Bug the VM if something attempts to write-track a gfn, but write-tracking isn't enabled. The VM is doomed (and KVM has an egregious bug) if KVM or KVMGT wants to shadow guest page tables but can't because write-tracking isn't enabled. Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> --- arch/x86/kvm/mmu/page_track.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c index ffcd7ac66f9e..327e73be62d6 100644 --- a/arch/x86/kvm/mmu/page_track.c +++ b/arch/x86/kvm/mmu/page_track.c @@ -90,7 +90,7 @@ void kvm_write_track_add_gfn(struct kvm *kvm, struct kvm_memory_slot *slot, lockdep_assert_once(lockdep_is_held(&kvm->slots_lock) || srcu_read_lock_held(&kvm->srcu)); - if (WARN_ON(!kvm_page_track_write_tracking_enabled(kvm))) + if (KVM_BUG_ON(!kvm_page_track_write_tracking_enabled(kvm), kvm)) return; update_gfn_write_track(slot, gfn, 1); @@ -122,7 +122,7 @@ void kvm_write_track_remove_gfn(struct kvm *kvm, lockdep_assert_once(lockdep_is_held(&kvm->slots_lock) || srcu_read_lock_held(&kvm->srcu)); - if (WARN_ON(!kvm_page_track_write_tracking_enabled(kvm))) + if (KVM_BUG_ON(!kvm_page_track_write_tracking_enabled(kvm), kvm)) return; update_gfn_write_track(slot, gfn, -1); -- 2.40.0.rc1.284.g88254d51c5-goog
