This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1848977
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: focal
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https://bugs.launchpad.net/bugs/1848977
Title:
5-level paging: enable 5-level paging in hardware
Status in intel:
New
Status in linux package in Ubuntu:
Incomplete
Bug description:
Description:
Need add kernel configuration to enable this feature. Enable
CONFIG_X86_5LEVEL
Test process of 19.10
root@ubuntu:~/check_5level_page# cat /boot/config-5.4.0-rc2+ | grep
CONFIG_X86_5LEVEL
# CONFIG_X86_5LEVEL is not set
root@ubuntu:~/check_5level_page# cat /proc/cpuinfo | grep la57
root@ubuntu:~/check_5level_page#
The IOMMU hardware is also changing with 5-level paging. This item is to
track the work that needs to be done to update the IOMMU code for the new
5-level tables.
The IOMMU code is also substantially more abstracted than the plain
pagetable code, and it may be able to handle the extra level and
address space with few or no changes. It's possible this will simply
become a validation activity.
Target Release: 20.04
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