[PATCH] Fix default accelerator when building with --disable-kvm

["Daniel P. Berrange" <berrange@redhat.com>]

From: "Daniel P. Berrange" <berrange@redhat.com>

The following commit

  commit 3ad763fcba5bd0ec5a79d4a9b6baeef119dd4a3d
  Author: Jan Kiszka <jan.kiszka@siemens.com>
  Date:   Fri Mar 2 10:30:43 2012 +0100

    qemu-kvm: Use machine options to configure qemu-kvm defaults

    Upstream is moving towards this mechanism, so start using it in qemu-kvm
    already to configure the specific defaults: kvm enabled on, just like
    in-kernel irqchips.

prevents qemu from starting when it has been build with the
--disable-kvm argument, because the accelerator is hardcoded
to 'kvm'.  This is a regression previously fixed by

  commit ce967f6610dcd7b7762dbad5a639fecf42d5c76d
  Author: Daniel P. Berrange <berrange@redhat.com>
  Date:   Fri Aug 5 09:50:29 2011 +0100

    Fix default accelerator when configured with --disable-kvm

    The default accelerator is hardcoded to 'kvm'. This is a fine
    default for qemu-kvm normally, but if the user built with
    ./configure --disable-kvm, then the resulting binaries will
    not work by default

The fix is again to make this conditional on CONFIG_KVM_OPTIONS

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 hw/pc_piix.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 98a06fa..35202dd 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -360,7 +360,9 @@ static QEMUMachine pc_machine_v1_2 = {
     .init = pc_init_pci,
     .max_cpus = 255,
     .is_default = 1,
+#ifdef CONFIG_KVM_OPTIONS
     .default_machine_opts = "accel=kvm,kernel_irqchip=on",
+#endif
 };
 
 #define PC_COMPAT_1_1 \
@@ -469,7 +471,9 @@ static QEMUMachine pc_machine_v0_14 = {
     .desc = "Standard PC",
     .init = pc_init_pci,
     .max_cpus = 255,
+#ifdef CONFIG_KVM_OPTIONS
     .default_machine_opts = "accel=kvm,kernel_irqchip=on",
+#endif
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_0_14, 
         {
@@ -503,7 +507,9 @@ static QEMUMachine pc_machine_v0_13 = {
     .desc = "Standard PC",
     .init = pc_init_pci_no_kvmclock,
     .max_cpus = 255,
+#ifdef CONFIG_KVM_OPTIONS
     .default_machine_opts = "accel=kvm,kernel_irqchip=on",
+#endif
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_0_13,
         {
@@ -541,7 +547,9 @@ static QEMUMachine pc_machine_v0_12 = {
     .desc = "Standard PC",
     .init = pc_init_pci_no_kvmclock,
     .max_cpus = 255,
+#ifdef CONFIG_KVM_OPTIONS
     .default_machine_opts = "accel=kvm,kernel_irqchip=on",
+#endif
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_0_12,
         {
@@ -575,7 +583,9 @@ static QEMUMachine pc_machine_v0_11 = {
     .desc = "Standard PC, qemu 0.11",
     .init = pc_init_pci_no_kvmclock,
     .max_cpus = 255,
+#ifdef CONFIG_KVM_OPTIONS
     .default_machine_opts = "accel=kvm,kernel_irqchip=on",
+#endif
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_0_11,
         {
@@ -597,7 +607,9 @@ static QEMUMachine pc_machine_v0_10 = {
     .desc = "Standard PC, qemu 0.10",
     .init = pc_init_pci_no_kvmclock,
     .max_cpus = 255,
+#ifdef CONFIG_KVM_OPTIONS
     .default_machine_opts = "accel=kvm,kernel_irqchip=on",
+#endif
     .compat_props = (GlobalProperty[]) {
         PC_COMPAT_0_11,
         {
@@ -631,7 +643,9 @@ static QEMUMachine isapc_machine = {
     .desc = "ISA-only PC",
     .init = pc_init_isa,
     .max_cpus = 1,
+#ifdef CONFIG_KVM_OPTIONS
     .default_machine_opts = "accel=kvm,kernel_irqchip=on",
+#endif
     .compat_props = (GlobalProperty[]) {
         {
             .driver   = "pc-sysfw",
-- 
1.7.10.2