This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1787993
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1787993
Title:
[Bionic] Spectre v4 mitigation (Speculative Store Bypass Disable)
support for arm64 using SMC firmware call to set a hardware chicken
bit
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
Track: Spectre v4 mitigation (Speculative Store Bypass Disable) support for
arm64 using SMC firmware call to set a hardware chicken bit. Patch now in 4.18
to Bionic.
[Test]
[Fix]
http://lkml.iu.edu/hypermail/linux/kernel/1805.2/05868.html
-- From 4.18 --
eff0e9e1078e arm/arm64: smccc: Add SMCCC-specific return codes
8e2906245f1e arm64: Call ARCH_WORKAROUND_2 on transitions between EL0 and EL1
5cf9ce6e5ea5 arm64: Add per-cpu infrastructure to call ARCH_WORKAROUND_2
a725e3dda181 arm64: Add ARCH_WORKAROUND_2 probing
a43ae4dfe56a arm64: Add 'ssbd' command-line option
c32e1736ca03 arm64: ssbd: Add global mitigation state accessor
986372c4367f arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation
647d0519b53f arm64: ssbd: Restore mitigation status on CPU resume
9dd9614f5476 arm64: ssbd: Introduce thread flag to control userspace
mitigation
85478bab4091 arm64: KVM: Add HYP per-cpu accessors
55e3748e8902 arm64: KVM: Add ARCH_WORKAROUND_2 support for guests the first
line
b4f18c063a13 arm64: KVM: Handle guest's ARCH_WORKAROUND_2 requests
5d81f7dc9bca arm64: KVM: Add ARCH_WORKAROUND_2 discovery through
ARCH_FEATURES_FUNC_ID
[Regression Potential]
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