linux-kernel - Re: [PATCH v38 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call

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Message-ID: <20200927233700.GA4450@linux.intel.com>
Date:   Mon, 28 Sep 2020 02:37:00 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        Jethro Beekman <jethro@...tanix.com>,
        Cedric Xing <cedric.xing@...el.com>, akpm@...ux-foundation.org,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com,
        chenalexchen@...gle.com, conradparker@...gle.com,
        cyhanish@...gle.com, dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, npmccallum@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v38 21/24] x86/vdso: Implement a vDSO for Intel SGX
 enclave call

On Fri, Sep 25, 2020 at 10:28:07AM +0200, Borislav Petkov wrote:
> > > I can see why you would write "TCS" though - there's a thread control
> > > structure thing too in that patch.
> > 
> > Renamed.
> 
> See Sean's reply.

I did not get Sean's reply, and neither can find it from lore:

https://lore.kernel.org/linux-sgx/20200915112842.897265-1-jarkko.sakkinen@linux.intel.com/T/#t

> >  * typedef sgx_enclave_exit_handler_t - Exit handler function accepted by
> >  *					__vdso_sgx_enter_enclave()
> >  * @rdi:	RDI snapshot
> >  * @rsi:	RSI snapshot
> >  * @rdx:	RDX snapshot
> >  * @rsp:	RSP snapshot (untrusted stack)
> >  * @r8:		R8 snapshot
> >  * @r9:		R9 snapshot
> 
> I'd say here:
> 
> "The registers' content is the snapshot made at enclave exit."

I'd make that a description and take away individual parameter
descriptions. Is that fine?

> > Also, I renamed 'r' as 'run' in some places.
> > 
> > End result:
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-sgx.git/tree/arch/x86/include/uapi/asm/sgx.h
> > 
> > I'm wondering this sentence:
> > 
> > "The calling convention is custom and does not follow System V x86-64 ABI."
> 
> Yeah, I was wondering what that meant too.

I'll refine that one based on my own and Jethro's feedback.

> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette

/Jarkko