On 01/07/19 16:53, Ricardo Neri wrote: >> >> (*) before the x86 people jump at me, this won't happen unless you >> explicitly pass an option to QEMU, such as "-cpu host,+umip". :) The >> incorrect emulation of SMSW when CR4.UMIP=1 is why. > Paolo, what do you mean by the incorrect emulation of SMSW?
When KVM tries to emulate UMIP on a system that doesn't have it, SMSW won't cause a #GP. The processor is simply not able to trap to the hypervisor on SMSW (unlike SGDT/SIDT/SLDT/STR), so it's impossible to do better. Paolo
