As far as I gather, the restrictions put in place by UEFI secure boot are roughly equivalent to CAP_COMPROMISE_KERNEL, and selinux has a policy called "compromise_kernel" that also checks for and prevents the same operations. Assignment of host hardware to guests in qemu-kvm via its "-device pci-assign" option is known to fail on systems with UEFI secure boot. However, even on systems that don't have a UEFI BIOS,pci-assign is no longer working as of Fedora 18 unless the following three steps are taken (this is assuming that qemu-kvm is run by libvirtd): 1) clear_emulator_capabilies is set to 0 in /etc/libvirt/qemu.conf 2) qemu-kvm is run as root rather than as user qemu 3) selinux is set to permissive mode. Items 1 and 2 can be solved in libvirt by making sure that CAP_COMPROMISE_KERNEL is set when pci passthrough will be required. Item 3 currently has no solution other than a blankete disabling of selinux, which is obviously not desired. The solution would be to either unconditionally, or possibly as the result of an selinux boolean called virt_allow_compromise_kernel_t (or something like that), not check for [whatever compromise_kernel checks for] in processes that are svirt_t. Without such a change, PCI passthrough will no longer work in F18+.
Looks like this is fixed in selinux-policy-3.11.1-70.fc18.src.rpm But Dan Berrange asked me to make this the default and remove virt_use_sysfs altogether, which is fine with me. c02f1786d5176b0367494d27280d036996c77cdc fixes this.
selinux-policy-3.11.1-108.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/selinux-policy-3.11.1-108.fc18
Package selinux-policy-3.11.1-108.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing selinux-policy-3.11.1-108.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-23716/selinux-policy-3.11.1-108.fc18 then log in and leave karma (feedback).
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selinux-policy-3.11.1-108.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.