linux-kernel - Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again

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Message-ID: <20160201110057.GC10990@citrix.com>
Date:	Mon, 1 Feb 2016 11:00:57 +0000
From:	Wei Liu <wei.liu2@...rix.com>
To:	Andy Lutomirski <luto@...nel.org>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Joerg Roedel <jroedel@...e.de>, KVM <kvm@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>,
	"Christian Borntraeger" <borntraeger@...ibm.com>,
	David Vrabel <david.vrabel@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <sparclinux@...r.kernel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Martin Schwidefsky" <schwidefsky@...ibm.com>,
	<wei.liu2@...rix.com>
Subject: Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again

Nice work, Andy.

On Thu, Jan 28, 2016 at 06:31:13PM -0800, Andy Lutomirski wrote:
> This switches virtio to use the DMA API on Xen and if requested by
> module option.
> 
> This fixes virtio on Xen, and it should break anything because it's
> off by default on everything except Xen PV on x86.
> 

What is your setup? My understanding is that virtio doesn't work on PV
guest as of now because a suitable transport is missing.

Wei.