s390/kvm: cleanup/fix handle_tpi()

- add missing specification exception check
- remove one level of indentation
- use defines instead of magic numbers

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index cb07147..d64382c 100644 (file)
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -14,6 +14,7 @@
 #include <linux/kvm.h>
 #include <linux/gfp.h>
 #include <linux/errno.h>
+#include <asm/asm-offsets.h>
 #include <asm/current.h>
 #include <asm/debug.h>
 #include <asm/ebcdic.h>
@@ -129,39 +130,44 @@ static int handle_skey(struct kvm_vcpu *vcpu)
 
 static int handle_tpi(struct kvm_vcpu *vcpu)
 {
-       u64 addr;
        struct kvm_s390_interrupt_info *inti;
+       u64 addr;
        int cc;
 
        addr = kvm_s390_get_base_disp_s(vcpu);
-
+       if (addr & 3) {
+               kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+               goto out;
+       }
+       cc = 0;
        inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->run->s.regs.crs[6], 0);
-       if (inti) {
-               if (addr) {
-                       /*
-                        * Store the two-word I/O interruption code into the
-                        * provided area.
-                        */
-                       put_guest(vcpu, inti->io.subchannel_id, (u16 *) addr);
-                       put_guest(vcpu, inti->io.subchannel_nr, (u16 *) (addr + 2));
-                       put_guest(vcpu, inti->io.io_int_parm, (u32 *) (addr + 4));
-               } else {
-                       /*
-                        * Store the three-word I/O interruption code into
-                        * the appropriate lowcore area.
-                        */
-                       put_guest(vcpu, inti->io.subchannel_id, (u16 *) 184);
-                       put_guest(vcpu, inti->io.subchannel_nr, (u16 *) 186);
-                       put_guest(vcpu, inti->io.io_int_parm, (u32 *) 188);
-                       put_guest(vcpu, inti->io.io_int_word, (u32 *) 192);
-               }
-               cc = 1;
-       } else
-               cc = 0;
+       if (!inti)
+               goto no_interrupt;
+       cc = 1;
+       if (addr) {
+               /*
+                * Store the two-word I/O interruption code into the
+                * provided area.
+                */
+               put_guest(vcpu, inti->io.subchannel_id, (u16 *) addr);
+               put_guest(vcpu, inti->io.subchannel_nr, (u16 *) (addr + 2));
+               put_guest(vcpu, inti->io.io_int_parm, (u32 *) (addr + 4));
+       } else {
+               /*
+                * Store the three-word I/O interruption code into
+                * the appropriate lowcore area.
+                */
+               put_guest(vcpu, inti->io.subchannel_id, (u16 *) __LC_SUBCHANNEL_ID);
+               put_guest(vcpu, inti->io.subchannel_nr, (u16 *) __LC_SUBCHANNEL_NR);
+               put_guest(vcpu, inti->io.io_int_parm, (u32 *) __LC_IO_INT_PARM);
+               put_guest(vcpu, inti->io.io_int_word, (u32 *) __LC_IO_INT_WORD);
+       }
        kfree(inti);
+no_interrupt:
        /* Set condition code and we're done. */
        vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
        vcpu->arch.sie_block->gpsw.mask |= (cc & 3ul) << 44;
+out:
        return 0;
 }