KVM TLB flushing improvements (for radix)

This series moves some of the radix mode TLB flushing into powerpc/mm, which allows them them to implement the powerpc:tlbie tracepoints for KVM invalidations.

This also fixes a partition scoped page fault performance issue that was found by looking at partition scoped tlbie traces.

Since v1:
- Fixed a bug where I mixed up PRS values, leading to guest page fault hangs.
- Fixed up the hash cases that still need to be done in real-mode.
- Dropped the hash changes including the interesting case of a hash tlbie issued by a radix host, for mixed mode support.

This has survived some stress testing over the weekend now, so it should be ready for wider review.

Thanks,
Nick

Nicholas Piggin (5):
KVM: PPC: Book3S HV: radix use correct tlbie sequence in
kvmppc_radix_tlbie_page
powerpc/mm/radix: implement LPID based TLB flushes to be used by KVM
KVM: PPC: Book3S HV: radix use the Linux TLB flush function in
kvmppc_radix_tlbie_page
KVM: PPC: Book3S HV: radix handle process scoped LPID flush in C, with
relocation on
KVM: PPC: Book3S HV: radix do not clear partition scoped page table
when page fault races with other vCPUs.

 .../include/asm/book3s/64/tlbflush-radix.h    |   6 +
 arch/powerpc/kvm/book3s_64_mmu_radix.c        |  78 ++++-----
 arch/powerpc/kvm/book3s_hv.c                  |  26 +++
 arch/powerpc/kvm/book3s_hv_rmhandlers.S       |  13 +-
 arch/powerpc/mm/tlb-radix.c                   | 160 ++++++++++++++++++
 5 files changed, 238 insertions(+), 45 deletions(-)

2.17.0