[Xen-devel] [PATCH] linux/x86: make xen_change_pte_range() compatible with CONFIG_HIGHPTE

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

Cannot use virt_to_machine() on a kmap()-ed address.

As usual, written and tested on 2.6.24 and made apply to the 2.6.18
tree without further testing.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: head-2008-01-28/arch/i386/mm/hypervisor.c
===================================================================
--- head-2008-01-28.orig/arch/i386/mm/hypervisor.c      2007-10-19 
17:18:37.000000000 +0200
+++ head-2008-01-28/arch/i386/mm/hypervisor.c   2008-01-31 17:38:56.000000000 
+0100
@@ -569,7 +569,9 @@ int xen_change_pte_range(struct mm_struc
        pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
        do {
                if (pte_present(*pte)) {
-                       u[i].ptr = virt_to_machine(pte) | 
MMU_PT_UPDATE_PRESERVE_AD;
+                       u[i].ptr = (__pmd_val(*pmd) & PHYSICAL_PAGE_MASK)
+                                  | ((unsigned long)pte & ~PAGE_MASK)
+                                  | MMU_PT_UPDATE_PRESERVE_AD;
                        u[i].val = __pte_val(pte_modify(*pte, newprot));
                        if (++i == MAX_BATCHED_FULL_PTES) {
                                if ((rc = HYPERVISOR_mmu_update(




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