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

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Date:   Thu, 12 Oct 2017 06:39:48 -0400 (EDT)
From:   Pankaj Gupta <pagupta@...hat.com>
To:     Stefan Hajnoczi <stefanha@...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 <dan.j.williams@...el.com>, riel@...hat.com,
        haozhong zhang <haozhong.zhang@...el.com>, nilal@...hat.com,
        kwolf@...hat.com, pbonzini@...hat.com,
        ross zwisler <ross.zwisler@...el.com>, david@...hat.com,
        xiaoguangrong eric <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.

Sure! will prepare and share.

Thanks,
Pankaj
 
> 
> The VIRTIO Technical Committee resources and mailing lists are here:
> 
> https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=virtio#feedback
> 
> Stefan
>