[xen staging] xen/riscv: initialize RCU, scheduler, and system domains in start_xen()

[patchbot@xxxxxxx]

commit f78cdb107c84e677134017129ee047695c7b646f
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Wed Sep 23 12:26:47 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 30 14:59:55 2026 +0200

    xen/riscv: initialize RCU, scheduler, and system domains in start_xen()
    
    Wire up the missing early-boot initialization steps in start_xen().
    
    The scheduler must be initialized prior to do_initcalls() because
    cpupool_create_pool() is called during initcalls; without it,
    BUG_ON(IS_ERR(pool)) is triggered inside cpupool_create_pool().
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/setup.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/xen/arch/riscv/setup.c b/xen/arch/riscv/setup.c
index 07f46ac3ce..05f93a74c9 100644
--- a/xen/arch/riscv/setup.c
+++ b/xen/arch/riscv/setup.c
@@ -6,9 +6,12 @@
 #include <xen/compile.h>
 #include <xen/console.h>
 #include <xen/device_tree.h>
+#include <xen/domain.h>
 #include <xen/init.h>
 #include <xen/irq.h>
 #include <xen/mm.h>
+#include <xen/rcupdate.h>
+#include <xen/sched.h>
 #include <xen/serial.h>
 #include <xen/shutdown.h>
 #include <xen/smp.h>
@@ -160,12 +163,21 @@ void __init noreturn start_xen(unsigned long bootcpu_id,
 
     timer_init();
 
+    rcu_init();
+
+    setup_system_domains();
+
     local_irq_enable();
 
     console_init_postirq();
 
     guest_mm_init();
 
+    scheduler_init();
+    set_current(idle_vcpu[0]);
+
+    do_initcalls();
+
     printk("All set up\n");
 
     machine_halt();
--
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