debuggers.hg

changeset 20984:3bb163b74673

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x86_64: widen bit width usable for struct domain allocation

With it being a PDX (instead of a PFN) that gets stored when a 32-bit
quantity is needed, we should also account for the bits removed during
PFN-to-PDX conversion when doing the allocation.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Fri Feb 12 09:24:18 2010 +0000 (2010-02-12)
parents a948403c8f99
children 54c09c71fe47
files xen/arch/x86/domain.c
line diff
     1.1 --- a/xen/arch/x86/domain.c	Fri Feb 12 09:23:10 2010 +0000
     1.2 +++ b/xen/arch/x86/domain.c	Fri Feb 12 09:24:18 2010 +0000
     1.3 @@ -174,11 +174,15 @@ struct domain *alloc_domain_struct(void)
     1.4  {
     1.5      struct domain *d;
     1.6      /*
     1.7 -     * We pack the MFN of the domain structure into a 32-bit field within
     1.8 +     * We pack the PDX of the domain structure into a 32-bit field within
     1.9       * the page_info structure. Hence the MEMF_bits() restriction.
    1.10       */
    1.11 -    d = alloc_xenheap_pages(
    1.12 -        get_order_from_bytes(sizeof(*d)), MEMF_bits(32 + PAGE_SHIFT));
    1.13 +    unsigned int bits = 32 + PAGE_SHIFT;
    1.14 +
    1.15 +#ifdef __x86_64__
    1.16 +    bits += pfn_pdx_hole_shift;
    1.17 +#endif
    1.18 +    d = alloc_xenheap_pages(get_order_from_bytes(sizeof(*d)), MEMF_bits(bits));
    1.19      if ( d != NULL )
    1.20          memset(d, 0, sizeof(*d));
    1.21      return d;