[PATCH 23/33] KVM: MMU: If an empty shadow page is not empty, report more info

Signed-off-by: Avi Kivity <[email protected]>

Index: linux-2.6/drivers/kvm/mmu.c
===================================================================
--- linux-2.6.orig/drivers/kvm/mmu.c
+++ linux-2.6/drivers/kvm/mmu.c
@@ -305,12 +305,16 @@ static void rmap_write_protect(struct kv
 
 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;
 }
 
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---

• References:
  • [PATCH 0/33] KVM: MMU: Cache shadow page tables
    • From: Avi Kivity <[email protected]>

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