linux-kernel - Re: [RFC] KVM "fake DAX" device flushing

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Message-ID: <20171012085031.GA1959@stefanha-x1.localdomain>
Date:   Thu, 12 Oct 2017 09:50:31 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Pankaj Gupta <pagupta@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        qemu-devel@...gnu.org, linux-nvdimm@...1.01.org,
        linux-mm@...ck.org, jack@...e.cz, dan.j.williams@...el.com,
        riel@...hat.com, haozhong.zhang@...el.com, nilal@...hat.com,
        kwolf@...hat.com, pbonzini@...hat.com, ross.zwisler@...el.com,
        david@...hat.com, xiaoguangrong.eric@...il.com
Subject: Re: [RFC] KVM "fake DAX" device flushing

On Thu, Oct 12, 2017 at 12:21:46AM +0530, Pankaj Gupta wrote:
> We are sharing the prototype version of 'fake DAX' flushing
> interface for the initial feedback. This is still work in progress
> and not yet ready for merging.
> 
> Protoype right now just implements basic functionality without advanced
> features with two major parts:
> 
> - Qemu virtio-pmem device
>   It exposes a persistent memory range to KVM guest which at host side is file
>   backed memory and works as persistent memory device. In addition to this it
>   provides a virtio flushing interface for KVM guest to do a Qemu side sync for
>   guest DAX persistent memory range.

Please post a draft VIRTIO device specification.

The VIRTIO Technical Committee resources and mailing lists are here:

https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=virtio#feedback

Stefan