powerpc/copro: Fix faulting kernel segments

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@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
index f031a47d7701e60d349f08b46365e2912844066b..7a71d7f81cf6295121458dec6cccea02911192c9 100644 (file)
--- 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);