[Qemu-devel] [PATCH v14 02/11] qemu_thread: supplement error handling for qemu_X_start_vcpu

[Fei Li]

From: Fei Li <address@hidden>

The callers of qemu_init_vcpu() already passed the **errp to handle
errors. In view of this, add a new Error parameter to qemu_init_vcpu()
and all qemu_X_start_vcpu() functions called by qemu_init_vcpu() to
propagate the error and let the further callers check it.

Besides, make qemu_init_vcpu() return a Boolean value to let its
callers know whether it succeeds.

Cc: Paolo Bonzini <address@hidden>
Signed-off-by: Fei Li <address@hidden>
Reviewed-by: Fam Zheng <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
Reviewed-by: Markus Armbruster <address@hidden>
ppc parts:
Acked-by: David Gibson <address@hidden>
---
 accel/tcg/user-exec-stub.c      |  3 +-
 cpus.c                          | 74 +++++++++++++++++++++++------------------
 include/qom/cpu.h               |  2 +-
 target/alpha/cpu.c              |  4 ++-
 target/arm/cpu.c                |  4 ++-
 target/cris/cpu.c               |  4 ++-
 target/hppa/cpu.c               |  4 ++-
 target/i386/cpu.c               |  4 ++-
 target/lm32/cpu.c               |  4 ++-
 target/m68k/cpu.c               |  4 ++-
 target/microblaze/cpu.c         |  4 ++-
 target/mips/cpu.c               |  4 ++-
 target/moxie/cpu.c              |  4 ++-
 target/nios2/cpu.c              |  4 ++-
 target/openrisc/cpu.c           |  4 ++-
 target/ppc/translate_init.inc.c |  4 ++-
 target/riscv/cpu.c              |  4 ++-
 target/s390x/cpu.c              |  4 ++-
 target/sh4/cpu.c                |  4 ++-
 target/sparc/cpu.c              |  4 ++-
 target/tilegx/cpu.c             |  4 ++-
 target/tricore/cpu.c            |  4 ++-
 target/unicore32/cpu.c          |  4 ++-
 target/xtensa/cpu.c             |  4 ++-
 24 files changed, 108 insertions(+), 55 deletions(-)

diff --git a/accel/tcg/user-exec-stub.c b/accel/tcg/user-exec-stub.c
index 4bf00b8496..215bd9eead 100644
--- a/accel/tcg/user-exec-stub.c
+++ b/accel/tcg/user-exec-stub.c
@@ -9,8 +9,9 @@ void cpu_resume(CPUState *cpu)
 {
 }
 
-void qemu_init_vcpu(CPUState *cpu)
+bool qemu_init_vcpu(CPUState *cpu, Error **errp)
 {
+    return true;
 }
 
 /* User mode emulation does not support record/replay yet.  */
diff --git a/cpus.c b/cpus.c
index 28a241a936..c913bdc29e 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1941,7 +1941,7 @@ void cpu_remove_sync(CPUState *cpu)
 /* For temporary buffers for forming a name */
 #define VCPU_THREAD_NAME_SIZE 16
 
-static void qemu_tcg_init_vcpu(CPUState *cpu)
+static void qemu_tcg_init_vcpu(CPUState *cpu, Error **errp)
 {
     char thread_name[VCPU_THREAD_NAME_SIZE];
     static QemuCond *single_tcg_halt_cond;
@@ -1971,17 +1971,20 @@ static void qemu_tcg_init_vcpu(CPUState *cpu)
             snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG",
                  cpu->cpu_index);
 
-            /* TODO: let the callers handle the error instead of abort() here 
*/
-            qemu_thread_create(cpu->thread, thread_name, 
qemu_tcg_cpu_thread_fn,
-                               cpu, QEMU_THREAD_JOINABLE, &error_abort);
+            if (qemu_thread_create(cpu->thread, thread_name,
+                                   qemu_tcg_cpu_thread_fn, cpu,
+                                   QEMU_THREAD_JOINABLE, errp) < 0) {
+                return;
+            }
 
