[Qemu-devel] [PATCH] hmp: fix qemu crash due to ioapic state dump w/ split irqchip

[Wanpeng Li <kernellwp@gmail.com>]

From: Wanpeng Li <wanpeng.li@hotmail.com>

The qemu will crash when info ioapic through hmp if irqchip 
is split. Below message is splat:

KVM_GET_IRQCHIP failed: Unknown error -6

This patch fix it by dumping the ioapic state from the qemu 
emulated ioapic if irqchip is split.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
---
 target-i386/monitor.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target-i386/monitor.c b/target-i386/monitor.c
index fccfe40..bf1e983 100644
--- a/target-i386/monitor.c
+++ b/target-i386/monitor.c
@@ -504,7 +504,8 @@ void hmp_info_local_apic(Monitor *mon, const QDict *qdict)
 
 void hmp_info_io_apic(Monitor *mon, const QDict *qdict)
 {
-    if (kvm_irqchip_in_kernel()) {
+    if (kvm_irqchip_in_kernel() &&
+        !kvm_irqchip_is_split()) {
         kvm_ioapic_dump_state(mon, qdict);
     } else {
         ioapic_dump_state(mon, qdict);
-- 
1.9.1