While attempting to understand the big comment in
kvm_mmu_slot_remove_write_access() about TLB flushing, I discovered a
bug in the way the TDP MMU write-protects GFNs. I have not managed to
reproduce the bug as it requires a rather complex set up of live
migrating a VM that is using nested virtualization while the TDP MMU is
enabled.
Patch 1 fixes the bug and patch 2 fixes up the afformentioned comment to
be more readable.
Tested using the kvm-unit-tests and KVM selftests.
David Matlack (2):
KVM: x86/mmu: Fix write-protection of PTs mapped by the TDP MMU
KVM: x86/mmu: Improve comment about TLB flush semantics for
write-protection
arch/x86/kvm/mmu/mmu.c | 29 ++++++++++++++++++++---------
arch/x86/kvm/mmu/tdp_mmu.c | 27 ++++++++++++++++++++-------
2 files changed, 40 insertions(+), 16 deletions(-)
base-commit: fea31d1690945e6dd6c3e89ec5591490857bc3d4
--
2.34.1.703.g22d0c6ccf7-goog
