Re: [Qemu-discuss] IOMMU in kernel command line, still getting "No IOMMU found. Unable to assign device "(null)"I

[Fam Zheng]

On Wed, 01/11 20:04, Kevin Wilson wrote:
> Hello,
> I have IOMMU in the kernel command line on a server which supports Virt-d:
> 
> cat /proc/cmdline | grep -i iommu
> BOOT_IMAGE=...intel_iommu=on iommu=pt
> 
> Now when I try to start a KVM VM with qemu-system-x86_64 without any
> PCI device assignment it starts ok, and I can work with this VM just
> fine.
> 
> But when I try to add PCI device assignment to a VF (of a nic) in the
> qemu command line and launch an image, it failed with this message:
> 
> qemu-system-x86_64: -device pci-assign,host=05:00.0:  No IOMMU found.
> Unable to assign device "(null)"

Have you tried "-device vfio-pci"?

Fam