[PATCH RFC 5/5] KVM: Hook kvm_arch_put_registers() errors to the caller

[Peter Xu <peterx@redhat.com>]

Leverage the new mechanism to pass over errors to upper stack for
kvm_arch_put_registers() when called for the post_init() accel hook.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 accel/kvm/kvm-all.c  | 13 ++++++++++---
 accel/kvm/kvm-cpus.h |  2 +-
 softmmu/cpus.c       |  5 ++++-
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 1caed1a295..71be723d24 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2761,15 +2761,22 @@ void kvm_cpu_synchronize_post_reset(CPUState *cpu)
     run_on_cpu(cpu, do_kvm_cpu_synchronize_post_reset, RUN_ON_CPU_NULL);
 }
 
-static void do_kvm_cpu_synchronize_post_init(CPUState *cpu, run_on_cpu_data arg)
+static void do_kvm_cpu_synchronize_post_init(CPUState *cpu, run_on_cpu_data arg,
+                                             Error **errp)
 {
-    kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
+    int ret = kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
+
+    if (ret) {
+        error_setg(errp, "kvm_arch_put_registers() failed with retval=%d", ret);
+        return;
+    }
+
     cpu->vcpu_dirty = false;
 }
 
 void kvm_cpu_synchronize_post_init(CPUState *cpu, Error **errp)
 {
-    run_on_cpu(cpu, do_kvm_cpu_synchronize_post_init, RUN_ON_CPU_NULL);
+    run_on_cpu2(cpu, do_kvm_cpu_synchronize_post_init, RUN_ON_CPU_NULL, errp);
 }
 
 static void do_kvm_cpu_synchronize_pre_loadvm(CPUState *cpu, run_on_cpu_data arg)
diff --git a/accel/kvm/kvm-cpus.h b/accel/kvm/kvm-cpus.h
index bf0bd1bee4..c9b8262704 100644
--- a/accel/kvm/kvm-cpus.h
+++ b/accel/kvm/kvm-cpus.h
@@ -16,7 +16,7 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp);
 int kvm_cpu_exec(CPUState *cpu);
 void kvm_destroy_vcpu(CPUState *cpu);
 void kvm_cpu_synchronize_post_reset(CPUState *cpu);
-void kvm_cpu_synchronize_post_init(CPUState *cpu);
+void kvm_cpu_synchronize_post_init(CPUState *cpu, Error **errp);
 void kvm_cpu_synchronize_pre_loadvm(CPUState *cpu);
 
 #endif /* KVM_CPUS_H */
diff --git a/softmmu/cpus.c b/softmmu/cpus.c
index 59c70fd496..6c0b5b87f0 100644
--- a/softmmu/cpus.c
+++ b/softmmu/cpus.c
@@ -151,7 +151,10 @@ void cpu_synchronize_all_post_init(Error **errp)
     CPUState *cpu;
 
     CPU_FOREACH(cpu) {
-        cpu_synchronize_post_init(cpu);
+        cpu_synchronize_post_init_full(cpu, errp);
+        if (errp && *errp) {
+            break;
+        }
     }
 }
 
-- 
2.32.0