Re: [libvirt-users] Trouble passing PCI device in isolated IOMMU group

On 07/27/2018 11:51 AM, Quincy Wofford wrote: > I'm attempting PCI-passthrough from host to guest on an HP ProLiant > 380P, which has an outdated BIOS (2014), but it does support VT-d. I'm > running CentOS 7, kernel 3.10.0-862.9.1.el7.x86_64. > > I have an Intel 82580 NIC installed with 4 ports. Each of these ports is > in its own IOMMU group (I enabled SR-IOV at the BIOS, which might be the > reason they show up separately) > > After detaching and adding a 'hostdev' device with the appropriate pci > address, I attempt to start my VM. I get " failed to set iommu for > container: Operation not permitted". As recommended here > (http://vfio.blogspot.com/2014/08/vfiovga-faq.html) I parsed dmesg in an > attempt to find: > > ------------------- > No interrupt remapping support. Use the module param > "allow_unsafe_interrupts" to enable VFIO IOMMU support on this platform > ------------------- > ...but nothing similar exists in my logs. > > Since this device is showing up in its own IOMMU group, I assume ACS > override won't get me any further. In any case, it is not an option for > me to leave ACS override on. I can turn it on for testing, the server is > not currently in production. > > Any idea why this could be failing? If you haven't yet found a solution to this problem, I would recommend sending your question either to vfio-users(a)redhat.com, or asking in the #vfio-users channel on irc.freenode.net