linux-kernel - Re: [PATCH V3 17/30] x86/sgx: Support modifying SGX page type

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Date:   Tue, 5 Apr 2022 10:05:59 -0700
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 V3 17/30] x86/sgx: Support modifying SGX page type

Hi Jarkko,

On 4/5/2022 8:34 AM, Jarkko Sakkinen wrote:
> On Tue, 2022-04-05 at 10:06 +0300, Jarkko Sakkinen wrote:

>>>
>>
>> To be coherent with other names, this should be
>> SGX_IOC_ENCLAVE_MODIFY_TYPES.

This is not such a clear change request to me:

SGX_IOC_ENCLAVE_ADD_PAGES - add multiple pages
SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS - restrict multiple permissions
SGX_IOC_ENCLAVE_REMOVE_PAGES - remove multiple pages
SGX_IOC_ENCLAVE_MODIFY_TYPE - set a single type

Perhaps it should rather be SGX_IOC_ENCLAVE_SET_TYPE to indicate that
there is a single target type as opposed to the possibility
of multiple source types (TCS and regular pages can be trimmed).

> 
> This should take only page type given that flags are zeroed:
> 
> EPCM(DS:RCX).R := 0;
> EPCM(DS:RCX).W := 0;
> EPCM(DS:RCX).X := 0; 
> 

ok, this was how it was done in V1 [1] and I can go back to that.


Reinette

[1] https://lore.kernel.org/linux-sgx/c0f04a8f7e1afd9e9319bb9f283db9a3187f7abc.1638381245.git.reinette.chatre@intel.com/