Re: [PATCH 2/2] arm64: export __hyp_stub_vectors

[Jan Kiszka]

On 15.11.19 10:45, Peng Fan wrote:
> From: Peng Fan <peng.fan@xxxxxxx>
>
> External hypervisors, like Jailhouse, need this address when they are
> deactivated, in order to restore original state.
>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
>   arch/arm64/include/asm/virt.h | 2 ++
>   arch/arm64/kernel/hyp-stub.S  | 1 +
>   2 files changed, 3 insertions(+)
>
> diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h
> index 0958ed6191aa..b1b48353e3b3 100644
> --- a/arch/arm64/include/asm/virt.h
> +++ b/arch/arm64/include/asm/virt.h
> @@ -62,6 +62,8 @@
>    */
>   extern u32 __boot_cpu_mode[2];
>   
> +extern char __hyp_stub_vectors[];
> +
>   void __hyp_set_vectors(phys_addr_t phys_vector_base);
>   void __hyp_reset_vectors(void);
>   
> diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
> index f17af9a39562..22b728fb14bd 100644
> --- a/arch/arm64/kernel/hyp-stub.S
> +++ b/arch/arm64/kernel/hyp-stub.S
> @@ -38,6 +38,7 @@ ENTRY(__hyp_stub_vectors)
>   	ventry	el1_fiq_invalid			// FIQ 32-bit EL1
>   	ventry	el1_error_invalid		// Error 32-bit EL1
>   ENDPROC(__hyp_stub_vectors)
> +EXPORT_SYMBOL(__hyp_stub_vectors);
>   
>   	.align 11
>   

While I would not dislike to have patch-free access in Jailhouse, I'm 
not sure if an out-of-tree use case justifies this an export.

Also, this lacks the arm equivalent to be complete.

Jan

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