diff options
| author | Justin M. Forbes <jforbes@fedoraproject.org> | 2020-12-18 13:19:08 -0600 |
|---|---|---|
| committer | Justin M. Forbes <jforbes@fedoraproject.org> | 2020-12-18 13:19:08 -0600 |
| commit | 14ee173c279442e3546682022e462844c70b0bc4 (patch) | |
| tree | c058e8d6595e0bc126894c54c66223190b41b6f1 /configs/fedora/generic/CONFIG_ARM64_ERRATUM_1508412 | |
| parent | 9c80b51f739afa911f89b32f63e951140f653ee5 (diff) | |
| download | kernel-14ee173c279442e3546682022e462844c70b0bc4.tar.gz kernel-14ee173c279442e3546682022e462844c70b0bc4.tar.xz kernel-14ee173c279442e3546682022e462844c70b0bc4.zip | |
Linux v5.10.1 rebase
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 |