Documentation/powerpc/dawr-power9.rst

2 DAWR issues on POWER9
5 On POWER9 the Data Address Watchpoint Register (DAWR) can cause a checkstop
7 disinguish CI memory when configuring the DAWR, so (for now) the DAWR is
13     powerpc: Disable DAWR in the base POWER9 CPU features
18 DAWR has 6 different ways of being set.
20 2) h_set_mode(DAWR)
29 h_set_mode(DAWR) and h_set_dabr() will now return an error to the
31 they will silently not get the DAWR.
36 DAWR on the migration.
53 and configure the hardware to use the DAWR. This will run at full
60 Force enabling the DAWR
62 Kernels (since ~v5.2) have an option to force enable the DAWR via::
66 This enables the DAWR even on POWER9.
71 (ie. single user/desktop systems) and really want the DAWR.  This
72 allows them to force enable DAWR.
74 This flag can also be used to disable DAWR access. Once this is
75 cleared, all DAWR access should be cleared immediately and your
78 Userspace may get confused by toggling this. If DAWR is force
83 For the DAWR to be enabled in a KVM guest, the DAWR needs to be force
87 writing the DAWR.
89 To double check the DAWR is working, run this kernel selftest: