The Linux Test Robot found a few RCU warnings in the TDP MMU:
https://www.spinics.net/lists/kernel/msg3845500.html
https://www.spinics.net/lists/kernel/msg3845521.html
Fix these warnings and cleanup a hack in tdp_mmu_iter_cond_resched.
Tested by compiling as suggested in the test robot report and confirmed
that the warnings go away with this series applied. Also ran
kvm-unit-tests on an Intel Skylake machine with the TDP MMU enabled and
confirmed that the series introduced no new failures.
Ben Gardon (3):
KVM: x86/mmu: Fix RCU usage in handle_removed_tdp_mmu_page
KVM: x86/mmu: Fix RCU usage when atomically zapping SPTEs
KVM: x86/mmu: Factor out tdp_iter_return_to_root
Sean Christopherson (1):
KVM: x86/mmu: Store the address space ID in the TDP iterator
arch/x86/kvm/mmu/mmu_internal.h | 5 +++++
arch/x86/kvm/mmu/tdp_iter.c | 30 +++++++++++++++----------
arch/x86/kvm/mmu/tdp_iter.h | 4 +++-
arch/x86/kvm/mmu/tdp_mmu.c | 40 +++++++++++++--------------------
4 files changed, 41 insertions(+), 38 deletions(-)