On Wed, Apr 18, 2018 at 07:20:10PM +0300, Michael S. Tsirkin wrote:
> On Wed, Apr 18, 2018 at 08:47:10AM +0530, Anshuman Khandual wrote:
> > On 04/15/2018 05:41 PM, Christoph Hellwig wrote:
> > > On Fri, Apr 06, 2018 at 06:37:18PM +1000, Benjamin Herrenschmidt wrote:
> > implemented as DMA API
On Wed, Apr 18, 2018 at 08:47:10AM +0530, Anshuman Khandual wrote:
> On 04/15/2018 05:41 PM, Christoph Hellwig wrote:
> > On Fri, Apr 06, 2018 at 06:37:18PM +1000, Benjamin Herrenschmidt wrote:
> implemented as DMA API which the virtio core understands. There is no
> need for an IOMMU to
On 04/15/2018 05:41 PM, Christoph Hellwig wrote:
> On Fri, Apr 06, 2018 at 06:37:18PM +1000, Benjamin Herrenschmidt wrote:
implemented as DMA API which the virtio core understands. There is no
need for an IOMMU to be involved for the device representation in this
case IMHO.
>>>
>>> T
On Fri, Apr 06, 2018 at 06:37:18PM +1000, Benjamin Herrenschmidt wrote:
> > > implemented as DMA API which the virtio core understands. There is no
> > > need for an IOMMU to be involved for the device representation in this
> > > case IMHO.
> >
> > This whole virtio translation issue is a mess.
On Fri, 2018-04-06 at 00:16 -0700, Christoph Hellwig wrote:
> On Fri, Apr 06, 2018 at 08:23:10AM +0530, Anshuman Khandual wrote:
> > On 04/06/2018 02:48 AM, Benjamin Herrenschmidt wrote:
> > > On Thu, 2018-04-05 at 21:34 +0300, Michael S. Tsirkin wrote:
> > > > > In this specific case, because that
On Fri, Apr 06, 2018 at 08:23:10AM +0530, Anshuman Khandual wrote:
> On 04/06/2018 02:48 AM, Benjamin Herrenschmidt wrote:
> > On Thu, 2018-04-05 at 21:34 +0300, Michael S. Tsirkin wrote:
> >>> In this specific case, because that would make qemu expect an iommu,
> >>> and there isn't one.
> >>
> >>
On 04/06/2018 02:48 AM, Benjamin Herrenschmidt wrote:
> On Thu, 2018-04-05 at 21:34 +0300, Michael S. Tsirkin wrote:
>>> In this specific case, because that would make qemu expect an iommu,
>>> and there isn't one.
>>
>>
>> I think that you can set iommu_platform in qemu without an iommu.
>
> No I
On Thu, 2018-04-05 at 21:34 +0300, Michael S. Tsirkin wrote:
> > In this specific case, because that would make qemu expect an iommu,
> > and there isn't one.
>
>
> I think that you can set iommu_platform in qemu without an iommu.
No I mean the platform has one but it's not desirable for it to b
On Fri, Apr 06, 2018 at 01:09:43AM +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2018-04-05 at 17:54 +0300, Michael S. Tsirkin wrote:
> > On Thu, Apr 05, 2018 at 08:09:30PM +0530, Anshuman Khandual wrote:
> > > On 04/05/2018 04:26 PM, Anshuman Khandual wrote:
> > > > There are certian platforms wh
On Thu, 2018-04-05 at 17:54 +0300, Michael S. Tsirkin wrote:
> On Thu, Apr 05, 2018 at 08:09:30PM +0530, Anshuman Khandual wrote:
> > On 04/05/2018 04:26 PM, Anshuman Khandual wrote:
> > > There are certian platforms which would like to use SWIOTLB based DMA API
> > > for bouncing purpose without a
On Thu, Apr 05, 2018 at 08:09:30PM +0530, Anshuman Khandual wrote:
> On 04/05/2018 04:26 PM, Anshuman Khandual wrote:
> > There are certian platforms which would like to use SWIOTLB based DMA API
> > for bouncing purpose without actually requiring an IOMMU back end. But the
> > virtio core does not
On 04/05/2018 04:26 PM, Anshuman Khandual wrote:
> There are certian platforms which would like to use SWIOTLB based DMA API
> for bouncing purpose without actually requiring an IOMMU back end. But the
> virtio core does not allow such mechanism. Right now DMA MAP API is only
> selected for devices
On 04/05/2018 04:44 PM, Balbir Singh wrote:
> On Thu, Apr 5, 2018 at 8:56 PM, Anshuman Khandual
> wrote:
>> There are certian platforms which would like to use SWIOTLB based DMA API
>> for bouncing purpose without actually requiring an IOMMU back end. But the
>> virtio core does not allow such mec
On Thu, Apr 5, 2018 at 8:56 PM, Anshuman Khandual
wrote:
> There are certian platforms which would like to use SWIOTLB based DMA API
> for bouncing purpose without actually requiring an IOMMU back end. But the
> virtio core does not allow such mechanism. Right now DMA MAP API is only
> selected fo
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