[xen master] xen/riscv: provide init_vuart()

[patchbot@xxxxxxx]

commit f9194b586be9904235522a6194001e3dff21f3c8
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Wed Sep 23 12:26:48 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 30 15:00:12 2026 +0200

    xen/riscv: provide init_vuart()
    
    For debug purpose is enough to have only print messages from guest what is
    now implemented in vsbi_legacy_ecall_handler().
    
    For full guesst console support it will better to have something similar to
    [1], thereby there is nothing specific should be done, at least, for now
    and init_vuart() is provided to make dom0less code buildable.
    
    [1] 
https://lore.kernel.org/xen-devel/alpine.DEB.2.22.394.2602041533440.3175371@ubuntu-linux-20-04-desktop/
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/dom0less-build.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/xen/arch/riscv/dom0less-build.c b/xen/arch/riscv/dom0less-build.c
index a1fa51b996..d1a51b9293 100644
--- a/xen/arch/riscv/dom0less-build.c
+++ b/xen/arch/riscv/dom0less-build.c
@@ -8,6 +8,14 @@
 
 #include <asm/p2m.h>
 
+int __init init_vuart(struct domain *d, struct kernel_info *kinfo,
+                      const struct dt_device_node *node)
+{
+    /* Nothing to do at the moment */
+
+    return 0;
+}
+
 int __init init_intc_phandle(struct kernel_info *kinfo, const char *name,
                              const int node_next, const void *pfdt)
 {
--
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