On Thu, 27 May 2021 16:05:11 +0100,
Pavel Tatashin <[email protected]> wrote:
>
> The hyp-stub's elx_sync code fits in the vector.
>
> With this, all of the hyp-stubs behaviour is contained in its vectors.
> This lets kexec and hibernate copy the hyp-stub when they need its
> behaviour, instead of re-implementing it.
>
> Co-developed-by: James Morse <[email protected]>
> Signed-off-by: Pavel Tatashin <[email protected]>
> ---
> arch/arm64/kernel/hyp-stub.S | 64 +++++++++++++++++++-----------------
> 1 file changed, 33 insertions(+), 31 deletions(-)
>
> diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
> index 18a97bee3779..86af6c4e52b9 100644
> --- a/arch/arm64/kernel/hyp-stub.S
> +++ b/arch/arm64/kernel/hyp-stub.S
> @@ -21,6 +21,37 @@ SYM_CODE_START_LOCAL(\label)
> .align 7
> b \label
> SYM_CODE_END(\label)
> +.endm
> +
> +.macro elx_sync_vector label
> +SYM_CODE_START_LOCAL(\label)
> + .align 7
> + cmp x0, #HVC_SET_VECTORS
> + b.ne 1f
> + msr vbar_el2, x1
> + b 9f
> +
> +1: cmp x0, #HVC_VHE_RESTART
> + b.eq mutate_to_vhe
Now that this has turned into a macro, what are the guarantees that
mutate_to_vhe will be within reach of the site where this macro is
expanded? It does work here, but what about the other expansion sites
that will show up later in the series?
What was wrong with directly branching to the original call site?
Nothing in the commit message explains it.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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