This is an incomplete implementation of the kernel parts of the PAPR hashed page table (HPT) resizing extension.
It contains a complete guest-side implementation - or as complete as it can be until we have a final PAPR change. It also contains preliminary patches towards a host side implementation for KVM HV (the KVM PR and TCG host-side implementations live in qemu). This isn't working yet, but has an outline of the approach. I'm hoping particularly for comment on the locking / synchronization between the resizing work thread and the hypercalls in patch 18/18. This is much hairier than I'd like, in order to handle the various failure / cancellation paths, but as yet I haven't seen a simpler way of accomplishing what we need. David Gibson (18): powerpc/mm: Clean up error handling for htab_remove_mapping powerpc/mm: Handle removing maybe-present bolted HPTEs powerpc/mm: Clean up memory hotplug failure paths powerpc/mm: Split hash page table sizing heuristic into a helper pseries: Add hypercall wrappers for hash page table resizing pseries: Add support for hash table resizing pseries: Advertise HPT resizing support via CAS pseries: Automatically resize HPT for memory hot add/remove powerpc/kvm: Corectly report KVM_CAP_PPC_ALLOC_HTAB powerpc/kvm: Add capability flag for hashed page table resizing powerpc/kvm: Rename kvm_alloc_hpt() for clarity powerpc/kvm: Gather HPT related variables into sub-structure powerpc/kvm: Don't store values derivable from HPT order powerpc/kvm: Split HPT allocation from activation powerpc/kvm: Allow KVM_PPC_ALLOCATE_HTAB ioctl() to change HPT size powerpc/kvm: HPT resizing stub implementation powerpc/kvm: Advertise availablity of HPT resizing on KVM HV powerpc/kvm: Outline of HPT resizing implementation arch/powerpc/include/asm/firmware.h | 5 +- arch/powerpc/include/asm/hvcall.h | 2 + arch/powerpc/include/asm/kvm_book3s.h | 6 + arch/powerpc/include/asm/kvm_book3s_64.h | 15 + arch/powerpc/include/asm/kvm_host.h | 18 +- arch/powerpc/include/asm/kvm_ppc.h | 11 +- arch/powerpc/include/asm/machdep.h | 3 +- arch/powerpc/include/asm/mmu-hash64.h | 3 + arch/powerpc/include/asm/plpar_wrappers.h | 12 + arch/powerpc/include/asm/prom.h | 1 + arch/powerpc/include/asm/sparsemem.h | 1 + arch/powerpc/kernel/prom_init.c | 2 +- arch/powerpc/kvm/book3s_64_mmu_hv.c | 452 ++++++++++++++++++++++++------ arch/powerpc/kvm/book3s_hv.c | 38 ++- arch/powerpc/kvm/book3s_hv_builtin.c | 8 +- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 62 ++-- arch/powerpc/kvm/powerpc.c | 17 +- arch/powerpc/mm/hash_utils_64.c | 128 +++++++-- arch/powerpc/mm/init_64.c | 47 ++-- arch/powerpc/mm/mem.c | 14 +- arch/powerpc/platforms/pseries/firmware.c | 1 + arch/powerpc/platforms/pseries/lpar.c | 119 +++++++- include/uapi/linux/kvm.h | 1 + 23 files changed, 774 insertions(+), 192 deletions(-) -- 2.5.0 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
