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| author | Daniel Kiss <daniel.kiss@arm.com> | 2021-06-13 11:26:32 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-06-15 11:32:31 +0100 |
| commit | d053e71ac8442d4fd24fb85591489813cdb56365 (patch) | |
| tree | 442db612f4fa71991b35f56b2a3e683da4211702 /arch/arm64/Kconfig | |
| parent | b27a9f4119afa460289cd327f403e2ec9c8e0511 (diff) | |
| download | linux-d053e71ac8442d4fd24fb85591489813cdb56365.tar.gz | |
arm64: Conditionally configure PTR_AUTH key of the kernel.
If the kernel is not compiled with CONFIG_ARM64_PTR_AUTH_KERNEL=y, then no PACI/AUTI instructions are expected while the kernel is running so the kernel's key will not be used. Write of a system registers is expensive therefore avoid if not required. Signed-off-by: Daniel Kiss <daniel.kiss@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20210613092632.93591-3-daniel.kiss@arm.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 489e3e42320f..dabe9b81012f 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1503,7 +1503,7 @@ config ARM64_PTR_AUTH not be selected. config ARM64_PTR_AUTH_KERNEL - bool + bool "Use pointer authentication for kernel" default y depends on ARM64_PTR_AUTH depends on (CC_HAS_SIGN_RETURN_ADDRESS || CC_HAS_BRANCH_PROT_PAC_RET) && AS_HAS_PAC |