Re: [libvirt-users] PCI-Passthrough suddenly stopped working

On 07/11/2012 04:24 PM, Rouven Sacha wrote: This may be the result of a security fix in the new kernel. I know at least one older version of Intel chips has a bug where IOMMU can be exploited by a guest to take control over the host, so on those chips, newer kernels now require to explicitly enable a kernel module parameter to state that you are going to allow passthrough to the guest in spite of the security risk. That is, you may need to use: modprobe kvm allow_unsafe_assigned_interrupts=1 with your newer kernel. Unfortunately, I wasn't able to find a better URL to a page documenting this issue, so that implies we probably also need a patch to the libvirt documentation with regards to using device passthrough. -- Eric Blake eblake(a)redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org