tools/libxl: Add support for Viridian stimer direct mode

Add support to libxl for using the stimer enlightenments in direct mode.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@vates.tech>

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

@@ -2496,6 +2496,11 @@ ticks and hence enabling this group will ensure that ticks will be
 consistent with use of an enlightened time source (B<time_ref_count> or
 B<reference_tsc>).
 
+=item B<stimer_direct>
+
+This set is the same as the B<stimer> set but additionally supports
+using synthetic timers in direct mode.
+
 =item B<hcall_ipi>
 
 This set incorporates use of a hypercall for interprocessor interrupts.

tools/golang/xenlight/types.gen.go

@@ -234,6 +234,7 @@ ViridianEnlightenmentHcallIpi ViridianEnlightenment = 9
 ViridianEnlightenmentExProcessorMasks ViridianEnlightenment = 10
 ViridianEnlightenmentNoVpLimit ViridianEnlightenment = 11
 ViridianEnlightenmentCpuHotplug ViridianEnlightenment = 12
+ViridianEnlightenmentStimerDirect ViridianEnlightenment = 13
 )
 
 type Hdtype int

tools/include/libxl.h

@@ -389,6 +389,12 @@
  */
 #define LIBXL_HAVE_VIRIDIAN_HCALL_IPI 1
 
+/*
+ * LIBXL_HAVE_VIRIDIAN_STIMER_DIRECT indicates that the 'stimer_direct' value
+ * is present in the viridian enlightenment enumeration.
+ */
+#define LIBXL_HAVE_VIRIDIAN_STIMER_DIRECT 1
+
 /*
  * LIBXL_HAVE_BUILDINFO_HVM_ACPI_LAPTOP_SLATE indicates that
  * libxl_domain_build_info has the u.hvm.acpi_laptop_slate field.

tools/libs/light/libxl_types.idl

@@ -260,6 +260,7 @@ libxl_viridian_enlightenment = Enumeration("viridian_enlightenment", [
     (10, "ex_processor_masks"),
     (11, "no_vp_limit"),
     (12, "cpu_hotplug"),
+    (13, "stimer_direct"),
     ])
 
 libxl_hdtype = Enumeration("hdtype", [

tools/libs/light/libxl_x86.c

@@ -389,6 +389,11 @@ static int hvm_set_viridian_features(libxl__gc *gc, uint32_t domid,
     if (libxl_bitmap_test(&enlightenments, LIBXL_VIRIDIAN_ENLIGHTENMENT_CPU_HOTPLUG))
         mask |= HVMPV_cpu_hotplug;
 
+    if (libxl_bitmap_test(&enlightenments,
+                          LIBXL_VIRIDIAN_ENLIGHTENMENT_STIMER_DIRECT))
+        mask |= HVMPV_time_ref_count | HVMPV_synic | HVMPV_stimer |
+                HVMPV_stimer_direct;
+
     if (mask != 0 &&
         xc_hvm_param_set(CTX->xch,
                          domid,