[PATCH v11 6/6] allower the user to disable pv event support

[Hu Tao <hutao@xxxxxxxxxxxxxx>]

From: Wen Congyang <wency@xxxxxxxxxxxxxx>

Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
---
 hw/pc_piix.c    |    6 +++++-
 qemu-config.c   |    4 ++++
 qemu-options.hx |    3 ++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index fb67dc1..864d356 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -149,6 +149,8 @@ static void pc_init1(MemoryRegion *system_memory,
     MemoryRegion *pci_memory;
     MemoryRegion *rom_memory;
     void *fw_cfg = NULL;
+    QemuOptsList *list = qemu_find_opts("machine");
+    bool enable_pv_event;
 
     pc_cpus_init(cpu_model);
 
@@ -287,7 +289,9 @@ static void pc_init1(MemoryRegion *system_memory,
         pc_pci_device_init(pci_bus);
     }
 
-    if (kvm_enabled()) {
+    enable_pv_event = qemu_opt_get_bool(QTAILQ_FIRST(&list->head),
+                                        "enable_pv_event", false);
+    if (kvm_enabled() && enable_pv_event) {
         kvm_pv_event_init(isa_bus);
     }
 }
diff --git a/qemu-config.c b/qemu-config.c
index cd1ec21..db8f828 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -619,6 +619,10 @@ static QemuOptsList qemu_machine_opts = {
             .name = "mem-merge",
             .type = QEMU_OPT_BOOL,
             .help = "enable/disable memory merge support",
+        }, {
+            .name = "enable_pv_event",
+            .type = QEMU_OPT_BOOL,
+            .help = "handle pv event"
         },
         { /* End of list */ }
     },
diff --git a/qemu-options.hx b/qemu-options.hx
index 46f0539..de667d6 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -35,7 +35,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
     "                kernel_irqchip=on|off controls accelerated irqchip support\n"
     "                kvm_shadow_mem=size of KVM shadow MMU\n"
     "                dump-guest-core=on|off include guest memory in a core dump (default=on)\n"
-    "                mem-merge=on|off controls memory merge support (default: on)\n",
+    "                mem-merge=on|off controls memory merge support (default: on)\n"
+    "                enable_pv_event=on|off controls pv event support\n",
     QEMU_ARCH_ALL)
 STEXI
 @item -machine [type=]@var{name}[,prop=@var{value}[,...]]
-- 
1.7.10.2

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