x86/MCE/AMD: Cache SMCA MISC block addresses
... into a global, two-dimensional array and service subsequent reads from
that cache to avoid rdmsr_on_cpu() calls during CPU hotplug (IPIs with IRQs
disabled).
In addition, this fixes a KASAN slab-out-of-bounds read due to wrong usage
of the bank->blocks pointer.
Fixes: 27bd59502702 ("x86/mce/AMD: Get address from already initialized block")
Reported-by: Johannes Hirte <johannes.hirte at datenkhaos.de>
Tested-by: Johannes Hirte <johannes.hirte at datenkhaos.de>
Signed-off-by: Borislav Petkov <bp at suse.de>
Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Cc: Yazen Ghannam <yazen.ghannam at amd.com>
Link: http://lkml.kernel.org/r/20180414004230.GA2033@probook
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