#include <linux/memblock.h>
#include <linux/hugetlb.h>
#include <linux/slab.h>
+#include <linux/of_fdt.h>
+#include <linux/libfdt.h>
#include <asm/pgalloc.h>
#include <asm/page.h>
}
early_param("disable_radix", parse_disable_radix);
+/*
+ * If we're running under a hypervisor, we currently can't do radix
+ * since we don't have the code to do the H_REGISTER_PROC_TBL hcall.
+ * We tell that we're running under a hypervisor by looking for the
+ * /chosen/ibm,architecture-vec-5 property.
+ */
+static void early_check_vec5(void)
+{
+ unsigned long root, chosen;
+ int size;
+ const u8 *vec5;
+
+ root = of_get_flat_dt_root();
+ chosen = of_get_flat_dt_subnode_by_name(root, "chosen");
+ if (chosen == -FDT_ERR_NOTFOUND)
+ return;
+ vec5 = of_get_flat_dt_prop(chosen, "ibm,architecture-vec-5", &size);
+ if (!vec5)
+ return;
+ cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX;
+}
+
void __init mmu_early_init_devtree(void)
{
/* Disable radix mode based on kernel command line. */
if (disable_radix || !(mfmsr() & MSR_HV))
cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX;
+ /*
+ * Check /chosen/ibm,architecture-vec-5 if running as a guest.
+ * When running bare-metal, we can use radix if we like
+ * even though the ibm,architecture-vec-5 property created by
+ * skiboot doesn't have the necessary bits set.
+ */
+ if (early_radix_enabled() && !(mfmsr() & MSR_HV))
+ early_check_vec5();
+
if (early_radix_enabled())
radix__early_init_devtree();
else