On 2016年08月30日 10:27, Michael S. Tsirkin wrote:
Legacy virtio devices always bypassed an IOMMU, so using them with vfio was never safe.
And it actually won't work since GPA is assumed in the device. So I'm not sure this is must since we should get a IOMMU fault in this case.
This adds a quirk detecting these and disabling VFIO unless the noiommu mode is used. At the moment, this only applies to virtio-pci devices. The patch might make sense on stable as well. Michael S. Tsirkin (2): vfio: report group noiommu status vfio: add virtio pci quirk drivers/vfio/pci/vfio_pci_private.h | 1 + include/linux/vfio.h | 2 + drivers/vfio/pci/vfio_pci.c | 14 ++++ drivers/vfio/pci/vfio_pci_virtio.c | 140 ++++++++++++++++++++++++++++++++++++ drivers/vfio/vfio.c | 12 ++++ drivers/vfio/pci/Makefile | 1 + 6 files changed, 170 insertions(+) create mode 100644 drivers/vfio/pci/vfio_pci_virtio.c
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