---

yaml --- r: 217849 b: refs/heads/master c: cfd8951 h: refs/heads/master i: 217847: d319bb8 v: v3
git-mirror · Oct 22, 2010 · 4bb89de · 4bb89de
1 parent f158bd9
commit 4bb89de
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Showing 3 changed files with 23 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 33a847502b0338351cebd8fc0c68ac796cfadbbd
+refs/heads/master: cfd8951e082a589637f9de3c33efd3218fdb3c03
diff --git a/trunk/arch/x86/include/asm/xen/page.h b/trunk/arch/x86/include/asm/xen/page.h
@@ -41,10 +41,17 @@ extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
 
 static inline unsigned long pfn_to_mfn(unsigned long pfn)
 {
+	unsigned long mfn;
+
 	if (xen_feature(XENFEAT_auto_translated_physmap))
 		return pfn;
 
-	return get_phys_to_machine(pfn) & ~FOREIGN_FRAME_BIT;
+	mfn = get_phys_to_machine(pfn);
+
+	if (mfn != INVALID_P2M_ENTRY)
+		mfn &= ~FOREIGN_FRAME_BIT;
+
+	return mfn;
 }
 
 static inline int phys_to_machine_mapping_valid(unsigned long pfn)

diff --git a/trunk/arch/x86/xen/mmu.c b/trunk/arch/x86/xen/mmu.c
@@ -745,7 +745,20 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
 	if (val & _PAGE_PRESENT) {
 		unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
 		pteval_t flags = val & PTE_FLAGS_MASK;
-		val = ((pteval_t)pfn_to_mfn(pfn) << PAGE_SHIFT) | flags;
+		unsigned long mfn = pfn_to_mfn(pfn);
+
+		/*
+		 * If there's no mfn for the pfn, then just create an
+		 * empty non-present pte.  Unfortunately this loses
+		 * information about the original pfn, so
+		 * pte_mfn_to_pfn is asymmetric.
+		 */
+		if (unlikely(mfn == INVALID_P2M_ENTRY)) {
+			mfn = 0;
+			flags = 0;
+		}
+
+		val = ((pteval_t)mfn << PAGE_SHIFT) | flags;
 	}
 
 	return val;