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

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Message-ID: <20171019080149.GB10089@infradead.org>
Date:   Thu, 19 Oct 2017 01:01:49 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Stefan Hajnoczi <stefanha@...il.com>,
        Pankaj Gupta <pagupta@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Wolf <kwolf@...hat.com>,
        haozhong zhang <haozhong.zhang@...el.com>,
        Jan Kara <jack@...e.cz>,
        xiaoguangrong eric <xiaoguangrong.eric@...il.com>,
        KVM list <kvm@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>,
        linux-nvdimm <linux-nvdimm@...1.01.org>,
        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>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Nitesh Narayan Lal <nilal@...hat.com>
Subject: Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver

On Wed, Oct 18, 2017 at 08:51:37AM -0700, Dan Williams wrote:
> This use case is not "Persistent Memory". Persistent Memory is
> something you can map and make persistent with CPU instructions.
> Anything that requires a driver call is device driver managed "Shared
> Memory".

How is this any different than the existing nvdimm_flush()? If you
really care about the not driver thing it could easily be a write
to a doorbell page or a hypercall, but in the end that's just semantics.