[for-6.0 v5 09/13] securable guest memory: Move SEV initialization into arch specific code

[David Gibson <david@gibson.dropbear.id.au>]

While we've abstracted some (potential) differences between mechanisms for
securing guest memory, the initialization is still specific to SEV.  Given
that, move it into x86's kvm_arch_init() code, rather than the generic
kvm_init() code.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 accel/kvm/kvm-all.c | 14 --------------
 target/i386/kvm.c   | 12 ++++++++++++
 target/i386/sev.c   |  7 ++++++-
 3 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 724e9294d0..1b676da6c2 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2178,20 +2178,6 @@ static int kvm_init(MachineState *ms)
 
     kvm_state = s;
 
-    /*
-     * if memory encryption object is specified then initialize the memory
-     * encryption context.
-     */
-    if (ms->sgm) {
-        Error *local_err = NULL;
-        /* FIXME handle mechanisms other than SEV */
-        ret = sev_kvm_init(ms->sgm, &local_err);
-        if (ret < 0) {
-            error_report_err(local_err);
-            goto err;
-        }
-    }
-
     ret = kvm_arch_init(ms, s);
     if (ret < 0) {
         goto err;
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index a2934dda02..8e3617f3cd 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -42,6 +42,7 @@
 #include "hw/i386/intel_iommu.h"
 #include "hw/i386/x86-iommu.h"
 #include "hw/i386/e820_memory_layout.h"
+#include "sysemu/sev.h"
 
 #include "hw/pci/pci.h"
 #include "hw/pci/msi.h"
@@ -2110,6 +2111,17 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
     uint64_t shadow_mem;
     int ret;
     struct utsname utsname;
+    Error *local_err = NULL;
+
+    /*
+     * if memory encryption object is specified then initialize the
+     * memory encryption context (no-op otherwise)
+     */
+    ret = sev_kvm_init(ms->sgm, &local_err);
+    if (ret < 0) {
+        error_report_err(local_err);
+        return ret;
+    }
 
     if (!kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
         error_report("kvm: KVM_CAP_IRQ_ROUTING not supported by KVM");
diff --git a/target/i386/sev.c b/target/i386/sev.c
index 022ce5fc3a..8c19f4aea6 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -628,13 +628,18 @@ sev_vm_state_change(void *opaque, int running, RunState state)
 
 int sev_kvm_init(SecurableGuestMemory *sgm, Error **errp)
 {
-    SevGuestState *sev = SEV_GUEST(sgm);
+    SevGuestState *sev
+        = (SevGuestState *)object_dynamic_cast(OBJECT(sgm), TYPE_SEV_GUEST);
     char *devname;
     int ret, fw_error;
     uint32_t ebx;
     uint32_t host_cbitpos;
     struct sev_user_data_status status = {};
 
+    if (!sev) {
+        return 0;
+    }
+
     ret = ram_block_discard_disable(true);
     if (ret) {
         error_report("%s: cannot disable RAM discard", __func__);
-- 
2.28.0