[PATCH 0/3] Disable vhost device IOTLB is IOMMU is not enabled

[Jason Wang <jasowang@redhat.com>]

Hi:

We currently try to enable device IOTLB when iommu_platform is
set. This may lead unnecessary trasnsactions between qemu and vhost
when vIOMMU is not used (which is the typical case for the encrypted
VM).

So patch tries to use transport specific method to detect the enalbing
of vIOMMU and enable the device IOTLB only if vIOMMU is enalbed.

Please review.

Thanks

Jason Wang (3):
  virtio-bus: introduce iommu_enabled()
  virtio-pci: implement iommu_enabled()
  vhost: correctly detect the enabling IOMMU

 hw/virtio/vhost.c              |  2 +-
 hw/virtio/virtio-bus.c         | 14 ++++++++++++++
 hw/virtio/virtio-pci.c         | 14 ++++++++++++++
 include/hw/virtio/virtio-bus.h |  4 +++-
 4 files changed, 32 insertions(+), 2 deletions(-)

-- 
2.25.1