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Re: [RFC PATCH 2/4] i386/sev: Switch to use confidential_guest_kvm_init(

From: Xiaoyao Li
Subject: Re: [RFC PATCH 2/4] i386/sev: Switch to use confidential_guest_kvm_init()
Date: Wed, 7 Feb 2024 15:10:43 +0800
User-agent: Mozilla Thunderbird 
On 2/6/2024 10:16 PM, Daniel P. Berrangé wrote:

On Tue, Feb 06, 2024 at 03:28:50AM -0500, Xiaoyao Li wrote:

Use confidential_guest_kvm_init() instead of calling SEV specific
sev_kvm_init(). As a bouns, it fits to future TDX when TDX implements
its own confidential_guest_support and .kvm_init().

Move the "TypeInfo sev_guest_info" definition and related functions to
the end of the file, to avoid declaring the sev_kvm_init() ahead.

Clean up the sve-stub.c since it's not needed anymore.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
  target/i386/kvm/kvm.c       |   2 +-
  target/i386/kvm/meson.build |   2 -
  target/i386/kvm/sev-stub.c  |   5 --
  target/i386/sev.c           | 120 +++++++++++++++++++-----------------
  target/i386/sev.h           |   2 -
  5 files changed, 63 insertions(+), 68 deletions(-)

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 76a66246eb72..bb63bba61fa1 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -2534,7 +2534,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
       * mechanisms are supported in future (e.g. TDX), they'll need
       * their own initialization either here or elsewhere.
       */
-    ret = sev_kvm_init(ms->cgs, &local_err);
+    ret = confidential_guest_kvm_init(ms->cgs, &local_err);


If you agree with my comment in patch 1 about the API expecting non-NULL,
then this would need to be conditionalized (same for the 2 following
patches too)


sure. Will change.


    if (ms->cgs) {
       ret = confidential_guest_kvm_init(....)
       if (ret < 0) {
          ....
       }
    }


      if (ret < 0) {
          error_report_err(local_err);
          return ret;
diff --git a/target/i386/kvm/meson.build b/target/i386/kvm/meson.build
index 84d9143e6029..e7850981e62d 100644
--- a/target/i386/kvm/meson.build
+++ b/target/i386/kvm/meson.build
@@ -7,8 +7,6 @@ i386_kvm_ss.add(files(
i386_kvm_ss.add(when: 'CONFIG_XEN_EMU', if_true: files('xen-emu.c')) -i386_kvm_ss.add(when: 'CONFIG_SEV', if_false: files('sev-stub.c')) 
-
  i386_system_ss.add(when: 'CONFIG_HYPERV', if_true: files('hyperv.c'), 
if_false: files('hyperv-stub.c'))
i386_system_ss.add_all(when: 'CONFIG_KVM', if_true: i386_kvm_ss) 
diff --git a/target/i386/kvm/sev-stub.c b/target/i386/kvm/sev-stub.c
index 1be5341e8a6a..4a1560cf8ad7 100644
--- a/target/i386/kvm/sev-stub.c
+++ b/target/i386/kvm/sev-stub.c
@@ -14,8 +14,3 @@
  #include "qemu/osdep.h"
  #include "sev.h"
-int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp) 
-{
-    /* If we get here, cgs must be some non-SEV thing */
-    return 0;
-}


You can actually delete this entire file, since you removed the
only method in it, and stopped building it in the meson.build
patch above.
I intented to do it. Apprarently I missed it somehow and didn't catch it before sending out. 

will fix in next version.


