linux-kernel - Re: [Qemu-devel] [RFC v2 1/2] virtio: add pmem driver

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Message-ID: <x49in8d6fum.fsf@segfault.boston.devel.redhat.com>
Date:   Thu, 26 Apr 2018 13:24:17 -0400
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Pankaj Gupta <pagupta@...hat.com>
Cc:     Dan Williams <dan.j.williams@...el.com>, Jan Kara <jack@...e.cz>,
        KVM list <kvm@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>,
        linux-nvdimm <linux-nvdimm@...1.01.org>,
        Ross Zwisler <ross.zwisler@...el.com>,
        Qemu Developers <qemu-devel@...gnu.org>,
        lcapitulino@...hat.com, Linux MM <linux-mm@...ck.org>,
        niteshnarayanlal@...mail.com,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Marcel Apfelbaum <marcel@...hat.com>,
        Nitesh Narayan Lal <nilal@...hat.com>,
        Haozhong Zhang <haozhong.zhang@...el.com>,
        Rik van Riel <riel@...riel.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Kevin Wolf <kwolf@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Igor Mammedov <imammedo@...hat.com>
Subject: Re: [Qemu-devel] [RFC v2 1/2] virtio: add pmem driver

Pankaj Gupta <pagupta@...hat.com> writes:

>> Ideally, qemu (seabios?) would advertise a platform capabilities
>> sub-table that doesn't fill in the flush bits.
>
> Could you please elaborate on this, how its related to disabling
> MAP_SYNC? We are not doing entire nvdimm device emulation. 

My mistake.  If you're not providing an NFIT, then you can ignore this
comment.  I'll have a closer look at your patches next week.

-Jeff