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From: Dan Williams <dan.j.williams@intel.com>
Date: Fri, 20 Oct 2017 09:11:13 -0700
Message-ID: <CAPcyv4iASygtEJrBL07ve3p4na_XvuoxV7yA0m4R1XfsyvNPJA@mail.gmail.com>
Subject: Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver
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Sender: owner-linux-mm@kvack.org
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To: Christoph Hellwig <hch@infradead.org>
Cc: Kevin Wolf <kwolf@redhat.com>, Jan Kara <jack@suse.cz>, xiaoguangrong eric <xiaoguangrong.eric@gmail.com>, KVM list <kvm@vger.kernel.org>, Pankaj Gupta <pagupta@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>, David Hildenbrand <david@redhat.com>, ross zwisler <ross.zwisler@intel.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Qemu Developers <qemu-devel@nongnu.org>, Linux MM <linux-mm@kvack.org>, Stefan Hajnoczi <stefanha@redhat.com>, linux-nvdimm <linux-nvdimm@ml01.01.org>, Paolo Bonzini <pbonzini@redhat.com>, Nitesh Narayan Lal <nilal@redhat.com>

On Fri, Oct 20, 2017 at 9:06 AM, Christoph Hellwig <hch@infradead.org> wrote:
> On Fri, Oct 20, 2017 at 08:05:09AM -0700, Dan Williams wrote:
>> Right, that's the same recommendation I gave.
>>
>>     https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg08404.html
>>
>> ...so maybe I'm misunderstanding your concern? It sounds like we're on
>> the same page.
>
> Yes, the above is exactly what I think we should do it.  And in many
> ways virtio seems overkill if we could just have a hypercall or doorbell
> page as the queueing infrastructure in virtio shouldn't really be
> needed.

Ah ok, yes, get rid of the virtio-pmem driver and just make
nvdimm_flush() do a hypercall based on region-type flag.

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