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-rw-r--r--arch/x86/xen/mmu_pv.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index 9d9ae6650aa1..7397d8b8459d 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -2025,7 +2025,8 @@ static unsigned long __init xen_read_phys_ulong(phys_addr_t addr)
/*
* Translate a virtual address to a physical one without relying on mapped
- * page tables.
+ * page tables. Don't rely on big pages being aligned in (guest) physical
+ * space!
*/
static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
{
@@ -2046,7 +2047,7 @@ static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
sizeof(pud)));
if (!pud_present(pud))
return 0;
- pa = pud_pfn(pud) << PAGE_SHIFT;
+ pa = pud_val(pud) & PTE_PFN_MASK;
if (pud_large(pud))
return pa + (vaddr & ~PUD_MASK);
@@ -2054,7 +2055,7 @@ static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
sizeof(pmd)));
if (!pmd_present(pmd))
return 0;
- pa = pmd_pfn(pmd) << PAGE_SHIFT;
+ pa = pmd_val(pmd) & PTE_PFN_MASK;
if (pmd_large(pmd))
return pa + (vaddr & ~PMD_MASK);

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