File 521c6d4a-x86-don-t-allow-Dom0-access-to-the-MSI-address-range.patch of Package xen

# Commit 850188e1278cecd1dfb9b936024bee2d8dfdcc18
# Date 2013-08-27 11:11:38 +0200
# Author Jan Beulich <jbeulich@suse.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86: don't allow Dom0 access to the MSI address range

In particular, MMIO assignments should not be done using this area.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by Xiantao Zhang <xiantao.zhang@intel.com>

--- a/xen/arch/x86/domain_build.c
+++ b/xen/arch/x86/domain_build.c
@@ -1122,6 +1122,10 @@ int __init construct_dom0(
         if ( !rangeset_contains_singleton(mmio_ro_ranges, mfn) )
             rc |= iomem_deny_access(dom0, mfn, mfn);
     }
+    /* MSI range. */
+    rc |= iomem_deny_access(dom0, paddr_to_pfn(MSI_ADDR_BASE_LO),
+                            paddr_to_pfn(MSI_ADDR_BASE_LO +
+                                         MSI_ADDR_DEST_ID_MASK));
 
     /* Remove access to E820_UNUSABLE I/O regions above 1MB. */
     for ( i = 0; i < e820.nr_map; i++ )