** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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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:
New
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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