Re: [PATCH 00/18] KVM: x86/mmu: A/D cleanups (on top of kvm_follow_pfn)

Sean Christopherson
2024-10-31T19:56:18Z

On Thu, 10 Oct 2024 19:10:32 -0700, 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.
>
> [...]

Applied to kvm-x86 mmu, with Paolo's suggestions (the guard(rcu) trick in
particular was quite nice).

[01/18] KVM: x86/mmu: Flush remote TLBs iff MMU-writable flag is cleared from RO SPTE
https://github.com/kvm-x86/linux/commit/081976992f43
[02/18] KVM: x86/mmu: Always set SPTE's dirty bit if it's created as writable
https://github.com/kvm-x86/linux/commit/cc7ed3358e41
[03/18] KVM: x86/mmu: Fold all of make_spte()'s writable handling into one if-else
https://github.com/kvm-x86/linux/commit/0387d79e24d6
[04/18] KVM: x86/mmu: Don't force flush if SPTE update clears Accessed bit
https://github.com/kvm-x86/linux/commit/b7ed46b201a4
[05/18] KVM: x86/mmu: Don't flush TLBs when clearing Dirty bit in shadow MMU
https://github.com/kvm-x86/linux/commit/856cf4a60cff
[06/18] KVM: x86/mmu: Drop ignored return value from kvm_tdp_mmu_clear_dirty_slot()
https://github.com/kvm-x86/linux/commit/010344122dca
[07/18] KVM: x86/mmu: Fold mmu_spte_update_no_track() into mmu_spte_update()
https://github.com/kvm-x86/linux/commit/67c93802928b
[08/18] KVM: x86/mmu: WARN and flush if resolving a TDP MMU fault clears MMU-writable
https://github.com/kvm-x86/linux/commit/1a175082b190
[09/18] KVM: x86/mmu: Add a dedicated flag to track if A/D bits are globally enabled
https://github.com/kvm-x86/linux/commit/a5da5dde4ba4
[10/18] KVM: x86/mmu: Set shadow_accessed_mask for EPT even if A/D bits disabled
https://github.com/kvm-x86/linux/commit/3835819fb1b3
[11/18] KVM: x86/mmu: Set shadow_dirty_mask for EPT even if A/D bits disabled
https://github.com/kvm-x86/linux/commit/53510b912518
[12/18] KVM: x86/mmu: Use Accessed bit even when _hardware_ A/D bits are disabled
https://github.com/kvm-x86/linux/commit/7971801b5618
[13/18] KVM: x86/mmu: Process only valid TDP MMU roots when aging a gfn range
https://github.com/kvm-x86/linux/commit/526e609f0567
[14/18] KVM: x86/mmu: Stop processing TDP MMU roots for test_age if young SPTE found
https://github.com/kvm-x86/linux/commit/51192ebdd145
[15/18] KVM: x86/mmu: Dedup logic for detecting TLB flushes on leaf SPTE changes
https://github.com/kvm-x86/linux/commit/c9b625625ba3
[16/18] KVM: x86/mmu: Set Dirty bit for new SPTEs, even if _hardware_ A/D bits are disabled
https://github.com/kvm-x86/linux/commit/85649117511d
[17/18] KVM: Allow arch code to elide TLB flushes when aging a young page
https://github.com/kvm-x86/linux/commit/2ebbe0308c29
[18/18] KVM: x86: Don't emit TLB flushes when aging SPTEs for mmu_notifiers
https://github.com/kvm-x86/linux/commit/b9883ee40d7e

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