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

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Message-ID: <20180828083540.GH15508@linux.intel.com>
Date:   Tue, 28 Aug 2018 11:35:40 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     x86@...nel.org, platform-driver-x86@...r.kernel.org,
        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 Mon, Aug 27, 2018 at 02:15:34PM -0700, Dave Hansen wrote:
> 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)?

KVM has its own implementation for these operations.

/Jarkko