diff --git a/target/i386/sev.c b/target/i386/sev.c
index 173de91afe7d..19e79d3631d0 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -353,63 +353,6 @@ static void sev_guest_set_kernel_hashes(Object *obj, bool 
value, Error **errp)
      sev->kernel_hashes = value;
  }
-static void 
-sev_guest_class_init(ObjectClass *oc, void *data)
-{
-    object_class_property_add_str(oc, "sev-device",
-                                  sev_guest_get_sev_device,
-                                  sev_guest_set_sev_device);
-    object_class_property_set_description(oc, "sev-device",
-            "SEV device to use");
-    object_class_property_add_str(oc, "dh-cert-file",
-                                  sev_guest_get_dh_cert_file,
-                                  sev_guest_set_dh_cert_file);
-    object_class_property_set_description(oc, "dh-cert-file",
-            "guest owners DH certificate (encoded with base64)");
-    object_class_property_add_str(oc, "session-file",
-                                  sev_guest_get_session_file,
-                                  sev_guest_set_session_file);
-    object_class_property_set_description(oc, "session-file",
-            "guest owners session parameters (encoded with base64)");
-    object_class_property_add_bool(oc, "kernel-hashes",
-                                   sev_guest_get_kernel_hashes,
-                                   sev_guest_set_kernel_hashes);
-    object_class_property_set_description(oc, "kernel-hashes",
-            "add kernel hashes to guest firmware for measured Linux boot");
-}
-
-static void
-sev_guest_instance_init(Object *obj)
-{
-    SevGuestState *sev = SEV_GUEST(obj);
-
-    sev->sev_device = g_strdup(DEFAULT_SEV_DEVICE);
-    sev->policy = DEFAULT_GUEST_POLICY;
-    object_property_add_uint32_ptr(obj, "policy", &sev->policy,
-                                   OBJ_PROP_FLAG_READWRITE);
-    object_property_add_uint32_ptr(obj, "handle", &sev->handle,
-                                   OBJ_PROP_FLAG_READWRITE);
-    object_property_add_uint32_ptr(obj, "cbitpos", &sev->cbitpos,
-                                   OBJ_PROP_FLAG_READWRITE);
-    object_property_add_uint32_ptr(obj, "reduced-phys-bits",
-                                   &sev->reduced_phys_bits,
-                                   OBJ_PROP_FLAG_READWRITE);
-}
-
-/* sev guest info */
-static const TypeInfo sev_guest_info = {
-    .parent = TYPE_CONFIDENTIAL_GUEST_SUPPORT,
-    .name = TYPE_SEV_GUEST,
-    .instance_size = sizeof(SevGuestState),
-    .instance_finalize = sev_guest_finalize,
-    .class_init = sev_guest_class_init,
-    .instance_init = sev_guest_instance_init,
-    .interfaces = (InterfaceInfo[]) {
-        { TYPE_USER_CREATABLE },
-        { }
-    }
-};
-
  bool
  sev_enabled(void)
  {
@@ -906,7 +849,7 @@ sev_vm_state_change(void *opaque, bool running, RunState 
state)
      }
  }
-int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp) 
+static int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
  {
      SevGuestState *sev
          = (SevGuestState *)object_dynamic_cast(OBJECT(cgs), TYPE_SEV_GUEST);
@@ -1383,6 +1326,67 @@ bool sev_add_kernel_loader_hashes(SevKernelLoaderContext 
*ctx, Error **errp)
      return ret;
  }
+static void 
+sev_guest_class_init(ObjectClass *oc, void *data)
+{
+    ConfidentialGuestSupportClass *klass = 
CONFIDENTIAL_GUEST_SUPPORT_CLASS(oc);
+
+    klass->kvm_init = sev_kvm_init;
+
+    object_class_property_add_str(oc, "sev-device",
+                                  sev_guest_get_sev_device,
+                                  sev_guest_set_sev_device);
+    object_class_property_set_description(oc, "sev-device",
+            "SEV device to use");
+    object_class_property_add_str(oc, "dh-cert-file",
+                                  sev_guest_get_dh_cert_file,
+                                  sev_guest_set_dh_cert_file);
+    object_class_property_set_description(oc, "dh-cert-file",
+            "guest owners DH certificate (encoded with base64)");
+    object_class_property_add_str(oc, "session-file",
+                                  sev_guest_get_session_file,
+                                  sev_guest_set_session_file);
+    object_class_property_set_description(oc, "session-file",
+            "guest owners session parameters (encoded with base64)");
+    object_class_property_add_bool(oc, "kernel-hashes",
+                                   sev_guest_get_kernel_hashes,
+                                   sev_guest_set_kernel_hashes);
+    object_class_property_set_description(oc, "kernel-hashes",
+            "add kernel hashes to guest firmware for measured Linux boot");
+}
+
+static void
+sev_guest_instance_init(Object *obj)
+{
+    SevGuestState *sev = SEV_GUEST(obj);
+
+    sev->sev_device = g_strdup(DEFAULT_SEV_DEVICE);
+    sev->policy = DEFAULT_GUEST_POLICY;
+    object_property_add_uint32_ptr(obj, "policy", &sev->policy,
+                                   OBJ_PROP_FLAG_READWRITE);
+    object_property_add_uint32_ptr(obj, "handle", &sev->handle,
+                                   OBJ_PROP_FLAG_READWRITE);
+    object_property_add_uint32_ptr(obj, "cbitpos", &sev->cbitpos,
+                                   OBJ_PROP_FLAG_READWRITE);
+    object_property_add_uint32_ptr(obj, "reduced-phys-bits",
+                                   &sev->reduced_phys_bits,
+                                   OBJ_PROP_FLAG_READWRITE);
+}
+
+/* sev guest info */
+static const TypeInfo sev_guest_info = {
+    .parent = TYPE_CONFIDENTIAL_GUEST_SUPPORT,
+    .name = TYPE_SEV_GUEST,
+    .instance_size = sizeof(SevGuestState),
+    .instance_finalize = sev_guest_finalize,
+    .class_init = sev_guest_class_init,
+    .instance_init = sev_guest_instance_init,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_USER_CREATABLE },
+        { }
+    }
+};
+
  static void
  sev_register_types(void)
  {
diff --git a/target/i386/sev.h b/target/i386/sev.h
index e7499c95b1e8..9e10d09539a7 100644
--- a/target/i386/sev.h
+++ b/target/i386/sev.h
@@ -57,6 +57,4 @@ int sev_inject_launch_secret(const char *hdr, const char 
*secret,
  int sev_es_save_reset_vector(void *flash_ptr, uint64_t flash_size);
  void sev_es_set_reset_vector(CPUState *cpu);
-int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp); 
-
  #endif
--
2.34.1



With regards,
Daniel
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