[PATCH v5 4/6] accel/kvm: Use negative KVM type for error propagation

[Akihiko Odaki <akihiko.odaki@xxxxxxxxxx>]

On MIPS, kvm_arch_get_default_type() returns a negative value when an
error occurred so handle the case. Also, let other machines return
negative values when errors occur and declare returning a negative
value as the correct way to propagate an error that happened when
determining KVM type.

Signed-off-by: Akihiko Odaki <akihiko.odaki@xxxxxxxxxx>
---
 accel/kvm/kvm-all.c | 5 +++++
 hw/arm/virt.c       | 2 +-
 hw/ppc/spapr.c      | 2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index d591b5079c..94a62efa3c 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2527,6 +2527,11 @@ static int kvm_init(MachineState *ms)
         type = kvm_arch_get_default_type(ms);
     }
 
+    if (type < 0) {
+        ret = -EINVAL;
+        goto err;
+    }
+
     do {
         ret = kvm_ioctl(s, KVM_CREATE_VM, type);
     } while (ret == -EINTR);
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 8a4c663735..161f3ffbf7 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2977,7 +2977,7 @@ static int virt_kvm_type(MachineState *ms, const char *type_str)
                      "require an IPA range (%d bits) larger than "
                      "the one supported by the host (%d bits)",
                      requested_pa_size, max_vm_pa_size);
-        exit(1);
+        return -1;
     }
     /*
      * We return the requested PA log size, unless KVM only supports
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 54dbfd7fe9..1b522e8e40 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -3104,7 +3104,7 @@ static int spapr_kvm_type(MachineState *machine, const char *vm_type)
     }
 
     error_report("Unknown kvm-type specified '%s'", vm_type);
-    exit(1);
+    return -1;
 }
 
 /*
-- 
2.41.0