arm64: entry: Free up another register on kpti's tramp_exit path

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Kpti stashes x30 in far_el1 while it uses x30 for all its work.

Making the vectors a per-cpu data structure will require a second
register.

Allow tramp_exit two registers before it unmaps the kernel, by
leaving x30 on the stack, and stashing x29 in far_el1.

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>

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James Morse 2021-11-23 18:41:43 +00:00

parent d739da1694

commit 03aff3a77a

1 changed files with 13 additions and 6 deletions

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arch/arm64/kernel/entry.S

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