https://bugzilla.kernel.org/show_bug.cgi?id=200877 --- Comment #2 from Georgios Amanakis (g_amanakis@xxxxxxxxx) --- I reproduced this easily on two systems: Xeon E5 2667v2 / X9SRA running Fedora 28, with Windows 10 1803 as KVM guest Xeon E3 1270v2 / X9SCM running Archlinux, with Windows 10 1803 as KVM guest Both systems are up to date (4.17.19 or 4.18.3), and the performance degradation doesn't occur when Windows 10 1803 runs on bare metal. The performance degradation also doesn't occur when the Windows 10 guest disables spectre mitigation using "InSpectre.exe", or when the spec_ctrl flag is disabled in libvirt, or when the cpu-microcode isn't updated in the host. -- You are receiving this mail because: You are watching the assignee of the bug.
