On 02/04/21 01:37, Ben Gardon wrote:
Now that the TDP MMU is able to handle page faults in parallel, it's a relatively small change to expand to other operations. This series allows zapping a range of GFNs, reclaiming collapsible SPTEs (when disabling dirty logging), and enabling dirty logging to all happen under the MMU lock in read mode.This is partly a cleanup + rewrite of the last few patches of the parallel page faults series. I've incorporated feedback from Sean and Paolo, but the patches have changed so much that I'm sending this as a separate series. Ran kvm-unit-tests + selftests on an SMP kernel + Intel Skylake, with the TDP MMU enabled and disabled. This series introduces no new failures or warnings. I know this will conflict horribly with the patches from Sean's series which were just queued, and I'll send a v2 to fix those conflicts + address any feedback on this v1. Changelog v2: -- Rebased patches on top of kvm/queue to incorporate Sean's recent TLB flushing changes -- Dropped patch 5: "KVM: x86/mmu: comment for_each_tdp_mmu_root requires MMU write lock" as the following patch to protect the roots list with RCU adds lockdep which makes the comment somewhat redundant. Ben Gardon (13): KVM: x86/mmu: Re-add const qualifier in kvm_tdp_mmu_zap_collapsible_sptes KVM: x86/mmu: Move kvm_mmu_(get|put)_root to TDP MMU KVM: x86/mmu: use tdp_mmu_free_sp to free roots KVM: x86/mmu: Merge TDP MMU put and free root KVM: x86/mmu: Refactor yield safe root iterator KVM: x86/mmu: Make TDP MMU root refcount atomic KVM: x86/mmu: handle cmpxchg failure in kvm_tdp_mmu_get_root KVM: x86/mmu: Protect the tdp_mmu_roots list with RCU KVM: x86/mmu: Allow zap gfn range to operate under the mmu read lock KVM: x86/mmu: Allow zapping collapsible SPTEs to use MMU read lock KVM: x86/mmu: Allow enabling / disabling dirty logging under MMU read lock KVM: x86/mmu: Fast invalidation for TDP MMU KVM: x86/mmu: Tear down roots in fast invalidation thread arch/x86/include/asm/kvm_host.h | 21 +- arch/x86/kvm/mmu/mmu.c | 115 +++++++--- arch/x86/kvm/mmu/mmu_internal.h | 27 +-- arch/x86/kvm/mmu/tdp_mmu.c | 375 +++++++++++++++++++++++--------- arch/x86/kvm/mmu/tdp_mmu.h | 28 ++- include/linux/kvm_host.h | 2 +- 6 files changed, 407 insertions(+), 161 deletions(-)
Applied to kvm/mmu-notifier-queue, thanks. Paolo
