linux-kernel - [PATCH v13 7/8] allower the user to disable pv event support

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Message-Id: <1af3c134891e119a21268ac6c48434447a8f6ab2.1362051582.git.hutao@cn.fujitsu.com>
Date:	Thu, 28 Feb 2013 20:13:18 +0800
From:	Hu Tao <hutao@...fujitsu.com>
To:	kvm list <kvm@...r.kernel.org>, qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Gleb Natapov <gleb@...hat.com>,
	Blue Swirl <blauwirbel@...il.com>,
	Eric Blake <eblake@...hat.com>,
	Andrew Jones <drjones@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Anthony Liguori <aliguori@...ibm.com>,
	Markus Armbruster <armbru@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Stefan Hajnoczi <stefanha@...hat.com>,
	Juan Quintela <quintela@...hat.com>,
	Orit Wasserman <owasserm@...hat.com>,
	Kevin Wolf <kwolf@...hat.com>,
	Wen Congyang <wency@...fujitsu.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Alexander Graf <agraf@...e.de>,
	Alex Williamson <alex.williamson@...hat.com>,
	Peter Maydell <peter.maydell@...aro.org>
Subject: [PATCH v13 7/8] allower the user to disable pv event support

Signed-off-by: Wen Congyang <wency@...fujitsu.com>
Signed-off-by: Hu Tao <hutao@...fujitsu.com>
---
 hw/pc_piix.c    | 9 ++++++++-
 qemu-options.hx | 3 ++-
 vl.c            | 4 ++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 24a9bf3..82a421a 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -44,6 +44,7 @@
 #include "exec/memory.h"
 #include "exec/address-spaces.h"
 #include "cpu.h"
+#include "qemu/config-file.h"
 #ifdef CONFIG_XEN
 #  include <xen/hvm/hvm_info_table.h>
 #endif
@@ -86,6 +87,8 @@ 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 = false;
 
     pc_cpus_init(cpu_model);
     pc_acpi_init("acpi-dsdt.aml");
@@ -218,7 +221,11 @@ static void pc_init1(MemoryRegion *system_memory,
         pc_pci_device_init(pci_bus);
     }
 
-    if (kvm_enabled()) {
+    if (list && !QTAILQ_EMPTY(&list->head)) {
+        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-options.hx b/qemu-options.hx
index 797d992..1ad4041 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 (default: off)\n",
     QEMU_ARCH_ALL)
 STEXI
 @item -machine [type=]@var{name}[,prop=@...{value}[,...]]
diff --git a/vl.c b/vl.c
index 51d4922..5b3a279 100644
--- a/vl.c
+++ b/vl.c
@@ -427,6 +427,10 @@ static QemuOptsList qemu_machine_opts = {
             .name = "usb",
             .type = QEMU_OPT_BOOL,
             .help = "Set on/off to enable/disable usb",
+        }, {
+            .name = "enable_pv_event",
+            .type = QEMU_OPT_BOOL,
+            .help = "handle pv event"
         },
         { /* End of list */ }
     },
-- 
1.8.1.4

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