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Use of VM_IOREMAP in xenbus

To: Wei Liu <wei.liu2@xxxxxxxxxx>
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 9 Apr 2020 08:18:46 +0200
Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Konrad Wilk <konrad.wilk@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Bob Liu <bob.liu@xxxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Delivery-date: Thu, 09 Apr 2020 06:19:08 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

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?

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