[Xen-devel] [PATCH]: Allow HVM guests to use entire address space

[Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>]

HVM guests are allowed to use the entire virtual address space for
whatever they want, without any Xen hole.  __addr_ok() is therefore
always true for such guests.

Signed-off-by: Steven Smith <steven.smith@xxxxxxxxxxxxx>

diff -r 7188d1e4b0e1 xen/include/asm-x86/x86_64/uaccess.h
--- a/xen/include/asm-x86/x86_64/uaccess.h      Tue Nov 09 12:00:05 2010 +0000
+++ b/xen/include/asm-x86/x86_64/uaccess.h      Wed Nov 10 13:34:52 2010 +0000
@@ -20,7 +20,8 @@ void free_compat_arg_xlat(unsigned int c
  * non-canonical address (and thus fault) before ever reaching VIRT_START.
  */
 #define __addr_ok(addr) \
-    (((unsigned long)(addr) < (1UL<<48)) || \
+    (is_hvm_vcpu(current) || \
+     ((unsigned long)(addr) < (1UL<<48)) || \
      ((unsigned long)(addr) >= HYPERVISOR_VIRT_END))
 
 #define access_ok(addr, size) \
@@ -30,6 +31,7 @@ void free_compat_arg_xlat(unsigned int c
     (access_ok(addr, (count)*(size)))
 
 #define __compat_addr_ok(d, addr) \
+    (is_hvm_vcpu(current) || \
     ((unsigned long)(addr) < HYPERVISOR_COMPAT_VIRT_START(d))
 
 #define __compat_access_ok(d, addr, size) \



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