other: 0.162 semantic: 0.158 device: 0.140 graphic: 0.123 KVM: 0.055 network: 0.049 performance: 0.043 debug: 0.043 vnc: 0.041 files: 0.039 boot: 0.038 permissions: 0.037 PID: 0.037 socket: 0.035 KVM: 0.754 debug: 0.068 PID: 0.038 files: 0.029 other: 0.026 boot: 0.022 socket: 0.016 network: 0.011 performance: 0.009 semantic: 0.008 device: 0.007 vnc: 0.005 graphic: 0.004 permissions: 0.003 kvm does not support KVM_CAP_USER_MEMORY Please upgrade to at least kernel 2.6.29 or recent kvm-kmod (see http://sourceforge.net/projects/kvm) We have a machine which is having QEMU+KVM on below configuration of linux uname -a Linux cairotrior 2.6.18-308.13.1.el5 #1 SMP Thu Jul 26 05:45:09 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux cat /etc/issue Red Hat Enterprise Linux Server release 5.8 (Tikanga) Kernel \r on an \m But in another setup, we are trying on a different machine having RHEL 5.9 having higher kernel version but it still gives below error kvm does not support KVM_CAP_USER_MEMORY Please upgrade to at least kernel 2.6.29 or recent kvm-kmod (see http://sourceforge.net/projects/kvm). failed to initialize KVM: Invalid argument No accelerator found! I don’t know if the qemu version have compatibility issues with redhat 5.9 version – need someone to check if the qemu can run on redhat 5.9 64 bit or not ? Triaging old bug tickets... can you still reproduce this issue with the latest version of QEMU? Or could we close this ticket nowadays? This error has never existed in QEMU, only in the old qemu-kvm fork which has been obsolete for about 5 years. I'm closing this ticket.