         } else {
             /* share a single thread for all cpus with TCG */
             snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG");
-            /* TODO: let the callers handle the error instead of abort() here 
*/
-            qemu_thread_create(cpu->thread, thread_name,
-                               qemu_tcg_rr_cpu_thread_fn,
-                               cpu, QEMU_THREAD_JOINABLE, &error_abort);
+            if (qemu_thread_create(cpu->thread, thread_name,
+                                   qemu_tcg_rr_cpu_thread_fn, cpu,
+                                   QEMU_THREAD_JOINABLE, errp) < 0) {
+                return;
+            }
 
             single_tcg_halt_cond = cpu->halt_cond;
             single_tcg_cpu_thread = cpu->thread;
@@ -1999,7 +2002,7 @@ static void qemu_tcg_init_vcpu(CPUState *cpu)
     }
 }
 
-static void qemu_hax_start_vcpu(CPUState *cpu)
+static void qemu_hax_start_vcpu(CPUState *cpu, Error **errp)
 {
     char thread_name[VCPU_THREAD_NAME_SIZE];
 
@@ -2009,15 +2012,16 @@ static void qemu_hax_start_vcpu(CPUState *cpu)
 
     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/HAX",
              cpu->cpu_index);
-    /* TODO: let the further caller handle the error instead of abort() here */
-    qemu_thread_create(cpu->thread, thread_name, qemu_hax_cpu_thread_fn,
-                       cpu, QEMU_THREAD_JOINABLE, &error_abort);
+    if (qemu_thread_create(cpu->thread, thread_name, qemu_hax_cpu_thread_fn,
+                           cpu, QEMU_THREAD_JOINABLE, errp) < 0) {
+        return;
+    }
 #ifdef _WIN32
     cpu->hThread = qemu_thread_get_handle(cpu->thread);
 #endif
 }
 
-static void qemu_kvm_start_vcpu(CPUState *cpu)
+static void qemu_kvm_start_vcpu(CPUState *cpu, Error **errp)
 {
     char thread_name[VCPU_THREAD_NAME_SIZE];
 
@@ -2026,12 +2030,11 @@ static void qemu_kvm_start_vcpu(CPUState *cpu)
     qemu_cond_init(cpu->halt_cond);
     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM",
              cpu->cpu_index);
-    /* TODO: let the further caller handle the error instead of abort() here */
     qemu_thread_create(cpu->thread, thread_name, qemu_kvm_cpu_thread_fn,
-                       cpu, QEMU_THREAD_JOINABLE, &error_abort);
+                       cpu, QEMU_THREAD_JOINABLE, errp);
 }
 
-static void qemu_hvf_start_vcpu(CPUState *cpu)
+static void qemu_hvf_start_vcpu(CPUState *cpu, Error **errp)
 {
     char thread_name[VCPU_THREAD_NAME_SIZE];
 
@@ -2045,12 +2048,11 @@ static void qemu_hvf_start_vcpu(CPUState *cpu)
 
     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/HVF",
              cpu->cpu_index);
-    /* TODO: let the further caller handle the error instead of abort() here */
     qemu_thread_create(cpu->thread, thread_name, qemu_hvf_cpu_thread_fn,
-                       cpu, QEMU_THREAD_JOINABLE, &error_abort);
+                       cpu, QEMU_THREAD_JOINABLE, errp);
 }
 
-static void qemu_whpx_start_vcpu(CPUState *cpu)
+static void qemu_whpx_start_vcpu(CPUState *cpu, Error **errp)
 {
     char thread_name[VCPU_THREAD_NAME_SIZE];
 
@@ -2059,15 +2061,16 @@ static void qemu_whpx_start_vcpu(CPUState *cpu)
     qemu_cond_init(cpu->halt_cond);
     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/WHPX",
              cpu->cpu_index);
-    /* TODO: let the further caller handle the error instead of abort() here */
-    qemu_thread_create(cpu->thread, thread_name, qemu_whpx_cpu_thread_fn,
-                       cpu, QEMU_THREAD_JOINABLE, &error_abort);
+    if (qemu_thread_create(cpu->thread, thread_name, qemu_whpx_cpu_thread_fn,
+                           cpu, QEMU_THREAD_JOINABLE, errp) < 0) {
+        return;
+    }
 #ifdef _WIN32
     cpu->hThread = qemu_thread_get_handle(cpu->thread);
 #endif
 }
 
