linux-kernel - Re: [PATCH v22 02/24] x86/cpufeatures: x86/msr: Intel SGX Launch Control hardware bits

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Date:   Wed, 25 Sep 2019 17:19:49 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, haitao.huang@...el.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, josh@...htriplett.org, luto@...nel.org,
        kai.huang@...el.com, rientjes@...gle.com, cedric.xing@...el.com,
        Kai Huang <kai.huang@...ux.intel.com>,
        Haim Cohen <haim.cohen@...el.com>
Subject: Re: [PATCH v22 02/24] x86/cpufeatures: x86/msr: Intel SGX Launch
 Control hardware bits

On Wed, Sep 25, 2019 at 05:09:03PM +0300, Jarkko Sakkinen wrote:
> The driver will support only the case where the bit is set i.e. that
> it can freely write to the MSRs MSR_IA32_SGXLEPUBKEYHASH{0, 1, 2, 3}.
> It will refuse to initialize otherwise.

See this:

https://lkml.kernel.org/r/20190925085156.GA3891@zn.tnic

AFAICT, when FEATURE_CONTROL_SGX_LE_WR is not set, you're not clearing
all SGX feature bits. But you should, methinks.

> The next version will thus have only my SOB and author information will
> be changed. I doubt anyone will complain if I do that.

Ok.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette