linux-kernel - Re: [PATCH v2 3/4] drm/ttm, drm/vmwgfx: Correctly support support AMD memory encryption

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Message-ID: <e13accfc-cde8-754c-1730-0f2db4e2dd2e@shipmail.org>
Date:   Wed, 4 Sep 2019 15:05:53 +0200
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     "Koenig, Christian" <Christian.Koenig@....com>,
        Dave Hansen <dave.hansen@...el.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        "pv-drivers@...are.com" <pv-drivers@...are.com>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 3/4] drm/ttm, drm/vmwgfx: Correctly support support AMD
 memory encryption

On 9/4/19 2:35 PM, Thomas Hellström (VMware) wrote:
>
>>
>> I've already talked with Christoph that we probably want to switch TTM
>> over to using that instead to also get rid of the ttm_io_prot() hack.
>
> OK, would that mean us ditching other memory modes completely? And 
> on-the-fly caching transitions? or is it just for the special case of 
> cached coherent memory? Do we need to cache the coherent kernel 
> mappings in TTM as well, for ttm_bo_kmap()?

Reading this again, I wanted to point out that I'm not against this. 
Just curious.

/Thomas