K 10
svn:author
V 8
jhibbits
K 8
svn:date
V 27
2020-05-21T03:33:20.606959Z
K 7
svn:log
V 444
powerpc: Handle machine checks caused by D-ERAT multihit

Instead of crashing the user process when a D-ERAT multihit is detected, try
to flush the ERAT, and continue.  This machine check indicates a likely PMAP
invalidation shortcoming that will need to be addressed, but it's
recoverable, so just recover.  The recovery is pmap-specific to flush the
ERAT, so add a pmap function to do so, currently only implemented by the
POWER9 radix pmap.

END