Displaying 20 results from an estimated 10000 matches similar to: "[PATCH] virtio: Try to untangle DMA coherency"
2017 Feb 01
3
[PATCH] virtio: Try to untangle DMA coherency
On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> On Wed, Feb 01, 2017 at 12:25:57PM +0000, Robin Murphy wrote:
> > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> > index 7e38ed79c3fc..961af25b385c 100644
> > --- a/drivers/virtio/virtio_ring.c
> > +++ b/drivers/virtio/virtio_ring.c
> > @@ -20,6 +20,7 @@
> >
2017 Feb 01
3
[PATCH] virtio: Try to untangle DMA coherency
On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> On Wed, Feb 01, 2017 at 12:25:57PM +0000, Robin Murphy wrote:
> > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> > index 7e38ed79c3fc..961af25b385c 100644
> > --- a/drivers/virtio/virtio_ring.c
> > +++ b/drivers/virtio/virtio_ring.c
> > @@ -20,6 +20,7 @@
> >
2017 Feb 08
2
[PATCH] virtio: Try to untangle DMA coherency
On 02/01/2017 08:19 PM, Michael S. Tsirkin wrote:
> On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
>> On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
>>> On Wed, Feb 01, 2017 at 12:25:57PM +0000, Robin Murphy wrote:
>>>> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
>>>> index
2017 Feb 08
2
[PATCH] virtio: Try to untangle DMA coherency
On 02/01/2017 08:19 PM, Michael S. Tsirkin wrote:
> On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
>> On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
>>> On Wed, Feb 01, 2017 at 12:25:57PM +0000, Robin Murphy wrote:
>>>> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
>>>> index
2017 Feb 02
3
[PATCH v2 1/2] virtio: Make ARM SMMU workaround more specific
Whilst always using the DMA API is OK on ARM systems in most cases,
there can be a problem if a hypervisor fails to tell its guest that a
virtio device is cache-coherent. In that case, the guest will end up
making non-cacheable mappings for DMA buffers (i.e. the vring), which,
if the host is using a cacheable view of the same buffer on the other
end, is not a recipe for success.
It turns out that
2017 Feb 02
3
[PATCH v2 1/2] virtio: Make ARM SMMU workaround more specific
Whilst always using the DMA API is OK on ARM systems in most cases,
there can be a problem if a hypervisor fails to tell its guest that a
virtio device is cache-coherent. In that case, the guest will end up
making non-cacheable mappings for DMA buffers (i.e. the vring), which,
if the host is using a cacheable view of the same buffer on the other
end, is not a recipe for success.
It turns out that
2017 Feb 01
0
[PATCH] virtio: Try to untangle DMA coherency
On Wed, Feb 01, 2017 at 12:25:57PM +0000, Robin Murphy wrote:
> By forcing on DMA API usage for ARM systems, we have inadvertently
> kicked open a hornets' nest in terms of cache-coherency. Namely that
> unless the virtio device is explicitly described as capable of coherent
> DMA by firmware, the DMA APIs on ARM and other DT-based platforms will
> assume it is non-coherent.
2017 Feb 02
3
[PATCH] virtio: Try to untangle DMA coherency
On Wed, Feb 01, 2017 at 09:19:22PM +0200, Michael S. Tsirkin wrote:
> On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
> > On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> > > I'd like to do that instead. It's fastboot doing the unreasonable thing
> > > here and deviating from what every other legacy device without exception
>
2017 Feb 02
3
[PATCH] virtio: Try to untangle DMA coherency
On Wed, Feb 01, 2017 at 09:19:22PM +0200, Michael S. Tsirkin wrote:
> On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
> > On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> > > I'd like to do that instead. It's fastboot doing the unreasonable thing
> > > here and deviating from what every other legacy device without exception
>
2017 Feb 01
0
[PATCH] virtio: Try to untangle DMA coherency
On Wed, Feb 01, 2017 at 12:25:57PM +0000, Robin Murphy wrote:
> By forcing on DMA API usage for ARM systems, we have inadvertently
> kicked open a hornets' nest in terms of cache-coherency. Namely that
> unless the virtio device is explicitly described as capable of coherent
> DMA by firmware, the DMA APIs on ARM and other DT-based platforms will
> assume it is non-coherent.
