Merge remote-tracking branch 'origin/f33' into f33-user-thl-vanilla-fedorakernel-5.10.6-350.vanilla.knurd.1.fc33

1 files changed, 29 insertions, 0 deletions

diff --git a/configs/fedora/generic/arm/aarch64/CONFIG_ARM64_ERRATUM_1508412 b/configs/fedora/generic/arm/aarch64/CONFIG_ARM64_ERRATUM_1508412
new file mode 100644
index 000000000..749f590b1
--- /dev/null
+++ b/configs/fedora/generic/arm/aarch64/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