target-s390x: PER storage-alteration event support

For the PER storage-alteration event we can use the QEMU watchpoint
infrastructure. When PER is enabled or PER control register changed we
enable the corresponding watchpoints. When a watchpoint arises we can
save the event. Unfortunately the current code does not provide the
address space used to trigger the watchpoint. For now we assume it comes
from the default ASC.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 22 insertions, 3 deletions

diff --git a/target-s390x/mem_helper.c b/target-s390x/mem_helper.c
index 6427ee9b6b..d03f9fd2f3 100644
--- a/target-s390x/mem_helper.c
+++ b/target-s390x/mem_helper.c
@@ -841,11 +841,17 @@ uint32_t HELPER(trt)(CPUS390XState *env, uint32_t len, uint64_t array,
 void HELPER(lctlg)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    bool PERchanged = false;
     int i;
     uint64_t src = a2;
+    uint64_t val;
 
     for (i = r1;; i = (i + 1) % 16) {
-        env->cregs[i] = cpu_ldq_data(env, src);
+        val = cpu_ldq_data(env, src);
+        if (env->cregs[i] != val && i >= 9 && i <= 11) {
+            PERchanged = true;
+        }
+        env->cregs[i] = val;
         HELPER_LOG("load ctl %d from 0x%" PRIx64 " == 0x%" PRIx64 "\n",
                    i, src, env->cregs[i]);
         src += sizeof(uint64_t);
@@ -855,18 +861,27 @@ void HELPER(lctlg)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
         }
     }
 
+    if (PERchanged && env->psw.mask & PSW_MASK_PER) {
+        s390_cpu_recompute_watchpoints(CPU(cpu));
+    }
+
     tlb_flush(CPU(cpu), 1);
 }
 
 void HELPER(lctl)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    bool PERchanged = false;
     int i;
     uint64_t src = a2;
+    uint32_t val;
 
     for (i = r1;; i = (i + 1) % 16) {
-        env->cregs[i] = (env->cregs[i] & 0xFFFFFFFF00000000ULL) |
-            cpu_ldl_data(env, src);
+        val = cpu_ldl_data(env, src);
+        if ((uint32_t)env->cregs[i] != val && i >= 9 && i <= 11) {
+            PERchanged = true;
+        }
+        env->cregs[i] = (env->cregs[i] & 0xFFFFFFFF00000000ULL) | val;
         src += sizeof(uint32_t);
 
         if (i == r3) {
@@ -874,6 +889,10 @@ void HELPER(lctl)(CPUS390XState *env, uint32_t r1, uint64_t a2, uint32_t r3)
         }
     }
 
+    if (PERchanged && env->psw.mask & PSW_MASK_PER) {
+        s390_cpu_recompute_watchpoints(CPU(cpu));
+    }
+
     tlb_flush(CPU(cpu), 1);
 }