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Date:   Fri, 4 Feb 2022 15:37:56 +0200
From:   Mike Rapoport <rppt@kernel.org>
To:     Martin Fernandez <martin.fernandez@eclypsium.com>
Cc:     linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
        platform-driver-x86@vger.kernel.org, linux-mm@kvack.org,
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        ardb@kernel.org, dvhart@infradead.org, andy@infradead.org,
        gregkh@linuxfoundation.org, rafael@kernel.org,
        akpm@linux-foundation.org, daniel.gutson@eclypsium.com,
        hughsient@gmail.com, alex.bazhaniuk@eclypsium.com,
        alison.schofield@intel.com, keescook@chromium.org
Subject: Re: [PATCH v6 6/6] drivers/node: Show in sysfs node's crypto
 capabilities
Message-ID: <Yf0sNKu1vJkIRAA3@kernel.org>
References: <20220203164328.203629-1-martin.fernandez@eclypsium.com>
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 <CAKgze5YZF09F3FTwD6kODd2RrWATutcmM5J7-wcLTK32C6aptg@mail.gmail.com>
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On Fri, Feb 04, 2022 at 09:27:42AM -0300, Martin Fernandez wrote:
> On 2/4/22, Mike Rapoport <rppt@kernel.org> wrote:
> > On Thu, Feb 03, 2022 at 01:43:28PM -0300, Martin Fernandez wrote:
> >> +Description:
> >> +		This value is 1 if all system memory in this node is
> >> +		marked with EFI_MEMORY_CPU_CRYPTO, indicating that the
> >
> > It didn't jump at me at previous postings, but other architectures won't
> > necessary have EFI_MEMORY_CPU_CRYPTO marking crypto-capable memory.
> >
> > How about
> >
> >   This value is 1 if all system memory in this node is capable of being
> >   protected with the CPU's memory cryptographic capabilities. It is 0
> >   otherwise.
> >   On EFI architectures with value corresponds to EFI_MEMORY_CPU_CRYPTO.
> >
> >
> 
> Yes, sounds good to me.
> 
> Is there other architecture with something similar to this? Or are you
> thinking on the possibility of such architecture?

AFAIU, s390 and powerpc have memory encryption capabilities, I don't know
the details though. 

-- 
Sincerely yours,
Mike.