linux-kernel - Re: [PATCH RFC] x86/sgx: Use a heap allocated list head for unsanitized pages

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Message-ID: <c387b67e-7545-db72-25f7-7e368dddd75d@intel.com>
Date:   Mon, 5 Sep 2022 20:20:18 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>, linux-sgx@...r.kernel.org
Cc:     Haitao Huang <haitao.huang@...ux.intel.com>,
        Vijay Dhanraj <vijay.dhanraj@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Kai Huang <kai.huang@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] x86/sgx: Use a heap allocated list head for
 unsanitized pages

On 9/5/22 20:12, Jarkko Sakkinen wrote:
> Allocate the list head for the unsanitized pages from heap, and transfer
> its to ownership to ksgxd, which takes care of destroying it. Remove
> sgx_dirty_page_list, as a global list is no longer required.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> ---
> Depends on https://lore.kernel.org/linux-sgx/20220906000221.34286-1-jarkko@kernel.org/T/#t
> Would this be plausible?
> ---
>  arch/x86/kernel/cpu/sgx/main.c | 44 ++++++++++++++++++++++++----------
>  1 file changed, 31 insertions(+), 13 deletions(-)

What's the benefit?  I guess it saves 16 bytes of kernel image for ~20
lines of code.  Does it add more than 16 bytes to kernel text? ;)