powerpc: Turn off CPU_FTR_P9_TM_HV_ASSIST in non-hypervisor mode
authorPaul Mackerras <paulus@ozlabs.org>
Mon, 8 Oct 2018 05:30:47 +0000 (16:30 +1100)
committerMichael Ellerman <mpe@ellerman.id.au>
Tue, 9 Oct 2018 05:04:27 +0000 (16:04 +1100)
commite7b17d50471a8bfddf7c976c7d3a68104272b2f3
treeb0b26384452a379d91c333f29751abc7f23ecd18
parenta3ac077b75c5a922dcbafd7e689ee09beefae0f6
powerpc: Turn off CPU_FTR_P9_TM_HV_ASSIST in non-hypervisor mode

When doing nested virtualization, it is only necessary to do the
transactional memory hypervisor assist at level 0, that is, when
we are in hypervisor mode.  Nested hypervisors can just use the TM
facilities as architected.  Therefore we should clear the
CPU_FTR_P9_TM_HV_ASSIST bit when we are not in hypervisor mode,
along with the CPU_FTR_HVMODE bit.

Doing this will not change anything at this stage because the only
code that tests CPU_FTR_P9_TM_HV_ASSIST is in HV KVM, which currently
can only be used when when CPU_FTR_HVMODE is set.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/kernel/cpu_setup_power.S