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
