[xen stable-4.19] x86/smp: perform disabling on interrupts ahead of AP shutdown

[patchbot@xxxxxxx]

commit 30aadc8dbc9ac1abf88bfeb370d1c27c5ea9d1e6
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Mon Feb 17 13:23:50 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Feb 17 13:23:50 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>
    master commit: db6daa9bf411260d2c1f5301e4fc786ae4a5cef8
    master date: 2025-02-12 15:56:07 +0100
---
 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 bd92496d3d..eb134ecac8 100644
--- a/xen/arch/x86/smp.c
+++ b/xen/arch/x86/smp.c
@@ -372,6 +372,8 @@ 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 )
     {
@@ -387,8 +389,6 @@ 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);
     }
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.19