On 2017年01月10日 12:55, Michael S. Tsirkin wrote:
On Fri, Dec 30, 2016 at 06:09:19PM +0800, Jason Wang wrote:This patches implements Device IOTLB support for vhost kernel. This is done through: 1) switch to use dma helpers when map/unmap vrings from vhost codes 2) introduce a set of VhostOps to: - setting up device IOTLB request callback - processing device IOTLB request - processing device IOTLB invalidation 2) kernel support for Device IOTLB API: - allow vhost-net to query the IOMMU IOTLB entry through eventfd - enable the ability for qemu to update a specified mapping of vhost - through ioctl. - enable the ability to invalidate a specified range of iova for the device IOTLB of vhost through ioctl. In x86/intel_iommu case this is triggered through iommu memory region notifier from device IOTLB invalidation descriptor processing routine. With all the above, kernel vhost_net can co-operate with userspace IOMMU. For vhost-user, the support could be easily done on top by implementing the VhostOps. Cc: Michael S. Tsirkin<m...@redhat.com> Signed-off-by: Jason Wang<jasow...@redhat.com>Specifically this patch is the one causing issues.
Yes, this is because it tries to enable device IOTLB for vhost-user. Will post a new version for this patch.
Thanks
