linux-kernel - Re: Use of VM

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Message-ID: <20200409142813.lbxembj7b63b2wmi@debian>
Date:   Thu, 9 Apr 2020 15:28:13 +0100
From:   Wei Liu <wl@....org>
To:     Jürgen Groß <jgross@...e.com>
Cc:     Christoph Hellwig <hch@....de>, Wei Liu <wl@....org>,
        Bob Liu <bob.liu@...cle.com>,
        "Durrant, Paul" <pdurrant@...zon.com>,
        Konrad Wilk <konrad.wilk@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: Use of VM_IOREMAP in xenbus

Hi Christoph

On Thu, Apr 09, 2020 at 08:37:48AM +0200, Jürgen Groß wrote:
> Adjusting recipient list (dropping David, new mail addresses for Wei and
> Paul).
> 
> On 09.04.20 08:18, Christoph Hellwig wrote:
> > Hi Wei,
> > 
> > commit ccc9d90a9a8b5 ("xenbus_client: Extend interface to support
> > multi-page ring") addes a use of vmap in what is now
> > xenbus_map_ring_valloc_hvm, and uses the VM_IOREMAP flag that is
> > only really intended for implementing ioremap.  Do you remember
> > what the reason is that this flag was used?
> > 

I don't remember the reason. I can that flag can be dropped per your
reasoning.

Wei.

> 
> Juergen