From a88ae0d44b6b5830b752641b2198735272f13eaf Mon Sep 17 00:00:00 2001
From: Eduardo Habkost <ehabkost@redhat.com>
Date: Mon, 28 Sep 2015 17:01:23 -0300
Subject: [PATCH] pc: Require xen when initializing xenfv machine

Without this check, the xen-platform device will crash on reset
if using the accel option with anything other than xen (e.g.
"-machine xenfv,accel=kvm").

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 hw/i386/pc_piix.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index ae7bbebd0f..a91cc3dada 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -434,6 +434,11 @@ static void pc_xen_hvm_init(MachineState *machine)
 {
     PCIBus *bus;
 
+    if (!xen_enabled()) {
+        error_report("xenfv machine requires the xen accelerator");
+        exit(1);
+    }
+
     pc_xen_hvm_init_pci(machine);
 
     bus = pci_find_primary_bus();
-- 
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