linux-kernel - Re: [PATCH V3 09/30] x86/sgx: Make sgx_ipi

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Date:   Tue, 5 Apr 2022 09:59:47 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Reinette Chatre <reinette.chatre@...el.com>
Cc:     dave.hansen@...ux.intel.com, tglx@...utronix.de, bp@...en8.de,
        luto@...nel.org, mingo@...hat.com, linux-sgx@...r.kernel.org,
        x86@...nel.org, seanjc@...gle.com, kai.huang@...el.com,
        cathy.zhang@...el.com, cedric.xing@...el.com,
        haitao.huang@...el.com, mark.shanahan@...el.com, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 09/30] x86/sgx: Make sgx_ipi_cb() available internally

On Mon, Apr 04, 2022 at 09:49:17AM -0700, Reinette Chatre wrote:
> The ETRACK function followed by an IPI to all CPUs within an enclave
> is a common pattern with more frequent use in support of SGX2.
> 
> Make the (empty) IPI callback function available internally in
> preparation for usage by SGX2.
> 
> Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
> ---
> No changes since V2
> 
> Changes since V1:
> - Replace "for more usages" by "for usage by SGX2" (Jarkko)
> 
>  arch/x86/kernel/cpu/sgx/main.c | 2 +-
>  arch/x86/kernel/cpu/sgx/sgx.h  | 2 ++
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
> index ce9e87d5f8ec..6e2cb7564080 100644
> --- a/arch/x86/kernel/cpu/sgx/main.c
> +++ b/arch/x86/kernel/cpu/sgx/main.c
> @@ -172,7 +172,7 @@ static int __sgx_encl_ewb(struct sgx_epc_page *epc_page, void *va_slot,
>  	return ret;
>  }
>  
> -static void sgx_ipi_cb(void *info)
> +void sgx_ipi_cb(void *info)
>  {
>  }
>  
> diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h
> index 0f17def9fe6f..b30cee4de903 100644
> --- a/arch/x86/kernel/cpu/sgx/sgx.h
> +++ b/arch/x86/kernel/cpu/sgx/sgx.h
> @@ -90,6 +90,8 @@ void sgx_mark_page_reclaimable(struct sgx_epc_page *page);
>  int sgx_unmark_page_reclaimable(struct sgx_epc_page *page);
>  struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim);
>  
> +void sgx_ipi_cb(void *info);
> +
>  #ifdef CONFIG_X86_SGX_KVM
>  int __init sgx_vepc_init(void);
>  #else
> -- 
> 2.25.1
> 

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

BR, Jarkko