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Subject: Re: [RFC, PATCH 21/22] x86/mm: Introduce page_keyid() and
 page_encrypted()
To:     "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>, x86@kernel.org,
        Thomas Gleixner <tglx@linutronix.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Tom Lendacky <thomas.lendacky@amd.com>
References: <20180305162610.37510-1-kirill.shutemov@linux.intel.com>
 <20180305162610.37510-22-kirill.shutemov@linux.intel.com>
Cc:     Kai Huang <kai.huang@linux.intel.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
From:   Dave Hansen <dave.hansen@intel.com>
Message-ID: <61041640-435e-1a67-177f-a75791130514@intel.com>
Date:   Mon, 5 Mar 2018 09:08:53 -0800
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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.