[for-6.0 v5 07/13] sev: Add Error ** to sev_kvm_init()

[David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>]

This allows failures to be reported richly and idiomatically.

Signed-off-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
Reviewed-by: Richard Henderson <richard.henderson@xxxxxxxxxx>
---
 accel/kvm/kvm-all.c  |  4 +++-
 accel/kvm/sev-stub.c |  5 +++--
 include/sysemu/sev.h |  2 +-
 target/i386/sev.c    | 31 +++++++++++++++----------------
 4 files changed, 22 insertions(+), 20 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index c6bd7b9d02..724e9294d0 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2183,9 +2183,11 @@ static int kvm_init(MachineState *ms)
      * encryption context.
      */
     if (ms->sgm) {
+        Error *local_err = NULL;
         /* FIXME handle mechanisms other than SEV */
-        ret = sev_kvm_init(ms->sgm);
+        ret = sev_kvm_init(ms->sgm, &local_err);
         if (ret < 0) {
+            error_report_err(local_err);
             goto err;
         }
     }
diff --git a/accel/kvm/sev-stub.c b/accel/kvm/sev-stub.c
index 3df3c88eeb..537c91d9f8 100644
--- a/accel/kvm/sev-stub.c
+++ b/accel/kvm/sev-stub.c
@@ -15,7 +15,8 @@
 #include "qemu-common.h"
 #include "sysemu/sev.h"
 
-int sev_kvm_init(SecurableGuestMemory *sgm)
+int sev_kvm_init(SecurableGuestMemory *sgm, Error **errp)
 {
-    return -1;
+    /* SEV can't be selected if it's not compiled */
+    g_assert_not_reached();
 }
diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
index 36d038a36f..7aa35821f0 100644
--- a/include/sysemu/sev.h
+++ b/include/sysemu/sev.h
@@ -17,6 +17,6 @@
 #include "sysemu/kvm.h"
 #include "exec/securable-guest-memory.h"
 
-int sev_kvm_init(SecurableGuestMemory *sgm);
+int sev_kvm_init(SecurableGuestMemory *sgm, Error **errp);
 
 #endif
diff --git a/target/i386/sev.c b/target/i386/sev.c
index 7b8ce590f7..7333a60dc0 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -626,7 +626,7 @@ sev_vm_state_change(void *opaque, int running, RunState state)
     }
 }
 
-int sev_kvm_init(SecurableGuestMemory *sgm)
+int sev_kvm_init(SecurableGuestMemory *sgm, Error **errp)
 {
     SevGuestState *sev = SEV_GUEST(sgm);
     char *devname;
@@ -648,14 +648,14 @@ int sev_kvm_init(SecurableGuestMemory *sgm)
     host_cbitpos = ebx & 0x3f;
 
     if (host_cbitpos != sev->cbitpos) {
-        error_report("%s: cbitpos check failed, host '%d' requested '%d'",
-                     __func__, host_cbitpos, sev->cbitpos);
+        error_setg(errp, "%s: cbitpos check failed, host '%d' requested '%d'",
+                   __func__, host_cbitpos, sev->cbitpos);
         goto err;
     }
 
     if (sev->reduced_phys_bits < 1) {
-        error_report("%s: reduced_phys_bits check failed, it should be >=1,"
-                     " requested '%d'", __func__, sev->reduced_phys_bits);
+        error_setg(errp, "%s: reduced_phys_bits check failed, it should be >=1,"
+                   " requested '%d'", __func__, sev->reduced_phys_bits);
         goto err;
     }
 
@@ -664,20 +664,19 @@ int sev_kvm_init(SecurableGuestMemory *sgm)
     devname = object_property_get_str(OBJECT(sev), "sev-device", NULL);
     sev->sev_fd = open(devname, O_RDWR);
     if (sev->sev_fd < 0) {
-        error_report("%s: Failed to open %s '%s'", __func__,
-                     devname, strerror(errno));
-    }
-    g_free(devname);
-    if (sev->sev_fd < 0) {
+        error_setg(errp, "%s: Failed to open %s '%s'", __func__,
+                   devname, strerror(errno));
+        g_free(devname);
         goto err;
     }
+    g_free(devname);
 
     ret = sev_platform_ioctl(sev->sev_fd, SEV_PLATFORM_STATUS, &status,
                              &fw_error);
     if (ret) {
-        error_report("%s: failed to get platform status ret=%d "
-                     "fw_error='%d: %s'", __func__, ret, fw_error,
-                     fw_error_to_str(fw_error));
+        error_setg(errp, "%s: failed to get platform status ret=%d "
+                   "fw_error='%d: %s'", __func__, ret, fw_error,
+                   fw_error_to_str(fw_error));
         goto err;
     }
     sev->build_id = status.build;
@@ -687,14 +686,14 @@ int sev_kvm_init(SecurableGuestMemory *sgm)
     trace_kvm_sev_init();
     ret = sev_ioctl(sev->sev_fd, KVM_SEV_INIT, NULL, &fw_error);
     if (ret) {
-        error_report("%s: failed to initialize ret=%d fw_error=%d '%s'",
-                     __func__, ret, fw_error, fw_error_to_str(fw_error));
+        error_setg(errp, "%s: failed to initialize ret=%d fw_error=%d '%s'",
+                   __func__, ret, fw_error, fw_error_to_str(fw_error));
         goto err;
     }
 
     ret = sev_launch_start(sev);
     if (ret) {
-        error_report("%s: failed to create encryption context", __func__);
+        error_setg(errp, "%s: failed to create encryption context", __func__);
         goto err;
     }
 
-- 
2.28.0