tree 161ac39a2a4c2a7552f668a3cf1edbcf5b4e35c2
parent 59f47f9dcdcde20e0a20c434f18bcc50c7c824e4
author Will Deacon <will.deacon@arm.com> 1502367549 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1518808966 +0100

arm64: mm: Move ASID from TTBR0 to TTBR1


Commit 7655abb95386 upstream.

In preparation for mapping kernelspace and userspace with different
ASIDs, move the ASID to TTBR1 and update switch_mm to context-switch
TTBR0 via an invalid mapping (the zero page).

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>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>