-static void qemu_dummy_start_vcpu(CPUState *cpu)
+static void qemu_dummy_start_vcpu(CPUState *cpu, Error **errp)
 {
     char thread_name[VCPU_THREAD_NAME_SIZE];
 
@@ -2076,12 +2079,11 @@ static void qemu_dummy_start_vcpu(CPUState *cpu)
     qemu_cond_init(cpu->halt_cond);
     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
              cpu->cpu_index);
-    /* TODO: let the further caller handle the error instead of abort() here */
     qemu_thread_create(cpu->thread, thread_name, qemu_dummy_cpu_thread_fn,
-                       cpu, QEMU_THREAD_JOINABLE, &error_abort);
+                       cpu, QEMU_THREAD_JOINABLE, errp);
 }
 
-void qemu_init_vcpu(CPUState *cpu)
+bool qemu_init_vcpu(CPUState *cpu, Error **errp)
 {
     MachineState *ms = MACHINE(qdev_get_machine());
 
@@ -2089,6 +2091,7 @@ void qemu_init_vcpu(CPUState *cpu)
     cpu->nr_threads =  ms->smp.threads;
     cpu->stopped = true;
     cpu->random_seed = qemu_guest_random_seed_thread_part1();
+    Error *local_err = NULL;
 
     if (!cpu->as) {
         /* If the target cpu hasn't set up any address spaces itself,
@@ -2099,22 +2102,29 @@ void qemu_init_vcpu(CPUState *cpu)
     }
 
     if (kvm_enabled()) {
-        qemu_kvm_start_vcpu(cpu);
+        qemu_kvm_start_vcpu(cpu, &local_err);
     } else if (hax_enabled()) {
-        qemu_hax_start_vcpu(cpu);
+        qemu_hax_start_vcpu(cpu, &local_err);
     } else if (hvf_enabled()) {
-        qemu_hvf_start_vcpu(cpu);
+        qemu_hvf_start_vcpu(cpu, &local_err);
     } else if (tcg_enabled()) {
-        qemu_tcg_init_vcpu(cpu);
+        qemu_tcg_init_vcpu(cpu, &local_err);
     } else if (whpx_enabled()) {
-        qemu_whpx_start_vcpu(cpu);
+        qemu_whpx_start_vcpu(cpu, &local_err);
     } else {
-        qemu_dummy_start_vcpu(cpu);
+        qemu_dummy_start_vcpu(cpu, &local_err);
+    }
+
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return false;
     }
 
     while (!cpu->created) {
         qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
     }
+
+    return true;
 }
 
 void cpu_stop_current(void)
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 5ee0046b62..37f2d3dad5 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -1021,7 +1021,7 @@ void end_exclusive(void);
  *
  * Initializes a vCPU.
  */
-void qemu_init_vcpu(CPUState *cpu);
+bool qemu_init_vcpu(CPUState *cpu, Error **errp);
 
 #define SSTEP_ENABLE  0x1  /* Enable simulated HW single stepping */
 #define SSTEP_NOIRQ   0x2  /* Do not use IRQ while single stepping */
diff --git a/target/alpha/cpu.c b/target/alpha/cpu.c
index b3fd6643e8..84c9b517c8 100644
--- a/target/alpha/cpu.c
+++ b/target/alpha/cpu.c
@@ -66,7 +66,9 @@ static void alpha_cpu_realizefn(DeviceState *dev, Error 
**errp)
         return;
     }
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     acc->parent_realize(dev, errp);
 }
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 1959467fdc..8b9c186780 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -1610,7 +1610,9 @@ static void arm_cpu_realizefn(DeviceState *dev, Error 
**errp)
     }
 #endif
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
     cpu_reset(cs);
 
