s390/mm: remember the int code for the last gmap fault

For nested virtualization, we want to know if we are handling a protection
exception, because these can directly be forwarded to the guest without
additional checks.

Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

2 files changed, 2 insertions, 0 deletions

diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 94c80b6d031d..8c2922f540f9 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -110,6 +110,7 @@ struct thread_struct {
         mm_segment_t mm_segment;
         unsigned long gmap_addr;        /* address of last gmap fault. */
         unsigned int gmap_write_flag;   /* gmap fault write indication */
+        unsigned int gmap_int_code;     /* int code of last gmap fault */
         unsigned int gmap_pfault;       /* signal of a pending guest pfault */
         struct per_regs per_user;       /* User specified PER registers */
         struct per_event per_event;     /* Cause of the last PER trap */
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index b84416c11c43..730e0d3aa840 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -419,6 +419,7 @@ static inline int do_exception(struct pt_regs *regs, int access)
         if (gmap) {
                 current->thread.gmap_addr = address;
                 current->thread.gmap_write_flag = !!(flags & FAULT_FLAG_WRITE);
+                current->thread.gmap_int_code = regs->int_code & 0xffff;
                 address = __gmap_translate(gmap, address);
                 if (address == -EFAULT) {
                         fault = VM_FAULT_BADMAP;