** Changed in: intel
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1786139
Title:
[GLK/CLX] Enhanced IBRS
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
Won't Fix
Status in linux source package in Xenial:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released
Status in linux source package in Disco:
Fix Released
Bug description:
Description:
[Impact]
Future Intel CPU's like Cascade Lake and GLK+ support Enhanced IBRS.
Enhanced IBRS is a H/W mitigation technique for Spectre V2 bug. So,
it's important for us to make sure that all the OSV's are using this
feature.
The patch that enables kernel support for this feature has been taken
by Thomas and it's in TIP tree. So, please back port it to all the
OSV's. Please find the patch here:
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/pti&id=706d51681d636a0c4a5ef53395ec3b803e45ed4d
[Test Case]
For processors that don't support Enhanced IBRS, the test is to ensure
that /sys/devices/system/cpu/vulnerabilities/spectre_v2 doesn't change
state after applying the patches. This will typically be the string
when running on Intel processors that don't support Enhanced IBRS:
"Mitigation: Full generic retpoline, IBPB, IBRS_FW"
New Intel processors that do support Enhanced IBRS will display
"Enhanced IBRS" in place of "Full generic retpoline"
[Regression Potential]
Pretty low. The patches are fairly simple and they should only affect
new processors. The main concern is around the possibility of
regressing IBRS support on processors that don't support Enhanced IBRS
Target Kernel:TBD
Target Release: 19.04
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