search for: f_iommu_platform

...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 might be...

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

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

...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 need so f...

From: Thiago Jung Bauermann <bauerman at linux.ibm.com> Normally, virtio enables DMA API with VIRTIO_F_IOMMU_PLATFORM, which must be set by both device and guest driver. However, as a hack, when DMA API returns physical addresses, guest driver can use the DMA API; even though device does not set VIRTIO_F_IOMMU_PLATFORM and just uses physical addresses. Doing this works-around POWER secure guests for which only th...

From: Thiago Jung Bauermann <bauerman at linux.ibm.com> Normally, virtio enables DMA API with VIRTIO_F_IOMMU_PLATFORM, which must be set by both device and guest driver. However, as a hack, when DMA API returns physical addresses, guest driver can use the DMA API; even though device does not set VIRTIO_F_IOMMU_PLATFORM and just uses physical addresses. Doing this works-around POWER secure guests for which only th...