linux-kernel - Re: [PATCH v13 09/13] x86/sgx: Enclave Page Cache (EPC) memory manager

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Message-ID: <7c5df14e-3028-46b3-fe93-aa6ba8352317@intel.com>
Date:   Mon, 27 Aug 2018 14:15:34 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>, x86@...nel.org,
        platform-driver-x86@...r.kernel.org
Cc:     sean.j.christopherson@...el.com, nhorman@...hat.com,
        npmccallum@...hat.com, linux-sgx@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Suresh Siddha <suresh.b.siddha@...el.com>,
        Serge Ayoun <serge.ayoun@...el.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v13 09/13] x86/sgx: Enclave Page Cache (EPC) memory
 manager

On 08/27/2018 11:53 AM, Jarkko Sakkinen wrote:
> +struct sgx_epc_page_ops {
> +	bool (*get)(struct sgx_epc_page *epc_page);
> +	void (*put)(struct sgx_epc_page *epc_page);
> +	bool (*reclaim)(struct sgx_epc_page *epc_page);
> +	void (*block)(struct sgx_epc_page *epc_page);
> +	void (*write)(struct sgx_epc_page *epc_page);
> +};

Why do we need a fancy, slow (retpoline'd) set of function pointers when
we only have one user of these (the SGX driver)?