Hi,
Patch below is needed to make my system work stable in PAE mode.
Havn't seen problems without PAE, not sure whenever thats just
pure luck or whenever there is a bug in my PAE xenlinux kernel.
To me it looks like a generic bug though.
I've actually trapped into problems with unpin only: A process
exits, somewhere in exit_mm() the page tables are unpinned,
shortly thereafter the mappings are cleared. While doing so the
kernel oopses in zap_pte_range(), on page table write access.
Probably due to some stale tlb entry where the page is still
tagged read-only.
cheers,
Gerd
Index: linux-2.6.11/arch/xen/i386/mm/pgtable.c
===================================================================
--- linux-2.6.11.orig/arch/xen/i386/mm/pgtable.c 2005-06-22
16:25:17.000000000 +0200
+++ linux-2.6.11/arch/xen/i386/mm/pgtable.c 2005-06-23 18:20:45.000000000
+0200
@@ -486,7 +486,8 @@ void mm_pin(struct mm_struct *mm)
mm_walk(mm, PAGE_KERNEL_RO);
HYPERVISOR_update_va_mapping(
(unsigned long)mm->pgd,
- pfn_pte(virt_to_phys(mm->pgd)>>PAGE_SHIFT, PAGE_KERNEL_RO), 0);
+ pfn_pte(virt_to_phys(mm->pgd)>>PAGE_SHIFT, PAGE_KERNEL_RO),
+ UVMF_TLB_FLUSH);
xen_pgd_pin(__pa(mm->pgd));
mm->context.pinned = 1;
spin_lock(&mm_unpinned_lock);
@@ -505,6 +506,7 @@ void mm_unpin(struct mm_struct *mm)
(unsigned long)mm->pgd,
pfn_pte(virt_to_phys(mm->pgd)>>PAGE_SHIFT, PAGE_KERNEL), 0);
mm_walk(mm, PAGE_KERNEL);
+ xen_tlb_flush();
mm->context.pinned = 0;
spin_lock(&mm_unpinned_lock);
list_add(&mm->context.unpinned, &mm_unpinned);
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