s390: add support for vector extension

The vector extension introduces 32 128-bit vector registers and a set of
instruction to operate on the vector registers.

The kernel can control the use of vector registers for the problem state
program with a bit in control register 0. Once enabled for a process the
kernel needs to retain the content of the vector registers on context
switch. The signal frame is extended to include the vector registers.
Two new register sets NT_S390_VXRS_LOW and NT_S390_VXRS_HIGH are added
to the regset interface for the debugger and core dumps.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index bba0e2469254..13cae5b152d7 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -179,6 +179,9 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
                         goto out;
         }
 #else
+        if (MACHINE_HAS_VX)
+                lc->vector_save_area_addr =
+                        (unsigned long) &lc->vector_save_area;
         if (vdso_alloc_per_cpu(lc))
                 goto out;
 #endif