[PATCH v2 01/21] powerpc/copro: Fix faulting kernel segments

[Michael Neuling]

This fixes calculating the key bits (KP and KS) in the SLB VSID for kernel
mappings.

I'm not CCing this to stable as there are no uses of this currently.

Signed-off-by: Michael Neuling <mikey at neuling.org>
---
 arch/powerpc/mm/copro_fault.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
index f031a47..7a71d7f 100644
--- a/arch/powerpc/mm/copro_fault.c
+++ b/arch/powerpc/mm/copro_fault.c
@@ -100,7 +100,7 @@ EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
 
 int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
 {
-	u64 vsid;
+	u64 vsid, vsidkey;
 	int psize, ssize;
 
 	switch (REGION_ID(ea)) {
@@ -109,6 +109,7 @@ int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
 		psize = get_slice_psize(mm, ea);
 		ssize = user_segment_size(ea);
 		vsid = get_vsid(mm->context.id, ea, ssize);
+		vsidkey = SLB_VSID_USER;
 		break;
 	case VMALLOC_REGION_ID:
 		pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
@@ -118,19 +119,21 @@ int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
 			psize = mmu_io_psize;
 		ssize = mmu_kernel_ssize;
 		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
+		vsidkey = SLB_VSID_KERNEL;
 		break;
 	case KERNEL_REGION_ID:
 		pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea);
 		psize = mmu_linear_psize;
 		ssize = mmu_kernel_ssize;
 		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
+		vsidkey = SLB_VSID_KERNEL;
 		break;
 	default:
 		pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
 		return 1;
 	}
 
-	vsid = (vsid << slb_vsid_shift(ssize)) | SLB_VSID_USER;
+	vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
 
 	vsid |= mmu_psize_defs[psize].sllp |
 		((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
-- 
2.1.0