powerpc/64s/radix: Fix radix segment exception handling

Commit 48e7b76957 ("powerpc/64s/hash: Convert SLB miss handlers to C")
broke the radix-mode segment exception handler. In radix mode, this is
exception is not an SLB miss, rather it signals that the EA is outside
the range translated by any page table.

The commit lost the radix feature alternate code patch, which can
cause faults to some EAs to kernel BUG at arch/powerpc/mm/slb.c:639!

The original radix code would send faults to slb_miss_large_addr,
which would end up faulting due to slb_addr_limit being 0. This patch
sends radix directly to do_bad_slb_fault, which is a bit clearer.

Fixes: 48e7b7695745 ("powerpc/64s/hash: Convert SLB miss handlers to C")
Cc: stable@vger.kernel.org # v4.20+
Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index a5b8fba..9481a11 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -656,11 +656,17 @@ EXC_COMMON_BEGIN(data_access_slb_common)
        ld      r4,PACA_EXSLB+EX_DAR(r13)
        std     r4,_DAR(r1)
        addi    r3,r1,STACK_FRAME_OVERHEAD
+BEGIN_MMU_FTR_SECTION
+       /* HPT case, do SLB fault */
        bl      do_slb_fault
        cmpdi   r3,0
        bne-    1f
        b       fast_exception_return
 1:     /* Error case */
+MMU_FTR_SECTION_ELSE
+       /* Radix case, access is outside page table range */
+       li      r3,-EFAULT
+ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
        std     r3,RESULT(r1)
        bl      save_nvgprs
        RECONCILE_IRQ_STATE(r10, r11)
@@ -705,11 +711,17 @@ EXC_COMMON_BEGIN(instruction_access_slb_common)
        EXCEPTION_PROLOG_COMMON(0x480, PACA_EXSLB)
        ld      r4,_NIP(r1)
        addi    r3,r1,STACK_FRAME_OVERHEAD
+BEGIN_MMU_FTR_SECTION
+       /* HPT case, do SLB fault */
        bl      do_slb_fault
        cmpdi   r3,0
        bne-    1f
        b       fast_exception_return
 1:     /* Error case */
+MMU_FTR_SECTION_ELSE
+       /* Radix case, access is outside page table range */
+       li      r3,-EFAULT
+ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
        std     r3,RESULT(r1)
        bl      save_nvgprs
        RECONCILE_IRQ_STATE(r10, r11)