On Thu, Feb 16, 2023 at 9:12 PM Yu Zhao <yuzhao@xxxxxxxxxx> 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@xxxxxxxxxx> > --- > 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.
