linux-kernel - Re: [PATCH v6 06/11] intel_sgx: driver for Intel Software Guard Extensions

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Date:   Sun, 26 Nov 2017 19:33:56 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     platform-driver-x86@...r.kernel.org, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>
Subject: Re: [PATCH v6 06/11] intel_sgx: driver for Intel Software Guard
 Extensions

> +struct sgx_encl_page {
> +	unsigned long addr;
> +	unsigned int flags;
> +	void *epc_page;
> +	struct sgx_va_page *va_page;
> +	unsigned int va_offset;
> +	struct list_head list;
> +};

This can be without major streches hoops packed way more. There are 12
bits free for use in the addr field. I can use low three bits for flags
and upper nine bits for va_offset.

I think I can also quite easily union epc_page and va_page fields.

With these changes the struct would shrink to:

struct sgx_encl_page {
	unsigned long addr;
	union {
		void *epc_page;
		struct sgx_va_page *va_page;
	};
	struct list_head list;
};

I can rework this for v7.

/Jarkko