From: Gavin Shan gshan@redhat.com
commit cf2d23e0bac9f6b5cd1cba8898f5f05ead40e530 upstream.
kvm_test_age_hva() is called upon mmu_notifier_test_young(), but wrong address range has been passed to handle_hva_to_gpa(). With the wrong address range, no young bits will be checked in handle_hva_to_gpa(). It means zero is always returned from mmu_notifier_test_young().
This fixes the issue by passing correct address range to the underly function handle_hva_to_gpa(), so that the hardware young (access) bit will be visited.
Fixes: 35307b9a5f7e ("arm/arm64: KVM: Implement Stage-2 page aging") Signed-off-by: Gavin Shan gshan@redhat.com Signed-off-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20200121055659.19560-1-gshan@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- virt/kvm/arm/mmu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -2147,7 +2147,8 @@ int kvm_test_age_hva(struct kvm *kvm, un if (!kvm->arch.pgd) return 0; trace_kvm_test_age_hva(hva); - return handle_hva_to_gpa(kvm, hva, hva, kvm_test_age_hva_handler, NULL); + return handle_hva_to_gpa(kvm, hva, hva + PAGE_SIZE, + kvm_test_age_hva_handler, NULL); }
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu)