[xen staging] x86/smp: perform disabling on interrupts ahead of AP shutdown

[patchbot@xxxxxxx]

commit db6daa9bf411260d2c1f5301e4fc786ae4a5cef8
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Thu Feb 6 12:20:04 2025 +0100
Commit:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
CommitDate: Wed Feb 12 15:56:07 2025 +0100

    x86/smp: perform disabling on interrupts ahead of AP shutdown
    
    Move the disabling of interrupt sources so it's done ahead of the offlining
    of APs.  This is to prevent AMD systems triggering "Receive accept error"
    when interrupts target CPUs that are no longer online.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Release-Acked-by: Oleksii Kurochko<oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/x86/smp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/smp.c b/xen/arch/x86/smp.c
index 1d3878826f..4d29a09a9a 100644
--- a/xen/arch/x86/smp.c
+++ b/xen/arch/x86/smp.c
@@ -374,6 +374,8 @@ void smp_send_stop(void)
         smp_call_function(stop_this_cpu, &stop_aps, 0);
 
     local_irq_disable();
+    disable_IO_APIC();
+    hpet_disable();
 
     if ( num_online_cpus() > 1 )
     {
@@ -389,8 +391,6 @@ void smp_send_stop(void)
 
     if ( cpu_online(cpu) )
     {
-        disable_IO_APIC();
-        hpet_disable();
         __stop_this_cpu();
         x2apic_enabled = (current_local_apic_mode() == APIC_MODE_X2APIC);
     }
--
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