[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>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index b9ba240144b7..8cf3688f7e70 100644
--- 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;
 }