Description of problem: The latest kernel-xen has the newly backported pci-stub driver built-in to the kernel by default. This causes a problem in handling of PCI passthrough to guest VMs, because libvirt sees that pci-stub is present and uses that. XenD in RHEL-5, however, *requires* that pciback is used and cannot work with pci-stub. It is not even possible to workaround this by blacklisting the pci-stub because it was compiled into the kernel, not built as a module. We need to turn off pci-stub for kernel-xen builds, and only have it in bare-metal builds for use with KVM Version-Release number of selected component (if applicable): Linux rhel5xen 2.6.18-146.el5xen #1 SMP Mon May 11 19:08:09 EDT 2009 i686 athlon i386 GNU/Linux How reproducible: Always Steps to Reproduce: 1. Boot kernel-xen 2. ls /sys/bus/pci/drivers 3. Actual results: pci-stub is present Expected results: pci-stub is not present, and also not built as a module Additional info:
Created attachment 344191 [details] Remove pci-stub driver from -xen kernels
in kernel-2.6.18-149.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 Please do NOT transition this bugzilla state to VERIFIED until our QE team has sent specific instructions indicating when to do so. However feel free to provide a comment indicating that this fix has been verified.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2009-1243.html