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 1954466
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.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1954466
Title:
KVM Protection Keys for Supervisor Pages (PKS)
Status in linux package in Ubuntu:
Incomplete
Bug description:
SKX introduced the Protection Key for User Pages (PKU) feature
enabling fast, thread-specific manipulation of permission restrictions
on user pages. SPR introduced Protection Key for Supervisor
Pages(PKS), a new feature that extends the Protection Key architecture
to support thread-specific permission restrictions on supervisor
pages. This important feature enables enhanced access control on
memory, and brings more valid usage model.
Generally PKS enables protections on 'domains' of supervisor pages to
limit supervisor mode access to pages beyond the normal paging
protections(U/S, R/W, P). PKS works in a similar fashion to user space
pkeys, PKU. As with PKU, supervisor pkeys are checked in addition to
normal paging protections and Access or Writes can be disabled via a
MSR update without TLB flushes when permissions change.
PKS virtualization enabling should base on existing PKU code. Major
works:
CPUID exposure
New CR4 bit exposure
New VMCS fields enabling
IA32_PKRS saving/restoring
#GP handling
Target Linux 5.19
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