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| author | Sean Christopherson <[email protected]> | 2021-02-25 12:47:27 -0800 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2021-03-15 04:43:34 -0400 |
| commit | 64bb2769d700f56dbb2f95705bb0732acddd00bf (patch) | |
| tree | 134902ac1d8d523172398fbbba43dc88f35e40b9 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 203219571330a591bc60b84ab052dbe0ccc52827 (diff) | |
KVM: x86/mmu: Check for shadow-present SPTE before querying A/D status
When updating accessed and dirty bits, check that the new SPTE is present
before attempting to query its A/D bits. Failure to confirm the SPTE is
present can theoretically cause a false negative, e.g. if a MMIO SPTE
replaces a "real" SPTE and somehow the PFNs magically match.
Realistically, this is all but guaranteed to be a benign bug. Fix it up
primarily so that a future patch can tweak the MMU_WARN_ON checking A/D
status to fire if the SPTE is not-present.
Fixes: f8e144971c68 ("kvm: x86/mmu: Add access tracking for tdp_mmu")
Cc: Ben Gardon <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions