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| author |   Will Deacon <will.deacon@arm.com> | 2017-11-14 14:38:19 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-12-11 13:41:06 +0000 |
| commit | ea1e3de85e94d711f63437c04624aa0e8de5c8b3 (patch) | |
| tree | f390c46a0ddda1975269041456090a1f09e1ba35 /arch/arm64/include/asm/cpucaps.h | |
| parent | arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native tasks (diff) | |
| download | linux-dev-ea1e3de85e94d711f63437c04624aa0e8de5c8b3.tar.xz linux-dev-ea1e3de85e94d711f63437c04624aa0e8de5c8b3.zip | |
arm64: entry: Add fake CPU feature for unmapping the kernel at EL0
Allow explicit disabling of the entry trampoline on the kernel command
line (kpti=off) by adding a fake CPU feature (ARM64_UNMAP_KERNEL_AT_EL0)
that can be used to toggle the alternative sequences in our entry code and
avoid use of the trampoline altogether if desired. This also allows us to
make use of a static key in arm64_kernel_unmapped_at_el0().
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpucaps.h')
| -rw-r--r-- | arch/arm64/include/asm/cpucaps.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index 2ff7c5e8efab..b4537ffd1018 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -41,7 +41,8 @@ #define ARM64_WORKAROUND_CAVIUM_30115 20 #define ARM64_HAS_DCPOP 21 #define ARM64_SVE 22 +#define ARM64_UNMAP_KERNEL_AT_EL0 23 -#define ARM64_NCAPS 23 +#define ARM64_NCAPS 24 #endif /* __ASM_CPUCAPS_H */ |