On 04/05/2017 11:37, Wanpeng Li wrote: > > The kvm-unit-tests/vmx.flat fails against instruction(mwait) intercept test. > > Test suite: instruction intercept > Unhandled exception 13 #GP at ip 0000000000402397 > error_code=0000 rflags=00010012 cs=00000008 > rax=0000000000000000 rcx=0000000004006172 rdx=0000000000402397 rbx=000000000041427d > rbp=0000000007ff8fdf rsi=0000000000000000 rdi=0000000000000004 > r8=000000000000000a r9=00000000000003f8 r10=0000000000000000 r11=0000000000000000 > r12=0000000000000000 r13=0000000000000000 r14=0000000000000000 r15=0000000000000000 > cr0=0000000080010031 cr2=0000000000000000 cr3=0000000007fff000 cr4=0000000000002020 > cr8=0000000000000000 > STACK: @402397 401102 400459 The problem is simply that the tests were not clearing eax/ecx/edx. Update kvm-unit-tests.git, it includes the "[PATCH] vmx: correctly set up MONITOR and MWAIT" from April 27 (message id 1493309532-14398-1-git-send-email-pbonzini@xxxxxxxxxx). Thanks, Paolo