linux-kernel - Re: [PATCH v6 6/6] drivers/node: Show in sysfs node's crypto capabilities

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Message-ID: <Yf0sNKu1vJkIRAA3@kernel.org>
Date:   Fri, 4 Feb 2022 15:37:56 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Martin Fernandez <martin.fernandez@...ypsium.com>
Cc:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-mm@...ck.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        ardb@...nel.org, dvhart@...radead.org, andy@...radead.org,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        akpm@...ux-foundation.org, daniel.gutson@...ypsium.com,
        hughsient@...il.com, alex.bazhaniuk@...ypsium.com,
        alison.schofield@...el.com, keescook@...omium.org
Subject: Re: [PATCH v6 6/6] drivers/node: Show in sysfs node's crypto
 capabilities

On Fri, Feb 04, 2022 at 09:27:42AM -0300, Martin Fernandez wrote:
> On 2/4/22, Mike Rapoport <rppt@...nel.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.