ia64/xen-unstable

changeset 14859:6a4c6d8a00f5

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Fix map_pages_to_xen() to atomically switch between valid mappings.
This is needed to successfully boot a debug=y build of xen on kvm.
Reported by Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Keir Fraser <keir@xensource.com>
author kfraser@localhost.localdomain
date Sun Apr 15 21:56:38 2007 +0100 (2007-04-15)
parents 249de074617f
children a9aa7c29eda8
files xen/arch/x86/mm.c
line diff
     1.1 --- a/xen/arch/x86/mm.c	Fri Apr 13 18:14:06 2007 +0100
     1.2 +++ b/xen/arch/x86/mm.c	Sun Apr 15 21:56:38 2007 +0100
     1.3 @@ -3424,7 +3424,7 @@ int map_pages_to_xen(
     1.4          {
     1.5              /* Super-page mapping. */
     1.6              ol2e = *pl2e;
     1.7 -            l2e_write(pl2e, l2e_from_pfn(mfn, flags|_PAGE_PSE));
     1.8 +            l2e_write_atomic(pl2e, l2e_from_pfn(mfn, flags|_PAGE_PSE));
     1.9  
    1.10              if ( (l2e_get_flags(ol2e) & _PAGE_PRESENT) )
    1.11              {
    1.12 @@ -3454,14 +3454,14 @@ int map_pages_to_xen(
    1.13                      l1e_write(&pl1e[i],
    1.14                                l1e_from_pfn(l2e_get_pfn(*pl2e) + i,
    1.15                                             l2e_get_flags(*pl2e) & ~_PAGE_PSE));
    1.16 -                l2e_write(pl2e, l2e_from_pfn(virt_to_mfn(pl1e),
    1.17 -                                             __PAGE_HYPERVISOR));
    1.18 +                l2e_write_atomic(pl2e, l2e_from_pfn(virt_to_mfn(pl1e),
    1.19 +                                                    __PAGE_HYPERVISOR));
    1.20                  local_flush_tlb_pge();
    1.21              }
    1.22  
    1.23              pl1e  = l2e_to_l1e(*pl2e) + l1_table_offset(virt);
    1.24              ol1e  = *pl1e;
    1.25 -            l1e_write(pl1e, l1e_from_pfn(mfn, flags));
    1.26 +            l1e_write_atomic(pl1e, l1e_from_pfn(mfn, flags));
    1.27              if ( (l1e_get_flags(ol1e) & _PAGE_PRESENT) )
    1.28                  local_flush_tlb_one(virt);
    1.29