[Xen-devel] [PATCH]: Allow tools to map arbitrarily large machphys_mfn_list on 32bit dom0

[Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>]

This permits suspend/resume to work with 32bit dom0/tools. AFAICT the
limit to MACH2PHYS_COMPAT_NR_ENTRIES is redundant since that refers to a
limit in kernel mappings under 32bit hypervisors, not userspace where
there may be gigabytes of useful virtual space for this.

Suggested-by: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
Signed-off-by: Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>

diff -r cf558cb8b92b xen/arch/x86/x86_64/compat/mm.c
--- a/xen/arch/x86/x86_64/compat/mm.c   Mon Mar 07 17:52:44 2011 +0000
+++ b/xen/arch/x86/x86_64/compat/mm.c   Mon Mar 14 14:58:04 2011 +0000
@@ -162,8 +162,7 @@ int compat_arch_memory_op(int op, XEN_GU
             return -EFAULT;
 
         limit = (unsigned long)(compat_machine_to_phys_mapping +
-            min_t(unsigned long, max_page,
-                  MACH2PHYS_COMPAT_NR_ENTRIES(current->domain)));
+                    (unsigned long)max_page);
         if ( limit > RDWR_COMPAT_MPT_VIRT_END )
             limit = RDWR_COMPAT_MPT_VIRT_END;
         for ( i = 0, v = RDWR_COMPAT_MPT_VIRT_START, last_mfn = 0;



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