linux-kernel - Re: [RFC PATCH 0/2] Fix SEV user-space mapping of unencrypted coherent memory

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Date:   Tue, 10 Sep 2019 08:25:56 +0200
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        pv-drivers@...are.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Christian König <christian.koenig@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [RFC PATCH 0/2] Fix SEV user-space mapping of unencrypted
 coherent memory

On 9/10/19 8:11 AM, Christoph Hellwig wrote:
> On Thu, Sep 05, 2019 at 04:23:11AM -0700, Christoph Hellwig wrote:
>> This looks fine from the DMA POV.  I'll let the x86 guys comment on the
>> rest.
> Do we want to pick this series up for 5.4?  Should I queue it up in
> the dma-mapping tree?

Hi, Christoph

I think the DMA change is pretty uncontroversial.

There are still some questions about the x86 change: After digging a bit 
deeper into the mm code I think Dave is correct about that we should 
include the sme_me_mask in _PAGE_CHG_MASK.

I'll respin that patch and then I guess we need an ack from the x86 people.

Thanks,
Thomas