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6 if it points to cache inhibited (CI) memory. Currently Linux has no way to
26 PPC_PTRACE_GETHWDBGINFO call. This results in GDB falling back to
29 h_set_mode(DAWR) and h_set_dabr() will now return an error to the
35 migration from POWER8 to POWER9, at the cost of silently losing the
49 host. The watchpoint will fail and GDB will fall back to software
53 and configure the hardware to use the DAWR. This will run at full
55 guest is migrated to a POWER9 host, the watchpoint will be lost on the
56 POWER9. Loads and stores to the watchpoint locations will not be
58 migrated back to the POWER8 host, it will start working again.
62 Kernels (since ~v5.2) have an option to force enable the DAWR via::
72 allows them to force enable DAWR.
74 This flag can also be used to disable DAWR access. Once this is
83 For the DAWR to be enabled in a KVM guest, the DAWR needs to be force
85 POWERVM as it doesn't allow the HCALL to work. Writes of 'Y' to the
89 To double check the DAWR is working, run this kernel selftest:
91   tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c