KVM: x86/mmu: Remove spurious clearing of dirty bit from TDP MMU SPTE

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Don't clear the dirty bit when aging a TDP MMU SPTE (in response to a MMU
notifier event).  Prematurely clearing the dirty bit could cause spurious
PML updates if aging a page happened to coincide with dirty logging.

Note, tdp_mmu_set_spte_no_acc_track() flows into __handle_changed_spte(),
so the host PFN will be marked dirty, i.e. there is no potential for data
corruption.

Fixes: a6a0b05da9 ("kvm: x86/mmu: Support dirty logging for the TDP MMU")
Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210331004942.2444916-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-03-30 17:49:41 -07:00 • committed by Paolo Bonzini

parent 6dfbd6b5d5

commit 6d9aafb96d

1 changed files with 0 additions and 1 deletions

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arch/x86/kvm/mmu/tdp_mmu.c

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