arm64: Add percpu vectors for EL1

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The Spectre-BHB workaround adds a firmware call to the vectors. This
is needed on some CPUs, but not others. To avoid the unaffected CPU in
a big/little pair from making the firmware call, create per cpu vectors.

The per-cpu vectors only apply when returning from EL0.

Systems using KPTI can use the canonical 'full-fat' vectors directly at
EL1, the trampoline exit code will switch to this_cpu_vector on exit to
EL0. Systems not using KPTI should always use this_cpu_vector.

this_cpu_vector will point at a vector in tramp_vecs or
__bp_harden_el1_vectors, depending on whether KPTI is in use.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>

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This commit is contained in:

James Morse 2021-11-23 18:29:25 +00:00

parent b28a8eebe8

commit bd09128d16

4 changed files with 53 additions and 9 deletions

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29

arch/arm64/include/asm/vectors.h

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11

arch/arm64/kernel/cpufeature.c

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12

arch/arm64/kernel/entry.S

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10

arch/arm64/kvm/hyp/vhe/switch.c

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