[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[PATCH] x86/CPUID: suppress IOMMU related hypervisor leaf data



Now that the IOMMU for guests can't be enabled "on demand" anymore,
there's also no reason to expose the related CPUID bit "just in case".

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

--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -1050,7 +1050,8 @@ void cpuid_hypervisor_leaves(const struc
          * Indicate that memory mapped from other domains (either grants or
          * foreign pages) has valid IOMMU entries.
          */
-        res->a |= XEN_HVM_CPUID_IOMMU_MAPPINGS;
+        if ( is_iommu_enabled(d) )
+            res->a |= XEN_HVM_CPUID_IOMMU_MAPPINGS;
 
         /* Indicate presence of vcpu id and set it in ebx */
         res->a |= XEN_HVM_CPUID_VCPU_ID_PRESENT;



 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.