From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Sent: Wednesday, December 13, 2023 12:02 AM
+void amd_iommu_build_efr(u64 *efr, u64 *efr2)
+{
+ if (efr) {
+ *efr = (FEATURE_GT | FEATURE_GIOSUP | FEATURE_PPR);
+
+ /* 5-level v2 page table support */
+ *efr |= ((FEATURE_GATS_5LEVEL << FEATURE_GATS_SHIFT) &
+ FEATURE_GATS_MASK);
+
+ /* 3-level GCR3 table support */
+ *efr |= ((FEATURE_GLX_3LEVEL << FEATURE_GLX_SHIFT) &
+ FEATURE_GLX_MASK);
+
+ /* 16-bit PASMAX support */
+ *efr |= ((FEATURE_PASMAX_16 << FEATURE_PASMAX_SHIFT)
&
+ FEATURE_PASMAX_MASK);
+ }
+
+ if (efr2)
+ *efr2 = 0;
+}
Don't this need to check the support in hw?