kvm: Allow kvm_arch_get/put_registers to accept Error**

This is necessary to provide discernible error messages to the caller.

Signed-off-by: Julia Suvorova <jusual@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240927104743.218468-2-jusual@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 32 insertions, 9 deletions

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index e57492fda5..905fb844e4 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2793,9 +2793,15 @@ void kvm_flush_coalesced_mmio_buffer(void)
 static void do_kvm_cpu_synchronize_state(CPUState *cpu, run_on_cpu_data arg)
 {
     if (!cpu->vcpu_dirty && !kvm_state->guest_state_protected) {
-        int ret = kvm_arch_get_registers(cpu);
+        Error *err = NULL;
+        int ret = kvm_arch_get_registers(cpu, &err);
         if (ret) {
-            error_report("Failed to get registers: %s", strerror(-ret));
+            if (err) {
+                error_reportf_err(err, "Failed to synchronize CPU state: ");
+            } else {
+                error_report("Failed to get registers: %s", strerror(-ret));
+            }
+
             cpu_dump_state(cpu, stderr, CPU_DUMP_CODE);
             vm_stop(RUN_STATE_INTERNAL_ERROR);
         }
@@ -2813,9 +2819,15 @@ void kvm_cpu_synchronize_state(CPUState *cpu)
 
 static void do_kvm_cpu_synchronize_post_reset(CPUState *cpu, run_on_cpu_data arg)
 {
-    int ret = kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE);
+    Error *err = NULL;
+    int ret = kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE, &err);
     if (ret) {
-        error_report("Failed to put registers after reset: %s", strerror(-ret));
+        if (err) {
+            error_reportf_err(err, "Restoring resisters after reset: ");
+        } else {
+            error_report("Failed to put registers after reset: %s",
+                         strerror(-ret));
+        }
         cpu_dump_state(cpu, stderr, CPU_DUMP_CODE);
         vm_stop(RUN_STATE_INTERNAL_ERROR);
     }
@@ -2830,9 +2842,15 @@ void kvm_cpu_synchronize_post_reset(CPUState *cpu)
 
 static void do_kvm_cpu_synchronize_post_init(CPUState *cpu, run_on_cpu_data arg)
 {
-    int ret = kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
+    Error *err = NULL;
+    int ret = kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE, &err);
     if (ret) {
-        error_report("Failed to put registers after init: %s", strerror(-ret));
+        if (err) {
+            error_reportf_err(err, "Putting registers after init: ");
+        } else {
+            error_report("Failed to put registers after init: %s",
+                         strerror(-ret));
+        }
         exit(1);
     }
 
@@ -3022,10 +3040,15 @@ int kvm_cpu_exec(CPUState *cpu)
         MemTxAttrs attrs;
 
         if (cpu->vcpu_dirty) {
-            ret = kvm_arch_put_registers(cpu, KVM_PUT_RUNTIME_STATE);
+            Error *err = NULL;
+            ret = kvm_arch_put_registers(cpu, KVM_PUT_RUNTIME_STATE, &err);
             if (ret) {
-                error_report("Failed to put registers after init: %s",
-                             strerror(-ret));
+                if (err) {
+                    error_reportf_err(err, "Putting registers after init: ");
+                } else {
+                    error_report("Failed to put registers after init: %s",
+                                 strerror(-ret));
+                }
                 ret = -1;
                 break;
             }