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Re: [Xen-devel] [PATCH v4 0/4] virtio: Clean up scatterlists and use the DMA API
- To: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>
- From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
- Date: Wed, 29 Jul 2015 10:07:36 +0200
- Cc: "linux-s390@xxxxxxxxxxxxxxx" <linux-s390@xxxxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Stefan Hajnoczi <stefanha@xxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, xen-devel <Xen-devel@xxxxxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Cornelia Huck <cornelia.huck@xxxxxxxxxx>, "linux390@xxxxxxxxxx" <linux390@xxxxxxxxxx>, Linux Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 29 Jul 2015 08:08:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 2015-07-29 01:21, Benjamin Herrenschmidt wrote:
> On Tue, 2015-07-28 at 15:43 -0700, Andy Lutomirski wrote:
>> New QEMU
>> always advertises this feature flag. If iommu=on, QEMU's virtio
>> devices refuse to work unless the driver acknowledges the flag.
>
> This should be configurable.
Advertisement of that flag must be configurable, or we won't be able to
run older guests anymore which don't know it, thus will reject it. The
only precondition: there must be no IOMMU if we turn it off.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
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