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@google.com
>
> 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