stable - 5.10.10
mainline - 4.9.253
mainline - 5.4.92
mainline - 4.14.217
mainline - 4.19.170
mainline - 4.4.253
mainline - 5.11-rc4
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CONFIG_ARM64_ERRATUM_1508412 is not available for the default architecture x86.
Result is shown for architecture arm64
Cortex-A77: 1508412: workaround deadlock on sequence of NC/Device load and store exclusive or PAR read
Linux Kernel Configuration
└─> Kernel Features
└─> ARM errata workarounds via the alternatives framework
└─> Cortex-A77: 1508412: workaround deadlock on sequence of NC/Device load and store exclusive or PAR read
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
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.
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