(context: sysrq-B with kvm-intel.ko loaded doesn't work. on my machine,
it kills the sata interface, but the processor and network keeps working)
So INIT (which is wired to the triple-fault processor output, it seems,
rather than RESET) is blocked and the machine is not reset completely.
So we need to disable vmx during native_machine_emergency_restart().
There are at least three ways of doing this:
- add a vmxoff sequence (with an exception handler) to
native_machine_emergency_restart(). while simplest, this will not
unblock INIT for other cpus
- add an emergency_restart notifier_block, and have kvm subscribe. This
has the disadvantage of being slightly complex, opening a tiny race
(emergency restart during kvm module initialization), and requiring IPIs
during emergency restart.
- move vmxon/vmxoff management out of the kvm module and into x86 core.
Bloats the core but reduces complexity. IPIs still required.
I think the notifier block is the way to go. Ingo, let me know what you
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