linux-kernel - Re: [RFC, PATCH 21/22] x86/mm: Introduce page_keyid() and page

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Date:   Mon, 5 Mar 2018 09:08:53 -0800
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>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC, PATCH 21/22] x86/mm: Introduce page_keyid() and
 page_encrypted()

On 03/05/2018 08:26 AM, Kirill A. Shutemov wrote:
> +static inline bool page_encrypted(struct page *page)
> +{
> +	/* All pages with non-zero KeyID are encrypted */
> +	return page_keyid(page) != 0;
> +}

Is this true?  I thought there was a KEYID_NO_ENCRYPT "Do not encrypt
memory when this KeyID is in use."  Is that really only limited to key 0.