arm64: context: Free up kernel ASIDs if KPTI is not in use

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We can extend user ASID space if it turns out that system does not
require KPTI. We start with kernel ASIDs reserved because CPU caps are
not finalized yet and free them up lazily on the next rollover if we
confirm than KPTI is not in use.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Vladimir Murzin 2020-01-07 10:28:03 +00:00 • committed by Will Deacon

parent edf9081827

commit f88f42f853

1 changed files with 30 additions and 8 deletions

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arch/arm64/mm/context.c

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