linux-kernel - Re: [PATCH 08/25] x86/sgx: Make SGX IPI callback available internally

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Message-ID: <YavzKF3LooOmj3Un@iki.fi>
Date:   Sun, 5 Dec 2021 01:00:56 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Reinette Chatre <reinette.chatre@...el.com>
Cc:     dave.hansen@...ux.intel.com, tglx@...utronix.de, bp@...en8.de,
        luto@...nel.org, mingo@...hat.com, linux-sgx@...r.kernel.org,
        x86@...nel.org, seanjc@...gle.com, kai.huang@...el.com,
        cathy.zhang@...el.com, cedric.xing@...el.com,
        haitao.huang@...el.com, mark.shanahan@...el.com, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/25] x86/sgx: Make SGX IPI callback available internally

On Wed, Dec 01, 2021 at 11:23:06AM -0800, Reinette Chatre wrote:
> The ETRACK instruction followed by an IPI to all CPUs within an enclave
> is a common pattern with more frequent use in support of SGX2.
> 
> Make the (empty) IPI callback function available internally in
> preparation for more usages.

Please, just describe the usages that this is needed for so that
there is zero guesswork required.

/Jarkko