We really don't want the mmconf window to move/disappear whenever we
use is ourselves, not only when we enabled it.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -2297,8 +2297,7 @@ static int emulate_privileged_op(struct 
                 goto fail;
             if (
 #ifdef CONFIG_X86_64
-                 (pci_probe & PCI_PROBE_MMCONF) &&
-                 (pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF) ?
+                 (pci_probe & PCI_PROBE_MASK) == PCI_PROBE_MMCONF ?
                  val != msr_content :
 #endif
                  ((val ^ msr_content) &