Re: [PATCH 0/4] KVM: x86/mmu: Fix TDP MMU dirty logging bug L2 running with EPT disabled

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On Fri, 15 Mar 2024 16:05:37 -0700, David Matlack wrote:
> Fix a bug in the TDP MMU caught by syzkaller and CONFIG_KVM_PROVE_MMU
> that causes writes made by L2 to no be reflected in the dirty log when
> L1 has disabled EPT.
> Patch 1 contains the fix. Patch 2 and 3 fix comments related to clearing
> dirty bits in the TDP MMU. Patch 4 adds selftests coverage of dirty
> logging of L2 when L1 has disabled EPT. i.e.  a regression test for this
> bug.
> [...]

Applied to kvm-x86 fixes, with the various tweaks mentioned in reply, and the
s/READ_ONCE/WRITE_ONCE fixup.  A sanity check would be nice though, I botched
the first attempt at the fixup (the one time I _should_ have copy+pasted code...).


[1/4] KVM: x86/mmu: Check kvm_mmu_page_ad_need_write_protect() when clearing TDP MMU dirty bits
[2/4] KVM: x86/mmu: Remove function comments above clear_dirty_{gfn_range,pt_masked}()
[3/4] KVM: x86/mmu: Fix and clarify comments about clearing D-bit vs. write-protecting
[4/4] KVM: selftests: Add coverage of EPT-disabled to vmx_dirty_log_test


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