[Xen-devel] [PATCH] VT-d: don't needlessly suppress page table sharing

["Jan Beulich" <JBeulich@xxxxxxxx>]

Despite the mid term goal being to do away with the sharing there's no
point in suppressing it in cases where it can be used now.

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

--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1805,7 +1805,7 @@ void iommu_pte_flush(struct domain *d, u
     }
 }
 
-static int vtd_ept_page_compatible(struct iommu *iommu)
+static int __init vtd_ept_page_compatible(struct iommu *iommu)
 {
     u64 ept_cap, vtd_cap = iommu->cap;
 
@@ -1814,8 +1814,8 @@ static int vtd_ept_page_compatible(struc
     if ( rdmsr_safe(MSR_IA32_VMX_EPT_VPID_CAP, ept_cap) != 0 ) 
         return 0;
 
-    return ( ept_has_2mb(ept_cap) == cap_sps_2mb(vtd_cap) 
-             && ept_has_1gb(ept_cap) == cap_sps_1gb(vtd_cap) );
+    return (ept_has_2mb(ept_cap) && opt_hap_2mb) == cap_sps_2mb(vtd_cap) &&
+           (ept_has_1gb(ept_cap) && opt_hap_1gb) == cap_sps_1gb(vtd_cap);
 }
 
 /*




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