linux-kernel - Re: [PATCH v3] x86/sgx: Synchronize encl->srcu in sgx_encl

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Message-ID: <20210113180033.GG16960@zn.tnic>
Date:   Wed, 13 Jan 2021 19:00:33 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Jarkko Sakkinen <jarkko@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Haitao Huang <haitao.huang@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Jethro Beekman <jethro@...tanix.com>
Subject: Re: [PATCH v3] x86/sgx: Synchronize encl->srcu in sgx_encl_release().

On Wed, Jan 13, 2021 at 09:46:02AM -0800, Paul E. McKenney wrote:

< Lemme trim that mail fat >

> It seems to me that loading and unloading SGX enclaves qualifies as a
> configuration operation, so use of synchronize_srcu_expedited() should be
> just fine in that case.  This of course implies that SGX enclaves should
> not be loaded or unloaded while an aggressive real-time application
> is running.  Which might well be the case for other reasons.

I believe RT and SGX should be orthogonal to each-other unless someone rolls out
of the woodwork, wanting to run realtime enclaves... Ewww.

> So I believe synchronize_srcu_expedited() should be fine in this case.

Thx.

-- 
Regards/Gruss,
    Boris.

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