linux-kernel - Re: [PATCH v6 04/11] x86: define IA32_FEATUE_CONTROL.SGX

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Date:   Tue, 28 Nov 2017 22:51:41 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     platform-driver-x86@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Kyle Huey <me@...ehuey.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        Piotr Luc <piotr.luc@...el.com>,
        Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>
Subject: Re: [PATCH v6 04/11] x86: define IA32_FEATUE_CONTROL.SGX_LC

On Tue, Nov 28, 2017 at 09:16:11AM -0800, Sean Christopherson wrote:
> On Sat, 2017-11-25 at 21:29 +0200, Jarkko Sakkinen wrote:
> > When IA32_FEATURE_CONTROL.SGX_LC identifies that the root key for
> > enclave signatures can be configured either by the OS or pre-boot
> > firmware.
> > 
> > If this the case, IA32_SGXLEPUBKEYHASHn MSRs (0 < n < 4) can be used
> > to
> > set the SHA256 of the root key. IA32_FEATURE_CONTROL bit 17 controls
> > whether the MSRs are writable by the OS. The pre-boot firmware can
> > decided whether to  set this bit before setting
> > IA32_FEATURE_CONTROL.LOCK.
> 
> The commit message (feature control bit) doesn't match the patch (CPUID
> bit).

Oops. I'll move most of this the patch that defines the MSRs. I think
the latter part was meant for that I had been awake for too long time
:-) I'll fix these commit messages with extra care for v7. Thank you.

/Jarkko