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Subject: Re: [RFC PATCH 1/2] x86: Don't let pgprot_modify() change the page
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To:     Christoph Hellwig <hch@infradead.org>
Cc:     Dave Hansen <dave.hansen@intel.com>, linux-kernel@vger.kernel.org,
        x86@kernel.org, pv-drivers@vmware.com,
        Thomas Hellstrom <thellstrom@vmware.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        =?UTF-8?Q?Christian_K=c3=b6nig?= <christian.koenig@amd.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Tom Lendacky <thomas.lendacky@amd.com>
References: <20190905103541.4161-1-thomas_os@shipmail.org>
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 <b84d1dca-4542-a491-e585-a96c9d178466@shipmail.org>
 <20190905152438.GA18286@infradead.org>
From:   =?UTF-8?Q?Thomas_Hellstr=c3=b6m_=28VMware=29?= 
        <thomas_os@shipmail.org>
Organization: VMware Inc.
Message-ID: <86b48953-69a2-c211-2b48-b796c07426bc@shipmail.org>
Date:   Thu, 5 Sep 2019 18:40:59 +0200
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On 9/5/19 5:24 PM, Christoph Hellwig wrote:
> On Thu, Sep 05, 2019 at 05:21:24PM +0200, Thomas Hellström (VMware) wrote:
>> On 9/5/19 4:15 PM, Dave Hansen wrote:
>>> Hi Thomas,
>>>
>>> Thanks for the second batch of patches!  These look much improved on all
>>> fronts.
>> Yes, although the TTM functionality isn't in yet. Hopefully we won't have to
>> bother you with those though, since this assumes TTM will be using the dma
>> API.
> Please take a look at dma_mmap_prepare and dma_mmap_fault in this
> branch:
>
> 	http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-mmap-improvements
>
> they should allow to fault dma api pages in the page fault handler.  But
> this is totally hot off the press and not actually tested for the last
> few patches.  Note that I've also included your two patches from this
> series to handle SEV.

Thanks, Christoph.

I'll get to this tomorrow.

/Thomas