On 10/11/24 04:10, Sean Christopherson wrote:
This is effectively an extensive of the kvm_follow_pfn series[*] (and applies on top of said series), but is x86-specific and is *almost* entirely related to Accessed and Dirty bits. There's no central theme beyond cleaning up things that were discovered when digging deep for the kvm_follow_pfn overhaul, and to a lesser extent the series to add MGLRU support in KVM x86.
Very nice - looks obvious in retrospect, as it often happens. Paolo
[*] https://lore.kernel.org/all/20241010182427.1434605-1-seanjc@xxxxxxxxxx Sean Christopherson (18): KVM: x86/mmu: Flush remote TLBs iff MMU-writable flag is cleared from RO SPTE KVM: x86/mmu: Always set SPTE's dirty bit if it's created as writable KVM: x86/mmu: Fold all of make_spte()'s writable handling into one if-else KVM: x86/mmu: Don't force flush if SPTE update clears Accessed bit KVM: x86/mmu: Don't flush TLBs when clearing Dirty bit in shadow MMU KVM: x86/mmu: Drop ignored return value from kvm_tdp_mmu_clear_dirty_slot() KVM: x86/mmu: Fold mmu_spte_update_no_track() into mmu_spte_update() KVM: x86/mmu: WARN and flush if resolving a TDP MMU fault clears MMU-writable KVM: x86/mmu: Add a dedicated flag to track if A/D bits are globally enabled KVM: x86/mmu: Set shadow_accessed_mask for EPT even if A/D bits disabled KVM: x86/mmu: Set shadow_dirty_mask for EPT even if A/D bits disabled KVM: x86/mmu: Use Accessed bit even when _hardware_ A/D bits are disabled KVM: x86/mmu: Process only valid TDP MMU roots when aging a gfn range KVM: x86/mmu: Stop processing TDP MMU roots for test_age if young SPTE found KVM: x86/mmu: Dedup logic for detecting TLB flushes on leaf SPTE changes KVM: x86/mmu: Set Dirty bit for new SPTEs, even if _hardware_ A/D bits are disabled KVM: Allow arch code to elide TLB flushes when aging a young page KVM: x86: Don't emit TLB flushes when aging SPTEs for mmu_notifiers arch/x86/kvm/Kconfig | 1 + arch/x86/kvm/mmu/mmu.c | 72 +++++++----------------- arch/x86/kvm/mmu/spte.c | 59 ++++++++------------ arch/x86/kvm/mmu/spte.h | 72 ++++++++++++------------ arch/x86/kvm/mmu/tdp_mmu.c | 109 +++++++++++++++++-------------------- arch/x86/kvm/mmu/tdp_mmu.h | 2 +- virt/kvm/Kconfig | 4 ++ virt/kvm/kvm_main.c | 20 ++----- 8 files changed, 142 insertions(+), 197 deletions(-) base-commit: 3f9cf3d569fdf7fb451294b636991291965573ce
