[xen staging] dom0less: Move single-xenstore check from bindings to set_xs_domain()

[patchbot@xxxxxxx]

commit 0b8604a71b18a88e3fccb2ef1c3d3aa8489b9ee3
Author:     Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
AuthorDate: Thu Jul 17 16:28:05 2025 +0200
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Thu Jul 17 16:54:02 2025 -0700

    dom0less: Move single-xenstore check from bindings to set_xs_domain()
    
    Later patches extract the bindings to a separate file, where that global
    won't be available. Make the check when calling the function instead so
    the bindings remain agnostic.
    
    Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
    Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
    Reviewed-by: Denis Mukhin <dmukhin@xxxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/common/device-tree/dom0less-build.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/xen/common/device-tree/dom0less-build.c 
b/xen/common/device-tree/dom0less-build.c
index 87828d4d9d..0012046574 100644
--- a/xen/common/device-tree/dom0less-build.c
+++ b/xen/common/device-tree/dom0less-build.c
@@ -38,6 +38,9 @@ static bool __initdata need_xenstore;
 
 void __init set_xs_domain(struct domain *d)
 {
+    if ( xs_domid != DOMID_INVALID )
+        panic("Only 1 xenstore domain can be specified! (%u)", xs_domid);
+
     xs_domid = d->domain_id;
     set_global_virq_handler(d, VIRQ_DOM_EXC);
 }
@@ -876,10 +879,6 @@ void __init create_domUs(void)
 
             if ( val & DOMAIN_CAPS_XENSTORE )
             {
-                if ( xs_domid != DOMID_INVALID )
-                    panic("Only 1 xenstore domain can be specified! (%u)\n",
-                            xs_domid);
-
                 d_cfg.flags |= XEN_DOMCTL_CDF_xs_domain;
                 d_cfg.max_evtchn_port = -1;
             }
--
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