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

[Manoj Iyer]

Marking bionic fix-released since the patch identified here is already in master
371b80447ff3 powerpc/64s: Initialize ISAv3 MMU registers before setting 
partition table

** Changed in: linux (Ubuntu Bionic)
   Status: Fix Committed => Fix Released

** Changed in: ubuntu-power-systems
   Status: Fix Committed => Fix Released

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

Status in The Ubuntu-power-systems project:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  == SRU Justification ==
  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.

  This commit was included in mailine as of v4.15-rc5 and fixes commit
  7e381c0ff618.

  == Fix ==
  commit 371b80447ff33ddac392c189cf884a5a3e18faeb
  Author: Nicholas Piggin 
  Date:   Wed Dec 6 18:21:14 2017 +1000

  powerpc/64s: Initialize ISAv3 MMU registers before setting
  partition table

  == Regression Potential ==
  Low. This fix is specific to powerpc.  It has also been cc'd to upstream 
stable, 
  so it has had additional upstream review.


  ==Original 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] Re: Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition table

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.13.0-38.43

---
linux (4.13.0-38.43) artful; urgency=medium

  * linux: 4.13.0-38.43 -proposed tracker (LP: #1755762)

  * Servers going OOM after updating kernel from 4.10 to 4.13 (LP: #1748408)
- i40e: Fix memory leak related filter programming status
- i40e: Add programming descriptors to cleaned_count

  * [SRU] Lenovo E41 Mic mute hotkey is not responding (LP: #1753347)
- platform/x86: ideapad-laptop: Increase timeout to wait for EC answer

  * fails to dump with latest kpti fixes (LP: #1750021)
- kdump: write correct address of mem_section into vmcoreinfo

  * headset mic can't be detected on two Dell machines (LP: #1748807)
- ALSA: hda/realtek - Support headset mode for ALC215/ALC285/ALC289
- ALSA: hda - Fix headset mic detection problem for two Dell machines
- ALSA: hda - Fix a wrong FIXUP for alc289 on Dell machines

  * CIFS SMB2/SMB3 does not work for domain based DFS (LP: #1747572)
- CIFS: make IPC a regular tcon
- CIFS: use tcon_ipc instead of use_ipc parameter of SMB2_ioctl
- CIFS: dump IPC tcon in debug proc file

  * i2c-thunderx: erroneous error message "unhandled state: 0" (LP: #1754076)
- i2c: octeon: Prevent error message on bus error

  * hisi_sas: Add disk LED support (LP: #1752695)
- scsi: hisi_sas: directly attached disk LED feature for v2 hw

  * EDAC, sb_edac: Backport 1 patch to Ubuntu 17.10 (Fix missing DIMM sysfs
entries with KNL SNC2/SNC4 mode) (LP: #1743856)
- EDAC, sb_edac: Fix missing DIMM sysfs entries with KNL SNC2/SNC4 mode

  * [regression] Colour banding and artefacts appear system-wide on an Asus
Zenbook UX303LA with Intel HD 4400 graphics (LP: #1749420)
- drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA

  * DVB Card with SAA7146 chipset not working (LP: #1742316)
- vmalloc: fix __GFP_HIGHMEM usage for vmalloc_32 on 32b systems

  * [Asus UX360UA] battery status in unity-panel is not changing when battery is
being charged (LP: #1661876) // AC adapter status not detected on Asus
ZenBook UX410UAK (LP: #1745032)
- ACPI / battery: Add quirk for Asus UX360UA and UX410UAK

  * ASUS UX305LA - Battery state not detected correctly (LP: #1482390)
- ACPI / battery: Add quirk for Asus GL502VSK and UX305LA

  * support thunderx2 vendor pmu events (LP: #1747523)
- perf pmu: Extract function to get JSON alias map
- perf pmu: Pass pmu as a parameter to get_cpuid_str()
- perf tools arm64: Add support for get_cpuid_str function.
- perf pmu: Add helper function is_pmu_core to detect PMU CORE devices
- perf vendor events arm64: Add ThunderX2 implementation defined pmu core
  events
- perf pmu: Add check for valid cpuid in perf_pmu__find_map()

  * lpfc.ko module doesn't work (LP: #1746970)
- scsi: lpfc: Fix loop mode target discovery

