[RFC PATCH v1 08/12] target.json: add migrate-set-sev-info command

["Singh, Brijesh" <brijesh.singh@xxxxxxx>]

The command can be used by the hypervisor to specify the target Platform
Diffie-Hellman key (PDH) and certificate chain before starting the SEV
guest migration. The values passed through the command will be used while
creating the outgoing encryption context.

Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
---
 qapi/target.json       | 18 ++++++++++++++++++
 target/i386/monitor.c  | 10 ++++++++++
 target/i386/sev-stub.c |  5 +++++
 target/i386/sev.c      | 11 +++++++++++
 target/i386/sev_i386.h |  9 ++++++++-
 5 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/qapi/target.json b/qapi/target.json
index 1d4d54b600..4109772298 100644
--- a/qapi/target.json
+++ b/qapi/target.json
@@ -512,3 +512,21 @@
 ##
 { 'command': 'query-cpu-definitions', 'returns': ['CpuDefinitionInfo'],
   'if': 'defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_I386) || defined(TARGET_S390X) || defined(TARGET_MIPS)' }
+
+##
+# @migrate-set-sev-info:
+#
+# The command is used to provide the target host information used during the
+# SEV guest.
+#
+# @pdh the target host platform diffie-hellman key encoded in base64
+#
+# @plat-cert the target host platform certificate chain encoded in base64
+#
+# @amd-cert AMD certificate chain which include ASK and OCA encoded in base64
+#
+# Since 4.3
+#
+##
+{ 'command': 'migrate-set-sev-info',
+  'data': { 'pdh': 'str', 'plat-cert': 'str', 'amd-cert' : 'str' }}
diff --git a/target/i386/monitor.c b/target/i386/monitor.c
index 56e2dbece7..68e2e2b8ec 100644
--- a/target/i386/monitor.c
+++ b/target/i386/monitor.c
@@ -736,3 +736,13 @@ SevCapability *qmp_query_sev_capabilities(Error **errp)
 
     return data;
 }
+
+void qmp_migrate_set_sev_info(const char *pdh, const char *plat_cert,
+                              const char *amd_cert, Error **errp)
+{
+    if (sev_enabled()) {
+        sev_set_migrate_info(pdh, plat_cert, amd_cert);
+    } else {
+        error_setg(errp, "SEV is not enabled");
+    }
+}
diff --git a/target/i386/sev-stub.c b/target/i386/sev-stub.c
index e5ee13309c..173bfa6374 100644
--- a/target/i386/sev-stub.c
+++ b/target/i386/sev-stub.c
@@ -48,3 +48,8 @@ SevCapability *sev_get_capabilities(void)
 {
     return NULL;
 }
+
+void sev_set_migrate_info(const char *pdh, const char *plat_cert,
+                          const char *amd_cert)
+{
+}
diff --git a/target/i386/sev.c b/target/i386/sev.c
index 1b05fcf9a9..2c7c496593 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -852,6 +852,17 @@ int sev_sync_page_enc_bitmap(void *handle, uint8_t *host, uint64_t size,
     return 0;
 }
 
+void sev_set_migrate_info(const char *pdh, const char *plat_cert,
+                          const char *amd_cert)
+{
+    SEVState *s = sev_state;
+
+    s->remote_pdh = g_base64_decode(pdh, &s->remote_pdh_len);
+    s->remote_plat_cert = g_base64_decode(plat_cert,
+                                          &s->remote_plat_cert_len);
+    s->amd_cert = g_base64_decode(amd_cert, &s->amd_cert_len);
+}
+
 static void
 sev_register_types(void)
 {
diff --git a/target/i386/sev_i386.h b/target/i386/sev_i386.h
index c0f9373beb..258047ab2c 100644
--- a/target/i386/sev_i386.h
+++ b/target/i386/sev_i386.h
@@ -39,7 +39,8 @@ extern uint32_t sev_get_cbit_position(void);
 extern uint32_t sev_get_reduced_phys_bits(void);
 extern char *sev_get_launch_measurement(void);
 extern SevCapability *sev_get_capabilities(void);
-
+extern void sev_set_migrate_info(const char *pdh, const char *plat_cert,
+                                 const char *amd_cert);
 typedef struct QSevGuestInfo QSevGuestInfo;
 typedef struct QSevGuestInfoClass QSevGuestInfoClass;
 
@@ -81,6 +82,12 @@ struct SEVState {
     int sev_fd;
     SevState state;
     gchar *measurement;
+    guchar *remote_pdh;
+    size_t remote_pdh_len;
+    guchar *remote_plat_cert;
+    size_t remote_plat_cert_len;
+    guchar *amd_cert;
+    size_t amd_cert_len;
 };
 
 typedef struct SEVState SEVState;
-- 
2.17.1