Here's various patches for radix, a few small bugfixes, tracepoint
enablement or partition scope tlbie, and some page fault optimisation.
This was tested with the patch to qemu that enables THP for partition
scope page tables and things seem to work as expected.
Changes since v1:
- Feedback from Paul
- Improved changelog in the page table umap patch (patch 4).
- Changed and commented patch 4 to not expect ptes to be unmapped
in the page fault path, because they should already be invalidated.
Only unmap and free page tables. This has checks and warnings and
some recovery code in case ptes are encountered. This is expensive
compared to the page table unmap, but in my measurements this path
is pretty rare so I leave it in unconditionally for now to help
flush out bugs. We can rip it out or put it under a CONFIG easily
it's just a few lines.
- Fixed PWC flushing with recursive page table freeing (previous code
would free child page tables before the parent was cleared ad PWC
flushed, so the MMU may still have been able to reference them).
- That fix to patch 4 required patch 5 as well, so those are squashed
together. The nature of the code made it pointless to put patch 5
first.
- Survived some basic stress testing overnight.
Thanks,
Nick
Nicholas Piggin (9):
KVM: PPC: Book3S HV: radix use correct tlbie sequence in
kvmppc_radix_tlbie_page
KVM: PPC: Book3S HV: radix clear pte when unmapping
KVM: PPC: Book3S HV: use a helper to unmap ptes in the radix fault
path
KVM: PPC: Book3S HV: recursively unmap all page table entries when
unmapping
powerpc/mm/radix: implement LPID based TLB flushes to be used by KVM
KVM: PPC: Book3S HV: radix use the Linux translation flush functions
for partition scope
KVM: PPC: Book3S HV: radix handle process scoped LPID flush in C, with
relocation on
KVM: PPC: Book3S HV: radix refine IO region partition scope attributes
KVM: PPC: Book3S HV: radix do not clear partition pte when RC or write
bits do not match
.../include/asm/book3s/64/tlbflush-radix.h | 7 +
arch/powerpc/kvm/book3s_64_mmu_radix.c | 349 +++++++++++-------
arch/powerpc/kvm/book3s_hv.c | 26 ++
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 13 +-
arch/powerpc/mm/tlb-radix.c | 207 +++++++++++
5 files changed, 467 insertions(+), 135 deletions(-)
--
2.17.0
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