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| author | Justin M. Forbes <jforbes@fedoraproject.org> | 2021-01-11 11:52:31 -0600 |
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| committer | Justin M. Forbes <jforbes@fedoraproject.org> | 2021-01-11 11:52:31 -0600 |
| commit | e18a08842c58c529ffcf0a8bca80776a5e14b3d5 (patch) | |
| tree | 83db9c03d774065a0ab73b2a8c644333d80ef36e /configs/fedora/generic/CONFIG_ARM64_ERRATUM_1508412 | |
| parent | f045479ce000b81ed889c0dfcfbf2581f2860ad6 (diff) | |
| download | kernel-e18a08842c58c529ffcf0a8bca80776a5e14b3d5.tar.gz kernel-e18a08842c58c529ffcf0a8bca80776a5e14b3d5.tar.xz kernel-e18a08842c58c529ffcf0a8bca80776a5e14b3d5.zip | |
Linux v5.10.6
Signed-off-by: Justin M. Forbes <jforbes@fedoraproject.org>
Diffstat (limited to 'configs/fedora/generic/CONFIG_ARM64_ERRATUM_1508412')
| -rw-r--r-- | configs/fedora/generic/CONFIG_ARM64_ERRATUM_1508412 | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/configs/fedora/generic/CONFIG_ARM64_ERRATUM_1508412 b/configs/fedora/generic/CONFIG_ARM64_ERRATUM_1508412 new file mode 100644 index 000000000..749f590b1 --- /dev/null +++ b/configs/fedora/generic/CONFIG_ARM64_ERRATUM_1508412 @@ -0,0 +1,29 @@ +# CONFIG_ARM64_ERRATUM_1508412: +# +# This option adds a workaround for Arm Cortex-A77 erratum 1508412. +# +# Affected Cortex-A77 cores (r0p0, r1p0) could deadlock on a sequence +# of a store-exclusive or read of PAR_EL1 and a load with device or +# non-cacheable memory attributes. The workaround depends on a firmware +# counterpart. +# +# KVM guests must also have the workaround implemented or they can +# deadlock the system. +# +# Work around the issue by inserting DMB SY barriers around PAR_EL1 +# register reads and warning KVM users. The DMB barrier is sufficient +# to prevent a speculative PAR_EL1 read. +# +# If unsure, say Y. +# +# Symbol: ARM64_ERRATUM_1508412 [=y] +# Type : bool +# Defined at arch/arm64/Kconfig:639 +# Prompt: Cortex-A77: 1508412: workaround deadlock on sequence of NC/Device load and store exclusive or PAR read +# Location: +# -> Kernel Features +# -> ARM errata workarounds via the alternatives framework +# +# +# +CONFIG_ARM64_ERRATUM_1508412=y |