[Qemu-devel] [PATCH v2 26/30] s390x/tcg: switch to new SIGP handling code

[David Hildenbrand <david@redhat.com>]

This effectively enables experimental SMP support. Floating interrupts are
still a mess, so allow it but print a big warning. There also seems
to be a problem with CPU hotplug (after the main loop started).

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/s390x/s390-virtio-ccw.c |  4 +---
 target/s390x/helper.h      |  2 +-
 target/s390x/misc_helper.c | 42 ++++++------------------------------------
 target/s390x/translate.c   |  5 +++--
 4 files changed, 11 insertions(+), 42 deletions(-)

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index d188ce17ba..3a23fd3f27 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -58,9 +58,7 @@ static void s390_init_cpus(MachineState *machine)
     int i;
 
     if (tcg_enabled() && max_cpus > 1) {
-        error_report("Number of SMP CPUs requested (%d) exceeds max CPUs "
-                     "supported by TCG (1) on s390x", max_cpus);
-        exit(1);
+        error_report("WARNING: SMP support on s390x is experimental!");
     }
 
     /* initialize possible_cpus */
diff --git a/target/s390x/helper.h b/target/s390x/helper.h
index 52c2963baa..81c5727168 100644
--- a/target/s390x/helper.h
+++ b/target/s390x/helper.h
@@ -138,7 +138,7 @@ DEF_HELPER_FLAGS_3(sske, TCG_CALL_NO_RWG, void, env, i64, i64)
 DEF_HELPER_FLAGS_2(rrbe, TCG_CALL_NO_RWG, i32, env, i64)
 DEF_HELPER_4(mvcs, i32, env, i64, i64, i64)
 DEF_HELPER_4(mvcp, i32, env, i64, i64, i64)
-DEF_HELPER_4(sigp, i32, env, i64, i32, i64)
+DEF_HELPER_4(sigp, i32, env, i64, i32, i32)
 DEF_HELPER_FLAGS_2(sacf, TCG_CALL_NO_WG, void, env, i64)
 DEF_HELPER_FLAGS_4(idte, TCG_CALL_NO_RWG, void, env, i64, i64, i32)
 DEF_HELPER_FLAGS_4(ipte, TCG_CALL_NO_RWG, void, env, i64, i64, i32)
diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c
index 0b93381188..0b3613ea5f 100644
--- a/target/s390x/misc_helper.c
+++ b/target/s390x/misc_helper.c
@@ -319,44 +319,14 @@ uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0,
 }
 
 uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
-                      uint64_t cpu_addr)
+                      uint32_t r3)
 {
-    int cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+    int cc;
 
-    HELPER_LOG("%s: %016" PRIx64 " %08x %016" PRIx64 "\n",
-               __func__, order_code, r1, cpu_addr);
-
-    /* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register"
-       as parameter (input). Status (output) is always R1. */
-
-    switch (order_code & SIGP_ORDER_MASK) {
-    case SIGP_SET_ARCH:
-        /* switch arch */
-        break;
-    case SIGP_SENSE:
-        /* enumerate CPU status */
-        if (cpu_addr) {
-            /* XXX implement when SMP comes */
-            return 3;
-        }
-        env->regs[r1] &= 0xffffffff00000000ULL;
-        cc = 1;
-        break;
-#if !defined(CONFIG_USER_ONLY)
-    case SIGP_RESTART:
-        qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
-        cpu_loop_exit(CPU(s390_env_get_cpu(env)));
-        break;
-    case SIGP_STOP:
-        qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
-        cpu_loop_exit(CPU(s390_env_get_cpu(env)));
-        break;
-#endif
-    default:
-        /* unknown sigp */
-        fprintf(stderr, "XXX unknown sigp: 0x%" PRIx64 "\n", order_code);
-        cc = SIGP_CC_NOT_OPERATIONAL;
-    }
+    /* TODO: needed to inject interrupts  - push further down */
+    qemu_mutex_lock_iothread();
+    cc = handle_sigp(env, order_code & SIGP_ORDER_MASK, r1, r3);
+    qemu_mutex_unlock_iothread();
 
     return cc;
 }
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index 405d94b87d..6a2e084f87 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -3710,11 +3710,12 @@ static ExitStatus op_servc(DisasContext *s, DisasOps *o)
 static ExitStatus op_sigp(DisasContext *s, DisasOps *o)
 {
     TCGv_i32 r1 = tcg_const_i32(get_field(s->fields, r1));
+    TCGv_i32 r3 = tcg_const_i32(get_field(s->fields, r3));
     check_privileged(s);
-    potential_page_fault(s);
-    gen_helper_sigp(cc_op, cpu_env, o->in2, r1, o->in1);
+    gen_helper_sigp(cc_op, cpu_env, o->in2, r1, r3);
     set_cc_static(s);
     tcg_temp_free_i32(r1);
+    tcg_temp_free_i32(r3);
     return NO_EXIT;
 }
 #endif
-- 
2.13.5