Re: [libvirt] [PATCH] tools/virt-host-validate: Fix IOMMU check on s390x

When running virt-host-validate on an s390x host, the tool currently warns that it is "Unknown if this platform has IOMMU support". We can use the common check for entries in sys/kernel/iommu_groups here, too, but it only makes sense to check it if there are also PCI devices available. It's also common on s390x that there are no PCI devices assigned to the LPAR, and in that case there is no need for the PCI-related IOMMU, so without PCI devices we should simply skip this test. Signed-off-by: Thomas Huth <thuth(a)redhat.com&gt;