Introducing SCMI-mediator feature.

MAINTAINERS

@@ -538,6 +538,12 @@ S:	Supported
 F:	xen/arch/arm/include/asm/tee
 F:	xen/arch/arm/tee/
 
+SCI MEDIATORS
+M:	Oleksii Moisieiev <[email protected]>
+S:	Supported
+F:	xen/arch/arm/sci
+F:	xen/include/asm-arm/sci
+
 TOOLSTACK
 M:	Wei Liu <[email protected]>
 M:	Anthony PERARD <[email protected]>

docs/man/xl.cfg.5.pod.in

@@ -1715,6 +1715,28 @@ Specifies OS ID.
 
 =back
 
+=item B<arm_sci="STRING">
+
+B<Arm only> Set ARM_SCI type for the guest. ARM_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 ARM_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.
+SCP is used as transport.
+
+=back
+
 =back
 
 =head2 Paravirtualised (PV) Guest Specific Options

tools/include/libxl.h

@@ -308,6 +308,11 @@
  */
 #define LIBXL_HAVE_BUILDINFO_ARCH_ARM_SVE_VL 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

tools/include/xenctrl.h

@@ -1230,6 +1230,9 @@ int xc_domain_getvnuma(xc_interface *xch,
 int xc_domain_soft_reset(xc_interface *xch,
                          uint32_t domid);
 
+int xc_domain_get_sci_info(xc_interface *xch, uint32_t domid,
+                           uint64_t *paddr, uint32_t *func_id);
+
 #if defined(__i386__) || defined(__x86_64__)
 /*
  * PC BIOS standard E820 types and structure.

tools/libs/ctrl/xc_domain.c

@@ -2180,6 +2180,24 @@ int xc_domain_soft_reset(xc_interface *xch,
     domctl.domain = domid;
     return do_domctl(xch, &domctl);
 }
+
+int xc_domain_get_sci_info(xc_interface *xch, uint32_t domid,
+                            uint64_t *paddr, uint32_t *func_id)
+{
+    struct xen_domctl domctl = {};
+
+    memset(&domctl, 0, sizeof(domctl));
+    domctl.cmd = XEN_DOMCTL_get_sci_info;
+    domctl.domain = domid;
+
+    if ( do_domctl(xch, &domctl) != 0 )
+        return 1;
+
+    *paddr = domctl.u.sci_info.paddr;
+    *func_id = domctl.u.sci_info.func_id;
+    return 0;
+}
+
 /*
  * Local variables:
  * mode: C

tools/libs/hypfs/core.c

@@ -307,8 +307,6 @@ char *xenhypfs_read(xenhypfs_handle *fshdl, const char *path)
         errno = EISDIR;
         break;
     case xenhypfs_type_blob:
-        errno = EDOM;
-        break;
     case xenhypfs_type_string:
         ret_buf = buf;
         buf = NULL;