** Also affects: ubuntu-power-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-power-systems
       Status: New => Triaged

** Tags added: triage-g

** Changed in: ubuntu-power-systems
   Importance: Undecided => High

** Changed in: ubuntu-power-systems
     Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

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https://bugs.launchpad.net/bugs/1771844

Title:
  powerpc/livepatch: Implement reliable stack tracing for the
  consistency model

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 ==
  Livepatch has a consistency model which is a hybrid of kGraft and kpatch:  it 
uses kGraft's per-task consistency and syscall barrier switching combined with 
kpatch's stack trace switching. The current approach is stack checking of 
sleeping tasks.  If no affected functions are on the stack of a given task, the 
task is patched.  In most cases this will patch most or all of the tasks on the 
first try.  Otherwise, it'll keep trying periodically.  This patch implements 
the reliable stack tracing for consistency model a.k.a 
HAVE_RELIABLE_STACKTRACE. 

  This will help in switching livepatching implementation to basic per-
  task consistency model. It is the foundation, which will help us
  enable security patches changing function or data semantics. This is
  the biggest remaining piece needed on ppc64le to make livepatch more
  generally useful.

  
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac

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