     acc->parent_realize(dev, errp);
diff --git a/target/cris/cpu.c b/target/cris/cpu.c
index 7adfd6caf4..229928ae72 100644
--- a/target/cris/cpu.c
+++ b/target/cris/cpu.c
@@ -135,7 +135,9 @@ static void cris_cpu_realizefn(DeviceState *dev, Error 
**errp)
     }
 
     cpu_reset(cs);
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     ccc->parent_realize(dev, errp);
 }
diff --git a/target/hppa/cpu.c b/target/hppa/cpu.c
index 71b6aca45d..11837dc4f9 100644
--- a/target/hppa/cpu.c
+++ b/target/hppa/cpu.c
@@ -99,7 +99,9 @@ static void hppa_cpu_realizefn(DeviceState *dev, Error **errp)
         return;
     }
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
     acc->parent_realize(dev, errp);
 
 #ifndef CONFIG_USER_ONLY
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 805ce95247..004910ab93 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -5377,7 +5377,9 @@ static void x86_cpu_realizefn(DeviceState *dev, Error 
**errp)
     }
 #endif
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     /*
      * Most Intel and certain AMD CPUs support hyperthreading. Even though QEMU
diff --git a/target/lm32/cpu.c b/target/lm32/cpu.c
index b35537de62..503b75b32b 100644
--- a/target/lm32/cpu.c
+++ b/target/lm32/cpu.c
@@ -134,7 +134,9 @@ static void lm32_cpu_realizefn(DeviceState *dev, Error 
**errp)
 
     cpu_reset(cs);
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     lcc->parent_realize(dev, errp);
 }
diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
index e6596de29c..28b28cfb5c 100644
--- a/target/m68k/cpu.c
+++ b/target/m68k/cpu.c
@@ -232,7 +232,9 @@ static void m68k_cpu_realizefn(DeviceState *dev, Error 
**errp)
     m68k_cpu_init_gdb(cpu);
 
     cpu_reset(cs);
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     mcc->parent_realize(dev, errp);
 }
diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
index 0bec54b2f8..610bff082d 100644
--- a/target/microblaze/cpu.c
+++ b/target/microblaze/cpu.c
@@ -161,7 +161,9 @@ static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
         return;
     }
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     env->pvr.regs[0] = PVR0_USE_EXC_MASK \
                        | PVR0_USE_ICACHE_MASK \
diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index 39eafafc5c..0b3aeba140 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -145,7 +145,9 @@ static void mips_cpu_realizefn(DeviceState *dev, Error 
**errp)
     cpu_mips_realize_env(&cpu->env);
 
     cpu_reset(cs);
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     mcc->parent_realize(dev, errp);
 }
diff --git a/target/moxie/cpu.c b/target/moxie/cpu.c
index 48996d0554..bb2df19a08 100644
--- a/target/moxie/cpu.c
+++ b/target/moxie/cpu.c
@@ -65,7 +65,9 @@ static void moxie_cpu_realizefn(DeviceState *dev, Error 
**errp)
         return;
     }
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
     cpu_reset(cs);
 
     mcc->parent_realize(dev, errp);
diff --git a/target/nios2/cpu.c b/target/nios2/cpu.c
index ca9c7a6df5..2b5091071c 100644
--- a/target/nios2/cpu.c
+++ b/target/nios2/cpu.c
@@ -92,7 +92,9 @@ static void nios2_cpu_realizefn(DeviceState *dev, Error 
**errp)
         return;
     }
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
     cpu_reset(cs);
 
     ncc->parent_realize(dev, errp);
diff --git a/target/openrisc/cpu.c b/target/openrisc/cpu.c
index f19e482a55..28d448396b 100644
--- a/target/openrisc/cpu.c
+++ b/target/openrisc/cpu.c
@@ -83,7 +83,9 @@ static void openrisc_cpu_realizefn(DeviceState *dev, Error 
**errp)
         return;
     }
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
     cpu_reset(cs);
 
