linux-kernel - Re: [PATCHv3 09/17] x86/mm: Implement page_keyid() using page

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Message-ID: <169af1d8-7fb6-5e1a-4f34-0150570018cc@intel.com>
Date:   Wed, 13 Jun 2018 11:20:10 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv3 09/17] x86/mm: Implement page_keyid() using page_ext

> +int page_keyid(const struct page *page)
> +{
> +	if (mktme_status != MKTME_ENABLED)
> +		return 0;
> +
> +	return lookup_page_ext(page)->keyid;
> +}
> +EXPORT_SYMBOL(page_keyid);

Please start using a proper X86_FEATURE_* flag for this.  It will give
you all the fancy static patching that you are missing by doing it this way.