Re: [PATCH v3 0/4] Fix RCU warnings in TDP MMU

[Paolo Bonzini]

On 16/03/21 00:37, Ben Gardon wrote:
> 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(-)

Queued, thanks.

Paolo