  * Ubuntu 17.10 crashes on vmalloc.c (LP: #1739498)
- powerpc/mm/book3s64: Make KERN_IO_START a variable
- powerpc/mm/slb: Move comment next to the code it's referring to
- powerpc/mm/hash64: Make vmalloc 56T on hash

  * ethtool -p fails to light NIC LED on HiSilicon D05 systems (LP: #1748567)
- net: hns: add ACPI mode support for ethtool -p

  * CVE-2017-17807
- KEYS: add missing permission check for request_key() destination

  * [Artful SRU] Fix capsule update regression (LP: #1746019)
- efi/capsule-loader: Reinstate virtual capsule mapping

  * [Artful/Bionic] [Config] enable EDAC_GHES for ARM64 (LP: #1747746)
- Ubuntu: [Config] enable EDAC_GHES for ARM64

  * linux-tools: perf incorrectly linking libbfd (LP: #1748922)
- SAUCE: tools -- add ability to disable libbfd
- [Packaging] correct disablement of libbfd

  * Cherry pick c96f5471ce7d for delayacct fix (LP: #1747769)
- delayacct: Account blkio completion on the correct task

  * Error in CPU frequency reporting when nominal and min pstates are same
(cpufreq) (LP: #1746174)
- cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin

  * retpoline abi files are empty on i386 (LP: #1751021)
- [Packaging] retpoline-extract -- instantiate retpoline files for i386
- [Packaging] final-checks -- sanity checking ABI contents
- [Packaging] final-checks -- check for empty retpoline files

  * [P9,Power NV][WSP][Ubuntu 1804] : "Kernel access of bad area " when grouping
different pmu events using perf fuzzer . (perf:) (LP: #1746225)
- powerpc/perf: Fix oops when grouping different pmu events

  * bnx2x_attn_int_deasserted3:4323 MC assert! (LP: #1715519) //
CVE-2018-126
- net: create skb_gso_validate_mac_len()
- bnx2x: disable GSO where gso_size is too big for hardware

  * Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition
table (LP: #1736145)
- powerpc/64s: Initialize ISAv3 MMU registers before setting partition table

  * powerpc/powernv: Flush console before platform error reboot (LP: #1735159)
- 

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

[Stefan Bader]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
artful' to 'verification-done-artful'. If the problem still exists,
change the tag 'verification-needed-artful' to 'verification-failed-
artful'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-artful

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

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

Status in The Ubuntu-power-systems project:
  Fix Committed
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==
  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.

  This commit was included in mailine as of v4.15-rc5 and fixes commit
  7e381c0ff618.

  == Fix ==
  commit 371b80447ff33ddac392c189cf884a5a3e18faeb
  Author: Nicholas Piggin 
  Date:   Wed Dec 6 18:21:14 2017 +1000

  powerpc/64s: Initialize ISAv3 MMU registers before setting
  partition table

  == Regression Potential ==
  Low. This fix is specific to powerpc.  It has also been cc'd to upstream 
stable, 
  so it has had additional upstream review.


  ==Original 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

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1736145] Re: Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition table

[Manoj Iyer]

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

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

Status in The Ubuntu-power-systems project:
  Fix Committed
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==
  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.

  This commit was included in mailine as of v4.15-rc5 and fixes commit
  7e381c0ff618.

  == Fix ==
  commit 371b80447ff33ddac392c189cf884a5a3e18faeb
  Author: Nicholas Piggin 
  Date:   Wed Dec 6 18:21:14 2017 +1000

  powerpc/64s: Initialize ISAv3 MMU registers before setting
  partition table

  == Regression Potential ==
  Low. This fix is specific to powerpc.  It has also been cc'd to upstream 
stable, 
  so it has had additional upstream review.


  ==Original 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

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1736145] Re: Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition table

[Kleber Sacilotto de Souza]

** Changed in: linux (Ubuntu Artful)
   Status: In Progress => Fix Committed

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

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==
  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.

  This commit was included in mailine as of v4.15-rc5 and fixes commit
  7e381c0ff618.

