Re: [Qemu-devel] [PATCH v2 0/2] vfio: blacklist legacy virtio devices

Jason Wang
2016-08-30T03:16:25Z

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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