KVM: MMU: Report spte not found in rmap before BUG()

In the past we've had errors of single-bit in the other two cases; the
printk() may confirm it for the third case (many->many).

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 89a49fb..4f499d7 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -662,6 +662,7 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
                        prev_desc = desc;
                        desc = desc->more;
                }
+               pr_err("rmap_remove: %p %llx many->many\n", spte, *spte);
                BUG();
        }
 }