  == Fix ==
  commit 371b80447ff33ddac392c189cf884a5a3e18faeb
  Author: Nicholas Piggin 
  Date:   Wed Dec 6 18:21:14 2017 +1000

  powerpc/64s: Initialize ISAv3 MMU registers before setting
  partition table

  == Regression Potential ==
  Low. This fix is specific to powerpc.  It has also been cc'd to upstream 
stable, 
  so it has had additional upstream review.


  ==Original 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

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1736145] Re: Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition table

[Manoj Iyer]

** Tags removed: triage-a
** Tags added: triage-g

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

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

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==
  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.

  This commit was included in mailine as of v4.15-rc5 and fixes commit
  7e381c0ff618.

  == Fix ==
  commit 371b80447ff33ddac392c189cf884a5a3e18faeb
  Author: Nicholas Piggin 
  Date:   Wed Dec 6 18:21:14 2017 +1000

  powerpc/64s: Initialize ISAv3 MMU registers before setting
  partition table

  == Regression Potential ==
  Low. This fix is specific to powerpc.  It has also been cc'd to upstream 
stable, 
  so it has had additional upstream review.


  ==Original 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

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1736145] Re: Ubuntu16.04.03: ISAv3 initialize MMU registers before setting partition table

[Joseph Salisbury]

SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-February/089997.html

** Description changed:

+ == SRU Justification ==
+ 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.
+ 
+ This commit was included in mailine as of v4.15-rc5 and fixes commit
+ 7e381c0ff618.
+ 
+ == Fix ==
+ commit 371b80447ff33ddac392c189cf884a5a3e18faeb
+ Author: Nicholas Piggin 
+ Date:   Wed Dec 6 18:21:14 2017 +1000
+ 
+ powerpc/64s: Initialize ISAv3 MMU registers before setting partition
+ table
+ 
+ == Regression Potential ==
+ Low. This fix is specific to powerpc.  It has also been cc'd to upstream 
stable, 
+ so it has had additional upstream review.
+ 
+ 
+ ==Original 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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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1736145

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

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==
  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.

  This commit was included in mailine as of v4.15-rc5 and fixes commit
  7e381c0ff618.

  == Fix ==
  commit 371b80447ff33ddac392c189cf884a5a3e18faeb
  Author: Nicholas Piggin 
  Date:   Wed Dec 6 18:21:14 2017 +1000

  powerpc/64s: Initialize ISAv3 MMU registers before setting
  partition table

  == Regression Potential ==
  Low. This fix is specific to powerpc.  It has also been cc'd to upstream 
stable, 
  so it has had additional upstream review.


  ==Original 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 - 

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

[Joseph Salisbury]

I built an Artful test kernel with commit 371b80447ff33dd.  The test kernel can 
be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1736145

Can you test this kernel and see if it resolves this bug?

Note, to test this kernel, you need to install both the linux-image and
linux-image-extra .deb packages.

Thanks in advance!

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

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  Fix Committed

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

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: Triaged => In Progress

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

** Changed in: linux (Ubuntu Artful)
   Status: New => In Progress

** Changed in: linux (Ubuntu Artful)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Artful)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Also affects: linux (Ubuntu Bionic)
   Importance: High
 Assignee: Joseph Salisbury (jsalisbury)
   Status: In Progress

** Changed in: linux (Ubuntu Bionic)
   Status: In Progress => Fix Committed

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

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  Fix Committed

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

[Manoj Iyer]

** Tags removed: triage-g
** Tags added: triage-a

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

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

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

[Frank Heimes]

** Tags added: kernel-da-key

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

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

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

[Joseph Salisbury]

I don't see the patch in linux-next yet.  Can you post a comment here
when the patch lands upstream?  When it does, I'll build test kernels
and start the SRU process.

** Changed in: linux (Ubuntu)
   Status: New => Triaged

** Changed in: linux (Ubuntu)
 Assignee: Canonical Kernel Team (canonical-kernel-team) => Joseph 
Salisbury (jsalisbury)

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

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

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

[Manoj Iyer]

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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

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

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

[Andrew Cloke]

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

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

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

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

[Manoj Iyer]

** Changed in: linux (Ubuntu)
 Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => 
Canonical Kernel Team (canonical-kernel-team)

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

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

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

[Andrew Cloke]

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

** Tags added: triage-g

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

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

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

Status in The Ubuntu-power-systems project:
  New
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

To manage notifications about this bug go to:
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