5-level paging: enable 5-level paging in hardware

[quanxian]

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

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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 the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[quanxian (quanxian-wang)]

2f13eb7c580fcbe3d73ebbe6fb1841381cad0a05 59103caa6839592788e7ad58b35863aac034631a 5e3b4a15dd8da6bded2092694c8db3b505cbf711 f1ac10c24efbbcba0f8dae37ee90d45847f5c5af
v4.16