KVM patches for s390x to provide facility bits 81 (ppa15) and 82 (bpb)

Bug #1747090 reported by Joseph Salisbury on 2018-02-02
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Status tracked in Bionic
Xenial
High
Joseph Salisbury
Artful
High
Joseph Salisbury
Bionic
High
Joseph Salisbury

Bug Description

== SRU Justification ==
Mainline commit 35b3fde6203b9 is a KVM patch for s390x to provide facility
bits 81 (ppa15) and 82 (bpb). This is required for branch prediction behaviour
changes.

This is the public bug for SRU. There is also a priave bug report:
http://bugs.launchpad.net/bugs/1743560

There is a qemu portion to this fix:
http://patchwork.ozlabs.org/cover/862801/

== Fixes ==
Artful/Bionic:
35b3fde6203b ("KVM: s390: wire up bpb feature")

Xenial:
ed8dda0bf74b ("Enable all facility bits that are known good for passthrough")
35b3fde6203b ("KVM: s390: wire up bpb feature")

== Regression Potential ==
Low, this fix is limited to s390.

== Test Case ==
A test kernel was built with this patch and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.

Changed in linux (Ubuntu):
status: New → In Progress
importance: Undecided → High
Changed in linux (Ubuntu Artful):
status: New → In Progress
Changed in linux (Ubuntu Xenial):
status: New → In Progress
Changed in linux (Ubuntu Artful):
importance: Undecided → High
Changed in linux (Ubuntu Xenial):
importance: Undecided → High
tags: added: architecture-s39064 artful bionic bugnameltc-163626 qemu-18.04 severity-high targetmilestone-inin1604 xenial
Changed in linux (Ubuntu Artful):
assignee: nobody → Joseph Salisbury (jsalisbury)
Changed in linux (Ubuntu Xenial):
assignee: nobody → Joseph Salisbury (jsalisbury)
description: updated
description: updated
Seth Forshee (sforshee) on 2018-02-03
Changed in linux (Ubuntu Bionic):
status: In Progress → Fix Committed
Changed in linux (Ubuntu Artful):
status: In Progress → Fix Committed
Changed in linux (Ubuntu Xenial):
status: In Progress → Fix Committed

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
tags: added: verification-needed-xenial

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-xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed-xenial'.

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!

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