linux-kernel - Re: [PATCH 13/25] x86/sgx: Support adding of pages to initialized enclave

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Date:   Tue, 1 Mar 2022 09:08:29 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>
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 13/25] x86/sgx: Support adding of pages to initialized
 enclave

Hi Jarkko,

On 3/1/2022 7:13 AM, Jarkko Sakkinen wrote:
> On Wed, Dec 01, 2021 at 11:23:11AM -0800, Reinette Chatre wrote:
>> diff --git a/arch/x86/kernel/cpu/sgx/encl.h b/arch/x86/kernel/cpu/sgx/encl.h
>> index 848a28d28d3d..1b6ce1da7c92 100644
>> --- a/arch/x86/kernel/cpu/sgx/encl.h
>> +++ b/arch/x86/kernel/cpu/sgx/encl.h
>> @@ -123,4 +123,6 @@ void sgx_encl_free_epc_page(struct sgx_epc_page *page);
>>  struct sgx_encl_page *sgx_encl_load_page(struct sgx_encl *encl,
>>  					 unsigned long addr);
>>  
>> +struct sgx_va_page *sgx_encl_grow(struct sgx_encl *encl);
>> +void sgx_encl_shrink(struct sgx_encl *encl, struct sgx_va_page *va_page);
>>  #endif /* _X86_ENCL_H */
>> diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c
>> index 5dddb3c9f742..de0bf68ee842 100644
>> --- a/arch/x86/kernel/cpu/sgx/ioctl.c
>> +++ b/arch/x86/kernel/cpu/sgx/ioctl.c
>> @@ -17,7 +17,7 @@
>>  #include "encl.h"
>>  #include "encls.h"
>>  
>> -static struct sgx_va_page *sgx_encl_grow(struct sgx_encl *encl)
>> +struct sgx_va_page *sgx_encl_grow(struct sgx_encl *encl)
>>  {
>>  	struct sgx_va_page *va_page = NULL;
>>  	void *err;
>> @@ -43,7 +43,7 @@ static struct sgx_va_page *sgx_encl_grow(struct sgx_encl *encl)
>>  	return va_page;
>>  }
>>  
>> -static void sgx_encl_shrink(struct sgx_encl *encl, struct sgx_va_page *va_page)
>> +void sgx_encl_shrink(struct sgx_encl *encl, struct sgx_va_page *va_page)
>>  {
>>  	encl->page_cnt--;
> 
> Nit: this should be a separate patch, e.g.
> 
>   x86/sgx: Export sgx_encl_{grow,shrink}()
> 
>   In order to use sgx_encl_{grow,shrink}() in the page augementation code
>   located in encl.c, export these functions.
> 

Sure, will do.

Reinette