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H A Dspapr_hcall.caf08a58f Thu Feb 11 06:47:19 CST 2016 Thomas Huth <thuth@redhat.com> hw/ppc/spapr: Implement h_set_dabr

According to LoPAPR, h_set_dabr should simply set DABRX to 3
(if the register is available), and load the parameter into DABR.
If DABRX is not available, the hypervisor has to check the
"Breakpoint Translation" bit of the DABR register first.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>