Hello I have recently had to reinstall Centos 7.5 to on host computer. I have not be able to set-up qemu to support the q35 chip set. I have several virtual machines that require q35. This is not my first install, I have configured libvirt on many machines in the past, it just worked, it has not required any manual configuration. [root at sj aadmin]# /usr/libexec/qemu-kvm -machine help Supported machines are: none empty machine pc RHEL 7.0.0 PC (i440FX + PIIX, 1996) (alias of pc-i440fx-rhel7.0.0) pc-i440fx-rhel7.0.0 RHEL 7.0.0 PC (i440FX + PIIX, 1996) (default) rhel6.6.0 RHEL 6.6.0 PC rhel6.5.0 RHEL 6.5.0 PC rhel6.4.0 RHEL 6.4.0 PC rhel6.3.0 RHEL 6.3.0 PC rhel6.2.0 RHEL 6.2.0 PC rhel6.1.0 RHEL 6.1.0 PC rhel6.0.0 RHEL 6.0.0 PC I have add the jenkins repository. and installed the following packages, OVMF.noarch 20171011-4.git92d07e48907f.el7 @base edk2.git.x86_64 0-20180612.181.g2aedaaef8a @qemu-firmware-jenkins edk2.git-aarch64.noarch 0-20180612.181.g2aedaaef8a @qemu-firmware-jenkins edk2.git-arm.noarch 0-20180612.181.g2aedaaef8a @qemu-firmware-jenkins edk2.git-ovmf-x64.noarch 0-20180612.181.g2aedaaef8a @qemu-firmware-jenkins edk2.git-tools.x86_64 0-20180612.181.g2aedaaef8a @qemu-firmware-jenkins coreboot.git.x86_64 4.8-599.333.g1bf411c743 @qemu-firmware-jenkins coreboot.git-tools.x86_64 4.8-599.333.g1bf411c743 @qemu-firmware-jenkins qemu-common.x86_64 2:2.0.0-1.el7.6 @epel qemu-guest-agent.x86_64 10:2.8.0-2.el7 @anaconda qemu-img.x86_64 10:1.5.3-156.el7_5.2 @updates qemu-kvm.x86_64 10:1.5.3-156.el7_5.2 @updates qemu-kvm-common.x86_64 10:1.5.3-156.el7_5.2 @updates qemu-kvm-tools.x86_64 10:1.5.3-156.el7_5.2 @updates qemu-system-alpha.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-arm.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-cris.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-lm32.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-m68k.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-microblaze.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-mips.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-moxie.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-or32.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-s390x.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-sh4.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-unicore32.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-x86.x86_64 2:2.0.0-1.el7.6 @epel qemu-system-xtensa.x86_64 2:2.0.0-1.el7.6 @epel qemu-user.x86_64 2:2.0.0-1.el7.6 @epel seabios.git.x86_64 1.11.0-40.27.gd9a8b86 @qemu-firmware-jenkins I have installed the Virtualization Host group. Configured the nvram in the /etc/libvirt/qemu.conf, I even used the same copy from a previous installation. nvram = [ "/usr/share/OVMF/OVMF_CODE.secboot.fd:/usr/share/OVMF/OVMF_VARS.fd", "/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd:/usr/share/edk2.git/ovmf-x64/OVMF_VARS-pure-efi.fd" ] Thank you Aaron