[RFC v1 4/5] tools/arm: add "scmi_smc" option to xl.cfg

[Oleksii Moisieiev <Oleksii_Moisieiev@xxxxxxxx>]

This enumeration sets SCI type for the domain. Currently there is
two possible options: either 'none' or 'scmi_smc'.

'none' is the default value and it disables SCI support at all.

'scmi_smc' enables access to the Firmware from the domains using SCMI
protocol and SMC as transport.

Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@xxxxxxxx>
---
 docs/man/xl.cfg.5.pod.in         | 22 ++++++++++++++++++++++
 tools/include/libxl.h            |  5 +++++
 tools/libs/light/libxl_types.idl |  6 ++++++
 tools/xl/xl_parse.c              |  9 +++++++++
 4 files changed, 42 insertions(+)

diff --git a/docs/man/xl.cfg.5.pod.in b/docs/man/xl.cfg.5.pod.in
index b98d161398..92d0593875 100644
--- a/docs/man/xl.cfg.5.pod.in
+++ b/docs/man/xl.cfg.5.pod.in
@@ -1614,6 +1614,28 @@ This feature is a B<technology preview>.
 
 =back
 
+=item B<sci="STRING">
+
+B<Arm only> Set SCI type for the guest. SCI is System Control Protocol -
+allows domain to manage various functions that are provided by HW platform.
+
+=over 4
+
+=item B<none>
+
+Don't allow guest to use SCI if present on the platform. This is the default
+value.
+
+=item B<scmi_smc>
+
+Enables SCMI-SMC support for the guest. SCMI is System Control Management
+Inferface - allows domain to manage various functions that are provided by HW
+platform, such as clocks, resets and power-domains. Xen will mediate access to
+clocks, power-domains and resets between Domains and ATF. Disabled by default.
+SMC is used as transport.
+
+=back
+
 =back
 
 =head2 Paravirtualised (PV) Guest Specific Options
diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index 2bbbd21f0b..30e5aee119 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -278,6 +278,11 @@
  */
 #define LIBXL_HAVE_BUILDINFO_ARCH_ARM_TEE 1
 
+/*
+ * libxl_domain_build_info has the arch_arm.sci field.
+ */
+#define LIBXL_HAVE_BUILDINFO_ARCH_ARM_SCI 1
+
 /*
  * LIBXL_HAVE_SOFT_RESET indicates that libxl supports performing
  * 'soft reset' for domains and there is 'soft_reset' shutdown reason
diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl
index 2a42da2f7d..9067b509f4 100644
--- a/tools/libs/light/libxl_types.idl
+++ b/tools/libs/light/libxl_types.idl
@@ -480,6 +480,11 @@ libxl_tee_type = Enumeration("tee_type", [
     (1, "optee")
     ], init_val = "LIBXL_TEE_TYPE_NONE")
 
+libxl_sci_type = Enumeration("sci_type", [
+    (0, "none"),
+    (1, "scmi_smc")
+    ], init_val = "LIBXL_SCI_TYPE_NONE")
+
 libxl_rdm_reserve = Struct("rdm_reserve", [
     ("strategy",    libxl_rdm_reserve_strategy),
     ("policy",      libxl_rdm_reserve_policy),
@@ -564,6 +569,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
     ("apic",             libxl_defbool),
     ("dm_restrict",      libxl_defbool),
     ("tee",              libxl_tee_type),
+    ("sci",              libxl_sci_type),
     ("u", KeyedUnion(None, libxl_domain_type, "type",
                 [("hvm", Struct(None, [("firmware",         string),
                                        ("bios",             libxl_bios_type),
diff --git a/tools/xl/xl_parse.c b/tools/xl/xl_parse.c
index 117fcdcb2b..c37bf6298b 100644
--- a/tools/xl/xl_parse.c
+++ b/tools/xl/xl_parse.c
@@ -2747,6 +2747,15 @@ skip_usbdev:
         }
     }
 
+    if (!xlu_cfg_get_string (config, "sci", &buf, 1)) {
+        e = libxl_sci_type_from_string(buf, &b_info->sci);
+        if (e) {
+            fprintf(stderr,
+                    "Unknown sci \"%s\" specified\n", buf);
+            exit(-ERROR_FAIL);
+        }
+    }
+
     parse_vkb_list(config, d_config);
 
     xlu_cfg_get_defbool(config, "xend_suspend_evtchn_compat",
-- 
2.27.0