[PATCH] target/i386/sev: Fix a segfault in sev_kvm_init

[Srikanth Aithal <srikanth.aithal@amd.com>]

Propogate error code using errp in sev_kvm_init.

Before fix:
qemu-system-x86_64: sev_kvm_init: guest policy requires SEV-ES,
but host SEV-ES support unavailable
27747 Segmentation fault      (core dumped)

After fix:
qemu-system-x86_64: sev_kvm_init: guest policy requires SEV-ES,
but host SEV-ES support unavailable
qemu-system-x86_64: failed to initialize kvm: Operation not permitted

While at it, also fix two more locations.

Reviewed-by: Nikunj A Dadhania <nikunj@amd.com>
Signed-off-by: Srikanth Aithal <srikanth.aithal@amd.com>
---
 target/i386/sev.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 9a71246682..c0a4d5e535 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -922,7 +922,8 @@ int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
 
     ret = ram_block_discard_disable(true);
     if (ret) {
-        error_report("%s: cannot disable RAM discard", __func__);
+        error_setg(errp, "%s: cannot disable "
+                     "RAM discard", __func__);
         return -1;
     }
 
@@ -979,13 +980,13 @@ int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
 
     if (sev_es_enabled()) {
         if (!kvm_kernel_irqchip_allowed()) {
-            error_report("%s: SEV-ES guests require in-kernel irqchip support",
-                         __func__);
+            error_setg(errp, "%s: SEV-ES guests require in-kernel "
+                         "irqchip support", __func__);
             goto err;
         }
 
         if (!(status.flags & SEV_STATUS_FLAGS_CONFIG_ES)) {
-            error_report("%s: guest policy requires SEV-ES, but "
+            error_setg(errp, "%s: guest policy requires SEV-ES, but "
                          "host SEV-ES support unavailable",
                          __func__);
             goto err;
-- 
2.34.1