[PATCH] KVM: MMU: If an empty shadow page is not empty, report more info

Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index b9ba240144b7cb7dafa81b43cee3c513ef6eb076..8cf3688f7e708e1e7aee529f3deb7a39adb79e0f 100644 (file)
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -305,12 +305,16 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn)
 
 static int is_empty_shadow_page(hpa_t page_hpa)
 {
-       u32 *pos;
-       u32 *end;
-       for (pos = __va(page_hpa), end = pos + PAGE_SIZE / sizeof(u32);
+       u64 *pos;
+       u64 *end;
+
+       for (pos = __va(page_hpa), end = pos + PAGE_SIZE / sizeof(u64);
                      pos != end; pos++)
-               if (*pos != 0)
+               if (*pos != 0) {
+                       printk(KERN_ERR "%s: %p %llx\n", __FUNCTION__,
+                              pos, *pos);
                        return 0;
+               }
        return 1;
 }