2017 Feb 01
0
[PATCH] virtio: Try to untangle DMA coherency
On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
> On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> > On Wed, Feb 01, 2017 at 12:25:57PM +0000, Robin Murphy wrote:
> > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> > > index 7e38ed79c3fc..961af25b385c 100644
> > > --- a/drivers/virtio/virtio_ring.c
2017 Feb 02
2
[PATCH] virtio: Try to untangle DMA coherency
On Thu, Feb 02, 2017 at 01:34:03PM +0000, Robin Murphy wrote:
> On 02/02/17 11:26, Will Deacon wrote:
> > On Wed, Feb 01, 2017 at 09:19:22PM +0200, Michael S. Tsirkin wrote:
> >> On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
> >>> On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> >>>> I'd like to do that instead.
2017 Feb 02
2
[PATCH] virtio: Try to untangle DMA coherency
On Thu, Feb 02, 2017 at 01:34:03PM +0000, Robin Murphy wrote:
> On 02/02/17 11:26, Will Deacon wrote:
> > On Wed, Feb 01, 2017 at 09:19:22PM +0200, Michael S. Tsirkin wrote:
> >> On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
> >>> On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> >>>> I'd like to do that instead.
2017 Feb 02
3
[PATCH] virtio: Try to untangle DMA coherency
On Thu, Feb 02, 2017 at 01:34:03PM +0000, Robin Murphy wrote:
> On 02/02/17 11:26, Will Deacon wrote:
> > On Wed, Feb 01, 2017 at 09:19:22PM +0200, Michael S. Tsirkin wrote:
> >> On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
> >>> On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> >>>> I'd like to do that instead.
2017 Feb 02
3
[PATCH] virtio: Try to untangle DMA coherency
On Thu, Feb 02, 2017 at 01:34:03PM +0000, Robin Murphy wrote:
> On 02/02/17 11:26, Will Deacon wrote:
> > On Wed, Feb 01, 2017 at 09:19:22PM +0200, Michael S. Tsirkin wrote:
> >> On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
> >>> On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> >>>> I'd like to do that instead.
2017 Feb 09
3
[PATCH] virtio: Try to untangle DMA coherency
On Thu, Feb 02, 2017 at 04:40:49PM +0000, Will Deacon wrote:
> On Thu, Feb 02, 2017 at 06:30:28PM +0200, Michael S. Tsirkin wrote:
> > I am inclined to say, for 4.10 let's revert
> > c7070619f3408d9a0dffbed9149e6f00479cf43b since what it fixes is not a
> > regression in 4.10.
>
> No complaints there, as long as we can keep working to fix this for 4.11
> and
2017 Feb 09
3
[PATCH] virtio: Try to untangle DMA coherency
On Thu, Feb 02, 2017 at 04:40:49PM +0000, Will Deacon wrote:
> On Thu, Feb 02, 2017 at 06:30:28PM +0200, Michael S. Tsirkin wrote:
> > I am inclined to say, for 4.10 let's revert
> > c7070619f3408d9a0dffbed9149e6f00479cf43b since what it fixes is not a
> > regression in 4.10.
>
> No complaints there, as long as we can keep working to fix this for 4.11
> and
2017 Feb 09
2
[PATCH] virtio: Try to untangle DMA coherency
On Thu, Feb 09, 2017 at 06:31:18PM +0000, Will Deacon wrote:
> On Thu, Feb 09, 2017 at 08:17:16PM +0200, Michael S. Tsirkin wrote:
> > On Thu, Feb 02, 2017 at 04:40:49PM +0000, Will Deacon wrote:
> > > On Thu, Feb 02, 2017 at 06:30:28PM +0200, Michael S. Tsirkin wrote:
> > > > I am inclined to say, for 4.10 let's revert
> > > >
2017 Feb 09
2
[PATCH] virtio: Try to untangle DMA coherency
On Thu, Feb 09, 2017 at 06:31:18PM +0000, Will Deacon wrote:
> On Thu, Feb 09, 2017 at 08:17:16PM +0200, Michael S. Tsirkin wrote:
> > On Thu, Feb 02, 2017 at 04:40:49PM +0000, Will Deacon wrote:
> > > On Thu, Feb 02, 2017 at 06:30:28PM +0200, Michael S. Tsirkin wrote:
> > > > I am inclined to say, for 4.10 let's revert
> > > >
2017 Feb 09
0
[PATCH] virtio: Try to untangle DMA coherency
On Wed, Feb 08, 2017 at 01:58:10PM +0100, Alexander Graf wrote:
> On 02/01/2017 08:19 PM, Michael S. Tsirkin wrote:
> > On Wed, Feb 01, 2017 at 06:27:09PM +0000, Will Deacon wrote:
> > > On Wed, Feb 01, 2017 at 08:09:21PM +0200, Michael S. Tsirkin wrote:
> > > > On Wed, Feb 01, 2017 at 12:25:57PM +0000, Robin Murphy wrote:
> > > > > diff --git