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powerpc: Drop OPAL_HANDLE_HMI2 for now, to avoid panicking

Description

powerpc: Drop OPAL_HANDLE_HMI2 for now, to avoid panicking

It's possible for a Hypervisor Maintenance Interrupt (HMI) to occur while in
the pmap code, holding locks. This can cause WITNESS to panic due to lock
errors in calling pmap_kextract(). Since we don't yet handle the flags
returned by OPAL_HANDLE_HMI2, just stop using it, so that we don't call into
pmap_kextract().

Reported by: pkubaj

Details

Provenance
jhibbitsAuthored on
Parents
rS347012: MFC r346712:
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