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

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Message-ID: <20210113182230.GX2743@paulmck-ThinkPad-P72>
Date:   Wed, 13 Jan 2021 10:22:30 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
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 07:00:33PM +0100, Borislav Petkov wrote:
> 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.

I could speculate about an RT workload running on a system that also
ran non-realtime SGX workloads, but who knows?  Stranger things have
happened.  ;-)

							Thanx, Paul