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Subject: Re: [PATCH] treewide: Rename "unencrypted" to "decrypted"
To:     Borislav Petkov <bp@alien8.de>
Cc:     Borislav Petkov <bp@suse.de>, lkml <linux-kernel@vger.kernel.org>,
        "Schofield, Alison" <alison.schofield@intel.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, x86@kernel.org,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
        iommu@lists.linux-foundation.org,
        Tom Lendacky <thomas.lendacky@amd.com>,
        "Shutemov, Kirill" <kirill.shutemov@intel.com>
References: <20200317111822.GA15609@zn.tnic>
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From:   Dave Hansen <dave.hansen@intel.com>
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Message-ID: <f3e520c6-f455-9c82-abfc-d014ca63eeb5@intel.com>
Date:   Tue, 17 Mar 2020 14:24:59 -0700
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On 3/17/20 2:06 PM, Borislav Petkov wrote:
> On Tue, Mar 17, 2020 at 01:35:12PM -0700, Dave Hansen wrote:
>> On 3/17/20 4:18 AM, Borislav Petkov wrote:
>>> Back then when the whole SME machinery started getting mainlined, it
>>> was agreed that for simplicity, clarity and sanity's sake, the terms
>>> denoting encrypted and not-encrypted memory should be "encrypted" and
>>> "decrypted". And the majority of the code sticks to that convention
>>> except those two. So rename them.
>> Don't "unencrypted" and "decrypted" mean different things?
>>
>> Unencrypted to me means "encryption was never used for this data".
>>
>> Decrypted means "this was/is encrypted but here is a plaintext copy".
> Maybe but linguistical semantics is not the point here.
> 
> The idea is to represent a "binary" concept of memory being encrypted
> or memory being not encrypted. And at the time we decided to use
> "encrypted" and "decrypted" for those two things.

Yeah, agreed.  We're basically trying to name "!encrypted".

> Do you see the need to differentiate a third "state", so to speak, of
> memory which was never encrypted?

No, there are just two states.  I just think the "!encrypted" case
should not be called "decrypted".