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

[Jarkko Sakkinen]

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@xxxxxxxxxxxxxxx/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