Hi list,
I'm trying to extend OProfile to support guest profiling. One step of
my work is to push an NMI to the guest(s) when a performance counter
overflows. Please correct me if the following is not correct:
counter overflow --> NMI to host --> VM exit --> "int $2" to handle
NMI on host --> ... --> VM entry --> NMI to guest
On the path between VM-exit and VM-entry, I want to push an NMI to the
guest. I tried to put the following code on the path, but never
succeeded. Various wired things happened, such as KVM hangs, guest
kernel oops, and host hangs. I tried both code with Linux 2.6.30 and
version 88.
if (vmx_nmi_allowed()) { vmx_inject_nmi(); }
Any suggestions? Where is the right place to push an NMI and what are
the necessary checks?
Thanks,
Jiaqing
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