@@ -42,6 +42,8 @@
#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>
@@ -344,12 +346,43 @@ static int __init parse_disable_radix(char *p)
}
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)
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
Currently, if the kernel is running on a POWER9 processor under a hypervisor, it will try to use the radix MMU even though it doesn't have the necessary code to use radix under a hypervisor (it doesn't negotiate use of radix, and it doesn't do the H_REGISTER_PROC_TBL hcall). The result is that the guest kernel will crash when it tries to turn on the MMU. This fixes it by looking for the /chosen/ibm,architecture-vec-5 property, and if it exists, clears the radix MMU feature bit, before we decide whether to initialize for radix or HPT. This property is created by the hypervisor as a result of the guest calling the ibm,client-architecture-support method to indicate its capabilities, so it will indicate whether the hypervisor agreed to us using radix. Systems without a hypervisor may have this property also (for example, skiboot creates it), so we check the HV bit in the MSR to see whether we are running as a guest or not. If we are in hypervisor mode, then we can do whatever we like including using the radix MMU. The reason for using this property is that in future, when we have support for using radix under a hypervisor, we will need to check this property to see whether the hypervisor agreed to us using radix. Cc: stable@vger.kernel.org # v4.8+ Signed-off-by: Paul Mackerras <paulus@ozlabs.org> --- arch/powerpc/mm/init_64.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)