On 10/11/2012 05:34 PM, Michael S. Tsirkin wrote: > On Thu, Oct 11, 2012 at 04:35:23PM +0200, Avi Kivity wrote: >> On 10/11/2012 04:35 PM, Michael S. Tsirkin wrote: >> >> >> No, qemu should configure virtio devices to bypass the iommu, even if it >> >> is on. >> > >> > Okay so there will be some API that virtio devices should call >> > to achieve this? >> >> The iommu should probably call pci_device_bypasses_iommu() to check for >> such devices. > > So maybe this patch should depend on the introduction of such > an API.
I've dropped it for now. In fact, virtio/vhost are safe since they use cpu_physical_memory_rw() and the memory listener watches address_space_memory, no iommu there. vfio needs to change to listen to pci_dev->bus_master_as, and need special handling for iommu regions (abort for now, type 2 iommu later). -- error compiling committee.c: too many arguments to function
