* Prasad Joshi (P.G.Joshi@xxxxxxxxxxxxxxxxxxxxx) wrote: > I am facing a problem with enabling the IOMMU. > > Dec 21 15:50:57 prasad-kvm kernel: [ 0.000000] Aperture pointing to e820 RAM. Ignoring. > Dec 21 15:50:57 prasad-kvm kernel: [ 0.000000] Your BIOS doesn't leave a aperture memory hole > Dec 21 15:50:57 prasad-kvm kernel: [ 0.000000] Please enable the IOMMU option in the BIOS setup > > Dec 21 15:50:57 prasad-kvm kernel: [ 2.790913] pci 0000:01:05.0: Firmware left e100 interrupts enabled; disabling > Dec 21 15:50:57 prasad-kvm kernel: [ 2.791941] pci 0000:00:00.2: PCI INT A -> GSI 55 (level, low) -> IRQ 55 > Dec 21 15:50:57 prasad-kvm kernel: [ 2.792775] AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40 > Dec 21 15:50:57 prasad-kvm kernel: [ 2.800989] AMD-Vi: Lazy IO/TLB flushing enabled > > > I have enabled IOMMU in the BIOS, but I am not sure why it is still asking to enabled IOMMU in BIOS. Do I need to worry about this? It's unfortunate wording. It's telling you that the GART is missing, which is fine because you have an IOMMU. > Besides I don't see the DMAR message similar to the one mentioned on the link > http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM That wiki page is specific to Intel VT-d. You have an AMD box with IOMMU, so all looks fine. Are you interested in using the IOMMU to do direct PCI device assignment to a guest? thanks, -chris -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
