On 2011-10-18 15:13, Avi Kivity wrote: > On 10/18/2011 03:07 PM, Jan Kiszka wrote: >>> >>> It's probably a bug in kvm. Try collecting a complete trace as in >>> http://www.linux-kvm.org/page/Tracing and posting it here, maybe >>> something will jump out. >>> >>> Also try out -no-kvm. >> >> A shot from the hips: Jörg and I are just hunting down 16 bit task >> switch issues on AMD hosts. If this problem may be related can be >> checked by loading kvm-amd with npt=0, ie. disabling nested paging. > > Do you mean that you suspect that kvm's task switch emulation is more > accurate than the hardware? Gleb will have a heart attack. As it looks like (for AMD). But the last proof is yet missing - /me is instrumenting right now. > Another area to look at is A20 emulation, based on where the hang occurs. Yeah, maybe. Traces may tell. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
