From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3qT22m4lCvzDq7K for ; Mon, 21 Mar 2016 14:52:16 +1100 (AEDT) From: David Gibson To: paulus@samba.org, aik@ozlabs.ru, benh@kernel.crashing.org Cc: bharata@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, michael@ellerman.id.au, David Gibson Subject: [RFCv3 00/17] PAPR HPT resizing, guest & host side Date: Mon, 21 Mar 2016 14:53:07 +1100 Message-Id: <1458532404-21258-1-git-send-email-david@gibson.dropbear.id.au> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This is an 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 a draft host side implementation for KVM HV (the KVM PR and TCG host-side implementations live in qemu). This works, but is very slow in the critical section (where the guest must be stopped). It is significantly slower than the TCG/PR implementation; unusably slow for large hash tables (~2.8s for a 1G HPT). I'm still looking into what's the cause of the slowness, and I'm not sure yet if the current approach can be tweaked to be fast enough, or if it will require a new approach. Changes since RFCv2: * Completely new approach to handling KVM HV implementation. Much simpler synchronization requirements, but also slower * Rebase to latest Linus' tree * Changed number for capability, so as not to collide * Host side now actually works David Gibson (17): 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: Create kvmppc_unmap_hpte_helper() powerpc/kvm: KVM-HV HPT resizing stub implementation powerpc/kvm: Outline of KVM-HV HPT resizing implementation powerpc/kvm: KVM-HV HPT resizing, preparation path powerpc/kvm: HVM-HV HPT resizing, commit path powerpc/kvm: Advertise availablity of HPT resizing on KVM HV arch/powerpc/include/asm/firmware.h | 5 +- arch/powerpc/include/asm/hvcall.h | 2 + arch/powerpc/include/asm/kvm_book3s.h | 12 +- arch/powerpc/include/asm/kvm_book3s_64.h | 15 + arch/powerpc/include/asm/kvm_host.h | 17 +- arch/powerpc/include/asm/kvm_ppc.h | 11 +- arch/powerpc/include/asm/machdep.h | 1 + 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 | 626 ++++++++++++++++++++++++------ arch/powerpc/kvm/book3s_hv.c | 37 +- arch/powerpc/kvm/book3s_hv_builtin.c | 8 +- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 68 ++-- arch/powerpc/kvm/powerpc.c | 17 +- arch/powerpc/mm/hash_utils_64.c | 57 +++ arch/powerpc/mm/mem.c | 4 + arch/powerpc/platforms/pseries/firmware.c | 1 + arch/powerpc/platforms/pseries/lpar.c | 110 ++++++ include/uapi/linux/kvm.h | 1 + 21 files changed, 825 insertions(+), 183 deletions(-) -- 2.5.0