Hello, We're facing an issue with a Windows guest VM which runs quite well on a laptop (Fedora 25 - Core I7 4720HQ - https://www.asus.com/Notebooks/N551JX/specifications/ ) but not on 2 different servers (one Debian 8 on https://documentation.online.net/en/dedicated-server/offers/2015/server-dedibox-pro-2015-gen2#server_dedibox_pro_2015_gen2 - and one Fedora 25 on https://documentation.online.net/en/dedicated-server/offers/2016/server-dedibox-md-2016#server_dedibox_md_2016) with the same symptom : Windows get stuck with CPU at 100% (from services.exe process) a few "minute" after desktop is shown. Detailed informations (record / strace / qemu command / packages versions...) available here : https://gist.github.com/jbguerraz/faef292b48b2d0106d8d96ba0ddd943c Record tool shows a loop on such pattern (more on the linked gist) : qemu-system-x86 7420 [000] 28829.151596: kvm:kvm_exit: reason EPT_MISCONFIG rip 0xfffff80001df7eea info 0 0 qemu-system-x86 7420 [000] 28829.151596: kvm:kvm_emulate_insn: 0:fffff80001df7eea: 44 8b 80 f0 00 00 00 qemu-system-x86 7420 [000] 28829.151597: kvm:vcpu_match_mmio: gva 0xffffffffffd090f0 gpa 0xfed000f0 Read GPA qemu-system-x86 7420 [000] 28829.151597: kvm:kvm_mmio: mmio unsatisfied-read len 4 gpa 0xfed000f0 val 0x0 qemu-system-x86 7420 [000] 28829.151597: kvm:kvm_userspace_exit: reason KVM_EXIT_MMIO (6) qemu-system-x86 7420 [000] 28829.151598: kvm:kvm_fpu: unload qemu-system-x86 7420 [000] 28829.151599: kvm:kvm_mmio: mmio read len 4 gpa 0xfed000f0 val 0x5e3c5955 qemu-system-x86 7420 [000] 28829.151600: kvm:kvm_fpu: load qemu-system-x86 7420 [000] 28829.151600: kvm:kvm_entry: vcpu 0 qemu-system-x86 7420 [000] 28829.151607: kvm:kvm_exit: reason EPT_MISCONFIG rip 0xfffff80001df7eea info 0 0 qemu-system-x86 7420 [000] 28829.151608: kvm:kvm_emulate_insn: 0:fffff80001df7eea: 44 8b 80 f0 00 00 00 qemu-system-x86 7420 [000] 28829.151609: kvm:vcpu_match_mmio: gva 0xffffffffffd090f0 gpa 0xfed000f0 Read GPA qemu-system-x86 7420 [000] 28829.151609: kvm:kvm_mmio: mmio unsatisfied-read len 4 gpa 0xfed000f0 val 0x0 qemu-system-x86 7420 [000] 28829.151609: kvm:kvm_userspace_exit: reason KVM_EXIT_MMIO (6) qemu-system-x86 7420 [000] 28829.151610: kvm:kvm_fpu: unload qemu-system-x86 7420 [000] 28829.151611: kvm:kvm_mmio: mmio read len 4 gpa 0xfed000f0 val 0x5e3c5e0d qemu-system-x86 7420 [000] 28829.151612: kvm:kvm_fpu: load qemu-system-x86 7420 [000] 28829.151612: kvm:kvm_entry: vcpu 0 qemu-system-x86 7420 [000] 28829.151615: kvm:kvm_exit: reason EPT_MISCONFIG rip 0xfffff80001df7eea info 0 0 qemu-system-x86 7420 [000] 28829.151616: kvm:kvm_emulate_insn: 0:fffff80001df7eea: 44 8b 80 f0 00 00 00 qemu-system-x86 7420 [000] 28829.151616: kvm:vcpu_match_mmio: gva 0xffffffffffd090f0 gpa 0xfed000f0 Read GPA qemu-system-x86 7420 [000] 28829.151617: kvm:kvm_mmio: mmio unsatisfied-read len 4 gpa 0xfed000f0 val 0x0 qemu-system-x86 7420 [000] 28829.151617: kvm:kvm_userspace_exit: reason KVM_EXIT_MMIO (6) qemu-system-x86 7420 [000] 28829.151617: kvm:kvm_fpu: unload qemu-system-x86 7420 [000] 28829.151618: kvm:kvm_mmio: mmio read len 4 gpa 0xfed000f0 val 0x5e3c60f5 qemu-system-x86 7420 [000] 28829.151619: kvm:kvm_fpu: load qemu-system-x86 7420 [000] 28829.151619: kvm:kvm_entry: vcpu 0 If one of you have an idea about how to dig further, that would be super :) Thank you! Jean-Baptiste
