arm64: entry: Add exception trampoline page for exceptions from EL0

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Commit c7b9adaf85 upstream.

To allow unmapping of the kernel whilst running at EL0, we need to
point the exception vectors at an entry trampoline that can map/unmap
the kernel on entry/exit respectively.

This patch adds the trampoline page, although it is not yet plugged
into the vector table and is therefore unused.

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>

...

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Will Deacon 2017-11-14 14:07:40 +00:00 • committed by Greg Kroah-Hartman

parent d6c414013b

commit 78422a7b51

2 changed files with 103 additions and 0 deletions

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86

arch/arm64/kernel/entry.S

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17

arch/arm64/kernel/vmlinux.lds.S

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