From: Jan Beulich <jbeulich@suse.com>
Date: Mon, 16 Nov 2015 12:11:59 +0000 (+0100)
Subject: x86/IO-APIC: adjust setting of destinations
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~2249^2~1
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=a85da715cfffbc294589ad4edc4c7564ae6fcc25;p=xen.git

x86/IO-APIC: adjust setting of destinations

setup_IO_APIC_irqs() runs before APs get brought up, so using
desc->arch.cpu_mask as best risks it being either empty or having bits
for CPUs other than the BP set. Just use the APIC ID of the only
online CPU directly.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c
index 511cd4014c..6a71cef7f8 100644
--- a/xen/arch/x86/io_apic.c
+++ b/xen/arch/x86/io_apic.c
@@ -1039,7 +1039,7 @@ static void __init setup_IO_APIC_irqs(void)
                 disable_8259A_irq(irq_to_desc(irq));
 
             desc = irq_to_desc(irq);
-            SET_DEST(entry, logical, cpu_mask_to_apicid(desc->arch.cpu_mask));
+            SET_DEST(entry, logical, get_apic_id());
             spin_lock_irqsave(&ioapic_lock, flags);
             __ioapic_write_entry(apic, pin, 0, entry);
             set_native_irq_info(irq, TARGET_CPUS);