Displaying 9 results from an estimated 9 matches for "f_iommu".
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2018 Apr 05
1
[PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
...done in one thread, the update in another one.
>
> I think this isn't something that could be solved by adding a lock,
> unless host waits for the driver's ACK about finishing the update
> (this is not agreed in the QEMU part discussion).
>
> Actually virtio_balloon has F_IOMMU_PLATFORM disabled, maybe we don't
> need to worry about that using DMA api case (we only have gpa added to
> the vq, and having some entries stay in the vq seems fine). For this
> feature, I think it would not work with F_IOMMU enabled either.
Adding a code comment explaining all this...
2018 Apr 05
2
[PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
On Thu, Apr 05, 2018 at 02:05:03AM +0000, Wang, Wei W wrote:
> On Thursday, April 5, 2018 9:12 AM, Michael S. Tsirkin wrote:
> > On Thu, Apr 05, 2018 at 12:30:27AM +0000, Wang, Wei W wrote:
> > > On Wednesday, April 4, 2018 10:08 PM, Michael S. Tsirkin wrote:
> > > > On Wed, Apr 04, 2018 at 10:07:51AM +0800, Wei Wang wrote:
> > > > > On 04/04/2018 02:47
2018 Apr 05
2
[PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
On Thu, Apr 05, 2018 at 02:05:03AM +0000, Wang, Wei W wrote:
> On Thursday, April 5, 2018 9:12 AM, Michael S. Tsirkin wrote:
> > On Thu, Apr 05, 2018 at 12:30:27AM +0000, Wang, Wei W wrote:
> > > On Wednesday, April 4, 2018 10:08 PM, Michael S. Tsirkin wrote:
> > > > On Wed, Apr 04, 2018 at 10:07:51AM +0800, Wei Wang wrote:
> > > > > On 04/04/2018 02:47
2018 Apr 05
0
[PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
...i
>
> The comparison is done in one thread, the update in another one.
I think this isn't something that could be solved by adding a lock, unless host waits for the driver's ACK about finishing the update (this is not agreed in the QEMU part discussion).
Actually virtio_balloon has F_IOMMU_PLATFORM disabled, maybe we don't need to worry about that using DMA api case (we only have gpa added to the vq, and having some entries stay in the vq seems fine). For this feature, I think it would not work with F_IOMMU enabled either.
If there is any further need (I couldn't think of a...
2018 Aug 06
4
[RFC 0/4] Virtio uses DMA API for all devices
...me as the DMA
ops of any other PCI device who *do* use the iommu).
Otherwise, the harder option would be for us to hack so that
xen_domain() returns true in our setup (gross), and have the arch code,
when it sets up PCI device DMA ops, have a gross hack to identify
virtio PCI devices, checks their F_IOMMU flag itself, and sets up the
different ops at that point.
As for those "special" ops, they are of course just normal swiotlb ops,
there's nothing "special" other that they aren't the ops that other PCI
device on that bus use.
Cheers,
Ben.
2018 Aug 06
4
[RFC 0/4] Virtio uses DMA API for all devices
...me as the DMA
ops of any other PCI device who *do* use the iommu).
Otherwise, the harder option would be for us to hack so that
xen_domain() returns true in our setup (gross), and have the arch code,
when it sets up PCI device DMA ops, have a gross hack to identify
virtio PCI devices, checks their F_IOMMU flag itself, and sets up the
different ops at that point.
As for those "special" ops, they are of course just normal swiotlb ops,
there's nothing "special" other that they aren't the ops that other PCI
device on that bus use.
Cheers,
Ben.
2018 Aug 06
0
[RFC 0/4] Virtio uses DMA API for all devices
...Christoph might have specific ideas about it.
> Otherwise, the harder option would be for us to hack so that
> xen_domain() returns true in our setup (gross), and have the arch code,
> when it sets up PCI device DMA ops, have a gross hack to identify
> virtio PCI devices, checks their F_IOMMU flag itself, and sets up the
> different ops at that point.
>
> As for those "special" ops, they are of course just normal swiotlb ops,
> there's nothing "special" other that they aren't the ops that other PCI
> device on that bus use.
>
> Cheers,...
2018 Aug 06
4
[RFC 0/4] Virtio uses DMA API for all devices
On Mon, 2018-08-06 at 16:46 +0300, Michael S. Tsirkin wrote:
>
> > Right, we'll need some quirk to disable balloons in the guest I
> > suppose.
> >
> > Passing something from libvirt is cumbersome because the end user may
> > not even need to know about secure VMs. There are use cases where the
> > security is a contract down to some special
2018 Aug 06
4
[RFC 0/4] Virtio uses DMA API for all devices
On Mon, 2018-08-06 at 16:46 +0300, Michael S. Tsirkin wrote:
>
> > Right, we'll need some quirk to disable balloons in the guest I
> > suppose.
> >
> > Passing something from libvirt is cumbersome because the end user may
> > not even need to know about secure VMs. There are use cases where the
> > security is a contract down to some special