[Kernel-packages] [Bug 1736145] [NEW] Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition table

2017-12-04 Thread bugproxy 
Public bug reported:

== Comment: #0 - Breno Leitao  - 2017-12-04 05:50:27 ==
kexec can leave MMU registers set, PIDR in particular, when booting the
new kernel. The boot sequence does not zero PIDR ever, and it only gets
changed as CPUs first switch to userspace processes. This can leave a
window where speculative accesses from a CPU to quadrant 0 can pick up
translations in the partition table that may be set up for processes
running on other CPUs. These cached translations will not be involved in
the invalidation protocol, so we can end with stable TLB and PWC.


We need to have this patch included in Ubuntu kernel.
https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-December/166424.html

We do not have commit id, but once we have, I will post here. There is
no need to include the patch prior to upstream acceptance.

== Comment: #2 - VIPIN K. PARASHAR  - 2017-12-04 06:57:52 
==
(In reply to comment #0)
> 
> We need to have this patch included in Ubuntu kernel.
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-December/166424.html
> 
> We do not have commit id, but once we have, I will post here. There is no
> need to include the patch prior to upstream acceptance.
>

.. Patch subject reads as follows:

[PATCH] powerpc/64s: ISAv3 initialize MMU registers before setting
partition table

** Affects: linux (Ubuntu)
 Importance: Undecided
 Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
 Status: New


** Tags: architecture-ppc64le bugnameltc-162133 severity-high 
targetmilestone-inin16043

** Tags added: architecture-ppc64le bugnameltc-162133 severity-high
targetmilestone-inin16043

** Changed in: ubuntu
 Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage 
(ubuntu-power-triage)

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1736145

Title:
  Ubuntu16.04.03: ISAv3 initialize MMU registers before setting
  partition table

Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Breno Leitao  - 2017-12-04 05:50:27 ==
  kexec can leave MMU registers set, PIDR in particular, when booting the
  new kernel. The boot sequence does not zero PIDR ever, and it only gets
  changed as CPUs first switch to userspace processes. This can leave a
  window where speculative accesses from a CPU to quadrant 0 can pick up
  translations in the partition table that may be set up for processes
  running on other CPUs. These cached translations will not be involved in
  the invalidation protocol, so we can end with stable TLB and PWC.

  
  We need to have this patch included in Ubuntu kernel.
  https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-December/166424.html

  We do not have commit id, but once we have, I will post here. There is
  no need to include the patch prior to upstream acceptance.

  == Comment: #2 - VIPIN K. PARASHAR  - 2017-12-04 
06:57:52 ==
  (In reply to comment #0)
  > 
  > We need to have this patch included in Ubuntu kernel.
  > https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-December/166424.html
  > 
  > We do not have commit id, but once we have, I will post here. There is no
  > need to include the patch prior to upstream acceptance.
  >

  .. Patch subject reads as follows:

  [PATCH] powerpc/64s: ISAv3 initialize MMU registers before setting
  partition table

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[Kernel-packages] [Bug 1736145] [NEW] Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition table

2017-12-04 Thread Launchpad Bug Tracker 
You have been subscribed to a public bug:

== Comment: #0 - Breno Leitao  - 2017-12-04 05:50:27 ==
kexec can leave MMU registers set, PIDR in particular, when booting the
new kernel. The boot sequence does not zero PIDR ever, and it only gets
changed as CPUs first switch to userspace processes. This can leave a
window where speculative accesses from a CPU to quadrant 0 can pick up
translations in the partition table that may be set up for processes
running on other CPUs. These cached translations will not be involved in
the invalidation protocol, so we can end with stable TLB and PWC.


We need to have this patch included in Ubuntu kernel.
https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-December/166424.html

We do not have commit id, but once we have, I will post here. There is
no need to include the patch prior to upstream acceptance.

== Comment: #2 - VIPIN K. PARASHAR  - 2017-12-04 06:57:52 
==
(In reply to comment #0)
> 
> We need to have this patch included in Ubuntu kernel.
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-December/166424.html
> 
> We do not have commit id, but once we have, I will post here. There is no
> need to include the patch prior to upstream acceptance.
>

.. Patch subject reads as follows:

[PATCH] powerpc/64s: ISAv3 initialize MMU registers before setting
partition table

** Affects: linux (Ubuntu)
 Importance: Undecided
 Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
 Status: New


** Tags: architecture-ppc64le bugnameltc-162133 severity-high 
targetmilestone-inin16043
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Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition table
https://bugs.launchpad.net/bugs/1736145
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