(2011/10/28 21:48), Jun Koi wrote:
2011/10/28 Kenji Kaneshigekaneshige.kenji@jp.fujitsu.com:
Avi, Jan,
Could you comment on these patches?
Inject-NMI doesn't work on Windows guest without these patches.
sorry but i am really curious here: why Windows still works well even if it desnt see the inject-NMI? or there are still invisible side-effects that we are not awere of???
Without this patch, LVT LINT1 is not configured by Windows guest because seabios MADT has no ACPI NMI structure which is used by Windows to setup LVT. So NMI interrupt would not be sent to CPUs when NMI signal happens on LINT1. But qemu/kvm inject-nmi feature had a bug that it sent NMI to CPUs without emulating LAPIC LVT. As a result, NMI interrupt is sent to all the CPUs even though LVT LINT1 is not configured. This is why inject-nmi behaves as if it works well on Windows guest.
Regards, Kenji Kaneshige