[Xen-changelog] [xen master] x86/bigmem: eliminate struct domain address width restriction

[patchbot@xxxxxxx]

commit fb34ff7452fda9966915cba8cf3ed42d4ca738fc
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Sep 25 09:02:02 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Sep 25 09:02:02 2015 +0200

    x86/bigmem: eliminate struct domain address width restriction
    
    PDX-es are 64 bits wide in that case, and hence no limit needs to be
    enforced.
    
    Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/domain.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 0b97912..dc3bb08 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -203,6 +203,7 @@ smap_check_policy_t smap_policy_change(struct vcpu *v,
     return old_policy;
 }
 
+#ifndef CONFIG_BIGMEM
 /*
  * The hole may be at or above the 44-bit boundary, so we need to determine
  * the total bit count until reaching 32 significant (not squashed out) bits
@@ -224,10 +225,14 @@ static unsigned int __init noinline 
_domain_struct_bits(void)
 
     return bits;
 }
+#endif
 
 struct domain *alloc_domain_struct(void)
 {
     struct domain *d;
+#ifdef CONFIG_BIGMEM
+    const unsigned int bits = 0;
+#else
     /*
      * We pack the PDX of the domain structure into a 32-bit field within
      * the page_info structure. Hence the MEMF_bits() restriction.
@@ -236,6 +241,7 @@ struct domain *alloc_domain_struct(void)
 
     if ( unlikely(!bits) )
          bits = _domain_struct_bits();
+#endif
 
     BUILD_BUG_ON(sizeof(*d) > PAGE_SIZE);
     d = alloc_xenheap_pages(0, MEMF_bits(bits));
--
generated by git-patchbot for /home/xen/git/xen.git#master

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