linux-kernel - Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver

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Message-ID: <CAPcyv4iASygtEJrBL07ve3p4na_XvuoxV7yA0m4R1XfsyvNPJA@mail.gmail.com>
Date:   Fri, 20 Oct 2017 09:11:13 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Kevin Wolf <kwolf@...hat.com>, Jan Kara <jack@...e.cz>,
        xiaoguangrong eric <xiaoguangrong.eric@...il.com>,
        KVM list <kvm@...r.kernel.org>,
        Pankaj Gupta <pagupta@...hat.com>,
        Stefan Hajnoczi <stefanha@...il.com>,
        David Hildenbrand <david@...hat.com>,
        ross zwisler <ross.zwisler@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Qemu Developers <qemu-devel@...gnu.org>,
        Linux MM <linux-mm@...ck.org>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-nvdimm <linux-nvdimm@...1.01.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Nitesh Narayan Lal <nilal@...hat.com>
Subject: Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver

On Fri, Oct 20, 2017 at 9:06 AM, Christoph Hellwig <hch@...radead.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.