Public bug reported:
== Comment: #0 - Satheesh Rajendran <sathe...@in.ibm.com> - 2018-04-04 08:58:54
==
---Problem Description---
backport needed for spectre/meltdown mitigation machine type qemu patches
Reason:
For mitigating spectre/meltdown cpu vulnerability, qemu implements the machine
capabilities cfpc,sbbc,ibs, which are present in the current qemu, but the
default values of it would be broken(no mitigation) even fixes in hw/fw/sw is
available.
Qemu further introduces machine type variant pseries-2.12-sxxm which
would set bydefault below capabilities without need of explicitly
mentioning it, if mitigation is available in fw/sw. which is missing
needs a backport.
kvm -M pseries,help 2>&1|egrep 'cap-cfpc|cap-sbbc|cap-ibs
pseries-bionic.cap-sbbc=string (Speculation Barrier Bounds Checking (broken,
workaround, fixed)(null))
pseries-bionic.cap-cfpc=string (Cache Flush on Privilege Change (broken,
workaround, fixed)(null))
pseries-bionic.cap-ibs=string (Indirect Branch Serialisation (broken,
workaround, fixed)(null))
Upstream qemu Commits:
813f3cf655 ppc/spapr-caps: Define the pseries-2.12-sxxm machine type
c76c0d3090 ppc/spapr-caps: Convert cap-ibs to custom spapr-cap
aaf265ffde ppc/spapr-caps: Convert cap-sbbc to custom spapr-cap
f27aa81e72 ppc/spapr-caps: Convert cap-cfpc to custom spapr-cap
87175d1bc5 ppc/spapr-caps: Add support for custom spapr_capabilities
cb931c2108 target/ppc: Check mask when setting cap_ppc_safe_indirect_branch
Contact Information = sathe...@in.ibm.com
---uname output---
4.15.0-14-generic #15-Ubuntu SMP Mon Apr 2 19:47:43 UTC 2018
Machine Type = power9 boston 2.2 (pvr 004e 1202)
---Debugger---
A debugger is not configured
Userspace tool common name: qemu-kvm
1:2.11+dfsg-1ubuntu5
The userspace tool has the following bit modes: both
Userspace rpm: qemu-kvm 1:2.11+dfsg-
1ubuntu5
Userspace tool obtained from project website: na
*Additional Instructions for sathe...@in.ibm.com:
-Attach ltrace and strace of userspace application.
** Affects: qemu (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-166426 severity-critical
targetmilestone-inin---
** Tags added: architecture-ppc64le bugnameltc-166426 severity-critical
targetmilestone-inin---
** Changed in: ubuntu
Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage
(ubuntu-power-triage)
** Package changed: ubuntu => qemu (Ubuntu)
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https://bugs.launchpad.net/bugs/1761372
Title:
backport needed for spectre/meltdown mitigation machine type qemu
patches (kvm)
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