linux-kernel - Re: [PATCH 2/2] arm64: export __hyp_stub

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Date:   Fri, 15 Nov 2019 13:00:49 +0100
From:   Ralf Ramsauer <ralf.ramsauer@...-regensburg.de>
To:     Peng Fan <peng.fan@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>
CC:     "allison@...utok.net" <allison@...utok.net>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "james.morse@....com" <james.morse@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jan.kiszka@...mens.com" <jan.kiszka@...mens.com>,
        Alice Guo <alice.guo@....com>, dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 2/2] arm64: export __hyp_stub_vectors

Hi Peng,

On 11/15/19 10:45 AM, Peng Fan wrote:
> From: Peng Fan <peng.fan@....com>
> 
> External hypervisors, like Jailhouse, need this address when they are
> deactivated, in order to restore original state.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  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[];
> +

In jailhouse, we call it:

driver/main.c:extern unsigned int __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);

_GPL?

I wrote, with the same motivation, almost the same patch a while ago:

https://github.com/siemens/linux/commit/15b46bf77bdb5c6b1889f729efc3bf424ddfad9c

Back then, I had to import asm-generic/export.h. Is it now indirectly
included?

Thanks
  Ralf

>  
>  	.align 11
>  
>