - 00000000092dffff : System RAM
get_memory_ranges_iomem_cb: 00000000092e0000 - 0000000009422fff : System RAM
get_memory_ranges_iomem_cb: 0000000009423000 - 000000000949ffff : System RAM
get_memory_ranges_iomem_cb: 00000000094a0000 - 000000000957ffff : System RAM
get_memory_ranges_iomem_cb: 0000000009580000 - 000000000958cfff : System RAM
get_memory_ranges_iomem_cb: 000000000958d000 - 00000000098cffff : System RAM
get_memory_ranges_iomem_cb: 00000000098d0000 - 00000000098d0fff : System RAM
get_memory_ranges_iomem_cb: 00000000098d1000 - 00000000098dbfff : System RAM
get_memory_ranges_iomem_cb: 00000000098dc000 - 000000000e8bffff : System RAM
get_memory_ranges_iomem_cb: 000000000e8c0000 - 000000000e8effff : System RAM
get_memory_ranges_iomem_cb: 000000000e8f0000 - 000000000fffffff : System RAM
get_memory_ranges_iomem_cb: 0000000010800000 - 0000000017feffff : System RAM
get_memory_ranges_iomem_cb: 000000001c020000 - 000000001c7fffff : System RAM
get_memory_ranges_iomem_cb: 000000001c800000 - 000000001c80ffff : System RAM
get_memory_ranges_iomem_cb: 000000001c810000 - 000000007efbffff : System RAM
get_memory_ranges_iomem_cb: 000000007efc0000 - 000000007efdffff : System RAM
get_memory_ranges_iomem_cb: 000000007efe0000 - 000000007efeffff : System RAM
get_memory_ranges_iomem_cb: 000000007eff0000 - 000000007effffff : System RAM
get_memory_ranges_iomem_cb: 000000007f000000 - 00000017ffffffff : System RAM
[Regression Potential]
Since patches are confined to arm[64] there is a low overall risk of
regression.
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