arm64: cpufeature: Add CPU capability for AArch32 EL1 support

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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>

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This commit is contained in:

Will Deacon 2020-04-21 15:29:17 +01:00

parent 0113340e6e

commit 540f76d12c

4 changed files with 17 additions and 11 deletions

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3

arch/arm64/include/asm/cpucaps.h

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1

arch/arm64/include/asm/sysreg.h

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12

arch/arm64/kernel/cpufeature.c

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12

arch/arm64/kvm/reset.c

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