Thank you Paolo ! FC25 - VM "OK" - Linux Kernel : 4.10.5-200.fc25.x86_64 FC25 - VM "Not OK" - Linux Kernel : 4.10.8-200.fc25.x86_64 I tried with "pml=0" and same result. Finally I decided (hopeless) to re-transfer the windows disk image from my laptop to the server and... it worked! :O I dunno if a couple of bits got corrupted somehow during initial transfer but, I feel so, it can't be a random luck. Thank you again guys! I really appreciated the support! 2017-04-14 11:00 GMT+02:00 Paolo Bonzini <pbonzini@xxxxxxxxxx>: > > > On 14/04/2017 16:45, Jean Baptiste Guerraz wrote: >> Thank you Radim for the answer! >> >> There are indeed some differences between those systems in KVM modules >> parameters; I've updated the gist with all those details : >> https://gist.github.com/jbguerraz/faef292b48b2d0106d8d96ba0ddd943c >> >> With a focus on differences between the two FC25 systems, we get : >> - /sys/module/kvm_intel/parameters/enable_shadow_vmcs is set to Y on >> the not working one >> - /sys/module/kvm_intel/parameters/pml is set to Y on the not working one > > So one is Ivy Bridge and one is Broadwell I think. That's good to know > because both have the same interrupt injection path. > > What version of the kernel is this? Does loading kvm_intel with pml=0 > fix it? (Shadow VMCS is not an issue because it's only used for nested > virtualization). > > Paolo
