target/ppc: Fix doorbell delivery to threads in powersave

Doorbell exceptions are not not cleared when they cause a wake from
powersave state, only when they take the corresponding interrupt.
The sreset-on-wake logic must avoid clearing the interrupt in this
case.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index 701abe1b6d49e767a2ea8e451919d1e0caeaeb99..b619a6adde32e41eee012838e141327b6ff75ae1 100644 (file)
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -2237,7 +2237,9 @@ static void p8_deliver_interrupt(CPUPPCState *env, int interrupt)
         powerpc_excp(cpu, POWERPC_EXCP_DECR);
         break;
     case PPC_INTERRUPT_DOORBELL:
-        env->pending_interrupts &= ~PPC_INTERRUPT_DOORBELL;
+        if (!env->resume_as_sreset) {
+            env->pending_interrupts &= ~PPC_INTERRUPT_DOORBELL;
+        }
         if (is_book3s_arch2x(env)) {
             powerpc_excp(cpu, POWERPC_EXCP_SDOOR);
         } else {
@@ -2245,7 +2247,9 @@ static void p8_deliver_interrupt(CPUPPCState *env, int interrupt)
         }
         break;
     case PPC_INTERRUPT_HDOORBELL:
-        env->pending_interrupts &= ~PPC_INTERRUPT_HDOORBELL;
+        if (!env->resume_as_sreset) {
+            env->pending_interrupts &= ~PPC_INTERRUPT_HDOORBELL;
+        }
         powerpc_excp(cpu, POWERPC_EXCP_SDOOR_HV);
         break;
     case PPC_INTERRUPT_PERFM:
@@ -2301,6 +2305,7 @@ static void p9_deliver_interrupt(CPUPPCState *env, int interrupt)
 
     case PPC_INTERRUPT_HDECR: /* Hypervisor decrementer exception */
         /* HDEC clears on delivery */
+        /* XXX: should not see an HDEC if resume_as_sreset. assert? */
         env->pending_interrupts &= ~PPC_INTERRUPT_HDECR;
         powerpc_excp(cpu, POWERPC_EXCP_HDECR);
         break;
@@ -2320,11 +2325,15 @@ static void p9_deliver_interrupt(CPUPPCState *env, int interrupt)
         powerpc_excp(cpu, POWERPC_EXCP_DECR);
         break;
     case PPC_INTERRUPT_DOORBELL:
-        env->pending_interrupts &= ~PPC_INTERRUPT_DOORBELL;
+        if (!env->resume_as_sreset) {
+            env->pending_interrupts &= ~PPC_INTERRUPT_DOORBELL;
+        }
         powerpc_excp(cpu, POWERPC_EXCP_SDOOR);
         break;
     case PPC_INTERRUPT_HDOORBELL:
-        env->pending_interrupts &= ~PPC_INTERRUPT_HDOORBELL;
+        if (!env->resume_as_sreset) {
+            env->pending_interrupts &= ~PPC_INTERRUPT_HDOORBELL;
+        }
         powerpc_excp(cpu, POWERPC_EXCP_SDOOR_HV);
         break;
     case PPC_INTERRUPT_PERFM: