iasl is a build dependency of the qemu-kvm SRPM. qmeu-kvm produces the qemu-guest-agent package, which is being added to x86 trees in RHEL 6.4 as part of bug 815180. Therefore, dev86 should be added to the x86 optional repos.
# pwd /mnt/redhat/nightly/RHEL6.4-20130121.n.0/6 # find -name "iasl*" ./ComputeNode/optional/x86_64/os/Packages/iasl-20090123-3.1.el6.x86_64.rpm ./ComputeNode/optional/x86_64/debug/iasl-debuginfo-20090123-3.1.el6.x86_64.rpm ./ComputeNode/optional/source/SRPMS/iasl-20090123-3.1.el6.src.rpm ./Client/optional/i386/os/Packages/iasl-20090123-3.1.el6.i686.rpm ./Client/optional/i386/debug/iasl-debuginfo-20090123-3.1.el6.i686.rpm ./Client/optional/source/SRPMS/iasl-20090123-3.1.el6.src.rpm ./Client/optional/x86_64/os/Packages/iasl-20090123-3.1.el6.x86_64.rpm ./Client/optional/x86_64/debug/iasl-debuginfo-20090123-3.1.el6.x86_64.rpm ./Workstation/optional/i386/os/Packages/iasl-20090123-3.1.el6.i686.rpm ./Workstation/optional/i386/debug/iasl-debuginfo-20090123-3.1.el6.i686.rpm ./Workstation/optional/source/SRPMS/iasl-20090123-3.1.el6.src.rpm ./Workstation/optional/x86_64/os/Packages/iasl-20090123-3.1.el6.x86_64.rpm ./Workstation/optional/x86_64/debug/iasl-debuginfo-20090123-3.1.el6.x86_64.rpm ./Server/optional/i386/os/Packages/iasl-20090123-3.1.el6.i686.rpm ./Server/optional/i386/debug/iasl-debuginfo-20090123-3.1.el6.i686.rpm ./Server/optional/source/SRPMS/iasl-20090123-3.1.el6.src.rpm ./Server/optional/x86_64/os/Packages/iasl-20090123-3.1.el6.x86_64.rpm ./Server/optional/x86_64/debug/iasl-debuginfo-20090123-3.1.el6.x86_64.rpm
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHEA-2013-0278.html