     occ->parent_realize(dev, errp);
diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c
index 86fc8f2e31..63a75dc115 100644
--- a/target/ppc/translate_init.inc.c
+++ b/target/ppc/translate_init.inc.c
@@ -9843,7 +9843,9 @@ static void ppc_cpu_realize(DeviceState *dev, Error 
**errp)
     gdb_register_coprocessor(cs, gdb_get_spr_reg, gdb_set_spr_reg,
                              pcc->gdb_num_sprs, "power-spr.xml", 0);
 #endif
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        goto unrealize;
+    }
 
     pcc->parent_realize(dev, errp);
 
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index f8d07bd20a..24fa555db7 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -412,7 +412,9 @@ static void riscv_cpu_realize(DeviceState *dev, Error 
**errp)
 
     riscv_cpu_register_gdb_regs_for_features(cs);
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
     cpu_reset(cs);
 
     mcc->parent_realize(dev, errp);
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 736a7903e2..98ffd2767c 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -226,7 +226,9 @@ static void s390_cpu_realizefn(DeviceState *dev, Error 
**errp)
     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 #endif
     s390_cpu_gdb_init(cs);
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     /*
      * KVM requires the initial CPU reset ioctl to be executed on the target
diff --git a/target/sh4/cpu.c b/target/sh4/cpu.c
index 816d6d7f31..dc67833e3a 100644
--- a/target/sh4/cpu.c
+++ b/target/sh4/cpu.c
@@ -186,7 +186,9 @@ static void superh_cpu_realizefn(DeviceState *dev, Error 
**errp)
     }
 
     cpu_reset(cs);
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     scc->parent_realize(dev, errp);
 }
diff --git a/target/sparc/cpu.c b/target/sparc/cpu.c
index ee60a5536a..1a584b3404 100644
--- a/target/sparc/cpu.c
+++ b/target/sparc/cpu.c
@@ -768,7 +768,9 @@ static void sparc_cpu_realizefn(DeviceState *dev, Error 
**errp)
         return;
     }
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     scc->parent_realize(dev, errp);
 }
diff --git a/target/tilegx/cpu.c b/target/tilegx/cpu.c
index 69971247f2..750b6fd110 100644
--- a/target/tilegx/cpu.c
+++ b/target/tilegx/cpu.c
@@ -93,7 +93,9 @@ static void tilegx_cpu_realizefn(DeviceState *dev, Error 
**errp)
     }
 
     cpu_reset(cs);
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     tcc->parent_realize(dev, errp);
 }
diff --git a/target/tricore/cpu.c b/target/tricore/cpu.c
index df807c1d74..1d0853c3f4 100644
--- a/target/tricore/cpu.c
+++ b/target/tricore/cpu.c
@@ -95,7 +95,9 @@ static void tricore_cpu_realizefn(DeviceState *dev, Error 
**errp)
         set_feature(env, TRICORE_FEATURE_13);
     }
     cpu_reset(cs);
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     tcc->parent_realize(dev, errp);
 }
diff --git a/target/unicore32/cpu.c b/target/unicore32/cpu.c
index 802e2f1eba..4a3da5f900 100644
--- a/target/unicore32/cpu.c
+++ b/target/unicore32/cpu.c
@@ -95,7 +95,9 @@ static void uc32_cpu_realizefn(DeviceState *dev, Error **errp)
         return;
     }
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     ucc->parent_realize(dev, errp);
 }
diff --git a/target/xtensa/cpu.c b/target/xtensa/cpu.c
index 76db1741a7..46a15f0df5 100644
--- a/target/xtensa/cpu.c
+++ b/target/xtensa/cpu.c
@@ -131,7 +131,9 @@ static void xtensa_cpu_realizefn(DeviceState *dev, Error 
**errp)
 
     cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs;
 
-    qemu_init_vcpu(cs);
+    if (!qemu_init_vcpu(cs, errp)) {
+        return;
+    }
 
     xcc->parent_realize(dev, errp);
 }
-- 
2.11.0