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    SubjectRe: [PATCH mm-unstable v1 2/5] kvm/x86: add kvm_arch_test_clear_young()
    On Thu, Feb 16, 2023 at 9:12 PM Yu Zhao <yuzhao@google.com> wrote:
    >
    > This patch adds kvm_arch_test_clear_young() for the vast majority of
    > VMs that are not nested and run on hardware that sets the accessed bit
    > in TDP MMU page tables.
    >
    > It relies on two techniques, RCU and cmpxchg, to safely test and clear
    > the accessed bit without taking the MMU lock. The former protects KVM
    > page tables from being freed while the latter clears the accessed bit
    > atomically against both the hardware and other software page table
    > walkers.
    >
    > Signed-off-by: Yu Zhao <yuzhao@google.com>
    > ---
    > arch/x86/include/asm/kvm_host.h | 27 ++++++++++++++++++++++
    > arch/x86/kvm/mmu/spte.h | 12 ----------
    > arch/x86/kvm/mmu/tdp_mmu.c | 41 +++++++++++++++++++++++++++++++++
    > 3 files changed, 68 insertions(+), 12 deletions(-)

    Adding Sean and David.

    Can you please add other interested parties that I've missed?

    Thanks.

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