Hi, Sean and all. Thanks so much for these. Very glad to report that the problem has been solved. I applied all four patches, recompiled kernel 5.10.1 and successfully launched a Qemu VM. Let's hope these will get merged into 5.10.2. Thanks again for the hard work and quick fix. Richard Herbert On Thursday, December 17, 2020 7:31:35 PM EST Sean Christopherson wrote: > Two fixes for bugs that were introduced along with the TDP MMU (though I > strongly suspect only the one reported by Richard, fixed in patch 2/4, is > hittable in practice). Two additional cleanup on top to try and make the > code a bit more readable and shave a few cycles. > > Sean Christopherson (4): > KVM: x86/mmu: Use -1 to flag an undefined spte in get_mmio_spte() > KVM: x86/mmu: Get root level from walkers when retrieving MMIO SPTE > KVM: x86/mmu: Use raw level to index into MMIO walks' sptes array > KVM: x86/mmu: Optimize not-present/MMIO SPTE check in get_mmio_spte() > > arch/x86/kvm/mmu/mmu.c | 53 +++++++++++++++++++++----------------- > arch/x86/kvm/mmu/tdp_mmu.c | 9 ++++--- > arch/x86/kvm/mmu/tdp_mmu.h | 4 ++- > 3 files changed, 39 insertions(+), 27 deletions(-)
