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

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Message-ID: <94f62e19a630792f78e3c48895dfb792ecb02c6c.camel@kernel.org>
Date:   Tue, 05 Apr 2022 21:41:34 +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 17/30] x86/sgx: Support modifying SGX page type

On Tue, 2022-04-05 at 10:05 -0700, Reinette Chatre wrote:
> 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.

I would name the fields as "flags" and "page_type" just to align
names with SGX instead of trying to mimim "posix names". Otherwise, 
I support that.

BR, Jarkko