[xen staging] domctl: Handle XEN_DOMCTL_getpageframeinfo3 without the domctl lock

[patchbot@xxxxxxx]

commit 261a2f51df86a5b63c1386e333498211bb364cb7
Author:     Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
AuthorDate: Tue Jun 9 16:15:27 2026 +0100
Commit:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
CommitDate: Wed Jun 10 14:50:40 2026 +0200

    domctl: Handle XEN_DOMCTL_getpageframeinfo3 without the domctl lock
    
    It does not have side effects and is protected from concurrent changes
    by the P2M read lock therefore skip taking the domctl lock.
    
    Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/x86/domctl.c | 4 ++++
 xen/common/domctl.c   | 1 +
 2 files changed, 5 insertions(+)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 83bf51e498..0e9a253288 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -301,6 +301,10 @@ long arch_do_domctl(
         /* Games to allow this code block to handle a compat guest. */
         void __user *guest_handle = domctl->u.getpageframeinfo3.array.p;
 
+        ret = xsm_domctl(XSM_OTHER, d, domctl);
+        if ( ret )
+            break;
+
         if ( unlikely(num > 1024) ||
              unlikely(num != domctl->u.getpageframeinfo3.num) )
         {
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 3efa5b9d55..35144d95b8 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -555,6 +555,7 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) 
u_domctl)
     case XEN_DOMCTL_gsi_permission:
     case XEN_DOMCTL_bind_pt_irq:
     case XEN_DOMCTL_unbind_pt_irq:
+    case XEN_DOMCTL_getpageframeinfo3:
         ret = arch_do_domctl(op, d, u_domctl);
         goto domctl_out_unlock_domonly;
 
--
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