Re: [PATCH for_v29 v2 0/5] x86/sgx: Make vDSO callable from C

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On Wed, Apr 1, 2020 at 4:18 AM Jarkko Sakkinen
<jarkko.sakkinen@xxxxxxxxxxxxxxx> wrote:
>
> On Tue, Mar 31, 2020 at 09:40:24AM -0400, Nathaniel McCallum wrote:
> > On Tue, Mar 31, 2020 at 7:58 AM Jarkko Sakkinen
> > <jarkko.sakkinen@xxxxxxxxxxxxxxx> wrote:
> > >
> > > On Mon, Mar 30, 2020 at 05:42:29PM -0400, Nathaniel McCallum wrote:
> > > > On Mon, Mar 30, 2020 at 4:48 PM Jarkko Sakkinen
> > > > <jarkko.sakkinen@xxxxxxxxxxxxxxx> wrote:
> > > > >
> > > > > On Mon, Mar 30, 2020 at 11:08:06AM -0700, Sean Christopherson wrote:
> > > > > > Nathaniel pointed out that __vdso_sgx_enter_enclave() is tantalizingly
> > > > > > close to being callable from C (with caveats and a cooperative enclave).
> > > > > > The missing pieces are preserving %rbx and taking @leaf as a standard
> > > > > > parameter.
> > > > > >
> > > > > > v2:
> > > > > >   - Rebase to Jarkko's latest master, commit 402fb35a477a, "docs: ...")
> > > > > >   - Add CFI directive for RBX. [Cedric]
> > > > >
> > > > > I'm sorry for throwing stick's constantly but I think having a real
> > > > > ELF loader is for better.
> >
> > This statement seems like you are juxtaposing having
> > __vdso_sgx_enter_enclave() be potentially C-compatible with having an
> > ELF-loader. These are not incompabile. __vdso_sgx_enter_enclave() can
> > be C-callable *and* you can have an ELF loader.
>
> I'm not honestly sure what this is about but my comment was about heavy
> rebasing of the GIT tree as I rewrote the selftest last week.

Okay. Let's chalk it up to miscommunication then. :)




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