[Xen-changelog] [xen stable-4.3] x86: don't allow Dom0 access to the MSI address range

[patchbot@xxxxxxx]

commit b9e3a6e16a6f46e20d300e21100ac1aeadac1c33
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Sep 9 11:45:16 2013 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Sep 9 11:45:16 2013 +0200

    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@xxxxxxxx>
    Acked-by Xiantao Zhang <xiantao.zhang@xxxxxxxxx>
    master commit: 850188e1278cecd1dfb9b936024bee2d8dfdcc18
    master date: 2013-08-27 11:11:38 +0200
---
 xen/arch/x86/domain_build.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/domain_build.c b/xen/arch/x86/domain_build.c
index 03fe845..8365f32 100644
--- 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++ )
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.3

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