On Wed 14.Sep'16 at 7:17:45 -0600, Alex Williamson wrote: > On Wed, 14 Sep 2016 15:00:37 +0200 > Paolo Bonzini <pbonzini at redhat.com> wrote: > > > On 14/09/2016 14:35, Sandro Bonazzola wrote: > > > FYI > > > > > > > > > ---------- Forwarded message ---------- > > > From: *C. L. Martinez* <carlopmart at gmail.com <mailto:carlopmart at gmail.com>> > > > Date: Tue, Sep 13, 2016 at 11:29 AM > > > Subject: [CentOS-virt] Error doing PCI passthrough on CentOS 7.2 > > > To: centos-virt at centos.org <mailto:centos-virt at centos.org> > > > > > > > > > Hi all, > > > > > > I am trying to configure a kvm guest using pci passthrough to pass it a > > > wireless pci adapter (host is my personal laptop). But when I try to > > > start it: > > > > > > error: Failed to start domain obsdfw > > > error: unsupported configuration: host doesn't support passthrough of > > > host PCI devices > > > > What's the libvirt XML for the domain? > > > > > PCI passthrough is enabled: > > > > > > [ 0.000000] Command line: > > > BOOT_IMAGE=/vmlinuz-3.10.0-327.28.3.el7.x86_64 > > > root=UUID=48220e4e-228c-42d9-a0af-482c2fc7c008 ro crashkernel=auto rhgb > > > quiet intel_iommu=on > > > [ 0.000000] Kernel command line: > > > BOOT_IMAGE=/vmlinuz-3.10.0-327.28.3.el7.x86_64 > > > root=UUID=48220e4e-228c-42d9-a0af-482c2fc7c008 ro crashkernel=auto rhgb > > > quiet intel_iommu=on > > > > > > And supported according dmesg output: > > > > > > root at lapdev01# dmesg | grep IOM > > > [ 0.000000] Intel-IOMMU: enabled > > > > Is the VFIO module installed, and can you see IOMMU groups in "ls -lR > > /dev/vfio"? > > What's the host processor model? If this is the only line you see, > chances are your processor doesn't support VT-d, this line is just an > acknowledgment of the intel_iommu=on parameter, it doesn't indicate > that it's really enabled as it implies. The line you need to see is: > > DMAR: Intel(R) Virtualization Technology for Directed I/O > > Find your processor on http://ark.intel.com/ and look for VT-d > support. Thanks, > > Alex Oops .. You are right Alex. My processor doesn't support VT-d according to Intel. Many thanks for your help. -- Greetings, C. L. Martinez