CONFIG_ARM64_ERRATUM_3312417: Neoverse-V3: 3312417: workaround for MSR SSBS not self-synchronizing

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_3312417:

• prompt: Neoverse-V3: 3312417: workaround for MSR SSBS not self-synchronizing
• type: bool
• depends on: (none)
• defined in arch/arm64/Kconfig
• found in Linux kernels: 6.10

Help text

This option adds the workaround for ARM Neoverse-V3 erratum 3312417.

On affected cores "MSR SSBS, #0" instructions may not affect subsequent speculative instructions, which may permit unexepected speculative store bypassing.

Work around this problem by placing a speculation barrier after kernel changes to SSBS. The presence of the SSBS special-purpose register is hidden from hwcaps and EL0 reads of ID_AA64PFR1_EL1, such that userspace will use the PR_SPEC_STORE_BYPASS prctl to change SSBS.

If unsure, say Y.

Hardware

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This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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