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| author | Will Deacon <will@kernel.org> | 2020-04-21 15:29:17 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-04-28 14:23:23 +0100 |
| commit | 540f76d12c662d3da2ebdf0086ee289123fcd120 (patch) | |
| tree | 8dab996c565a7e539b613949c1d575ce42820711 /arch/arm64/include/asm/sysreg.h | |
| parent | 0113340e6e83f8710b216f72b826499fc0151c29 (diff) | |
| download | linux-540f76d12c662d3da2ebdf0086ee289123fcd120.tar.gz linux-540f76d12c662d3da2ebdf0086ee289123fcd120.tar.bz2 linux-540f76d12c662d3da2ebdf0086ee289123fcd120.zip | |
arm64: cpufeature: Add CPU capability for AArch32 EL1 support
Although we emit a "SANITY CHECK" warning and taint the kernel if we
detect a CPU mismatch for AArch32 support at EL1, we still online the
CPU with disastrous consequences for any running 32-bit VMs.
Introduce a capability for AArch32 support at EL1 so that late onlining
of incompatible CPUs is forbidden.
Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200421142922.18950-4-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/sysreg.h')
| -rw-r--r-- | arch/arm64/include/asm/sysreg.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index d7181972d28d..c4e896bf77f3 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -655,6 +655,7 @@ #define ID_AA64PFR0_ASIMD_NI 0xf #define ID_AA64PFR0_ASIMD_SUPPORTED 0x0 #define ID_AA64PFR0_EL1_64BIT_ONLY 0x1 +#define ID_AA64PFR0_EL1_32BIT_64BIT 0x2 #define ID_AA64PFR0_EL0_64BIT_ONLY 0x1 #define ID_AA64PFR0_EL0_32BIT_64BIT 0x2 |