Re: [Qemu-devel] [PATCH v8 5/6] introduce a new qom device to deal with panicked event

If the target is x86/x86_64, the guest's kernel will write 0x01 to the
port KVM_PV_EVENT_PORT when it is panciked. This patch introduces a new
qom device kvm_pv_ioport to listen this I/O port, and deal with panicked
event according to panicked_action's value. The possible actions are:
1. emit QEVENT_GUEST_PANICKED only
2. emit QEVENT_GUEST_PANICKED and pause the guest
3. emit QEVENT_GUEST_PANICKED and poweroff the guest
4. emit QEVENT_GUEST_PANICKED and reset the guest

I/O ports does not work for some targets(for example: s390). And you
can implement another qom device, and include it's code into pv_event.c
for such target.

Note: if we emit QEVENT_GUEST_PANICKED only, and the management
application does not receive this event(the management may not
run when the event is emitted), the management won't know the
guest is panicked.

Signed-off-by: Wen Congyang <redacted>
---
 hw/kvm/Makefile.objs |    2 +-
 hw/kvm/pv_event.c    |  109 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/kvm/pv_ioport.c   |   93 ++++++++++++++++++++++++++++++++++++++++++
 hw/pc_piix.c         |    9 ++++
 kvm.h                |    2 +
 5 files changed, 214 insertions(+), 1 deletions(-)
 create mode 100644 hw/kvm/pv_event.c
 create mode 100644 hw/kvm/pv_ioport.c

diff --git a/hw/kvm/Makefile.objs b/hw/kvm/Makefile.objs
index 226497a..23e3b30 100644
--- a/hw/kvm/Makefile.objs
+++ b/hw/kvm/Makefile.objs

@@ -1 +1 @@
-obj-$(CONFIG_KVM) += clock.o apic.o i8259.o ioapic.o i8254.o
+obj-$(CONFIG_KVM) += clock.o apic.o i8259.o ioapic.o i8254.o pv_event.o

diff --git a/hw/kvm/pv_event.c b/hw/kvm/pv_event.c
new file mode 100644
index 0000000..8897237
--- /dev/null
+++ b/hw/kvm/pv_event.c

@@ -0,0 +1,109 @@
+/*
+ * QEMU KVM support, paravirtual event device
+ *
+ * Copyright Fujitsu, Corp. 2012
+ *
+ * Authors:
+ *     Wen Congyang <wency@cn.fujitsu.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include <linux/kvm_para.h>
+#include <asm/kvm_para.h>
+#include <qobject.h>
+#include <qjson.h>
+#include <monitor.h>
+#include <sysemu.h>
+#include <kvm.h>
+
+/* Possible values for action parameter. */
+#define PANICKED_REPORT     1   /* emit QEVENT_GUEST_PANICKED only */
+#define PANICKED_PAUSE      2   /* emit QEVENT_GUEST_PANICKED and pause VM */
+#define PANICKED_POWEROFF   3   /* emit QEVENT_GUEST_PANICKED and quit VM */
+#define PANICKED_RESET      4   /* emit QEVENT_GUEST_PANICKED and reset VM */
+
+#define PV_EVENT_DRIVER     "kvm_pv_event"
+
+struct pv_event_action {

+
+#else
+void kvm_pv_event_init(void *opaque)
+{
+}
+#endif

diff --git a/hw/kvm/pv_ioport.c b/hw/kvm/pv_ioport.c
new file mode 100644
index 0000000..c2ed6b5
--- /dev/null
+++ b/hw/kvm/pv_ioport.c

@@ -0,0 +1,93 @@
+/*
+ * QEMU KVM support, paravirtual I/O port device
+ *
+ * Copyright Fujitsu, Corp. 2012
+ *
+ * Authors:
+ *     Wen Congyang <wency@cn.fujitsu.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "hw/isa.h"
+
+typedef struct {
+    ISADevice dev;
+    struct pv_event_action conf;
+    MemoryRegion ioport;
+} PVIOPortState;
+
+static uint64_t pv_io_read(void *opaque, target_phys_addr_t addr, unsigned size)
+{
+    return supported_event();
+}
+
+static void pv_io_write(void *opaque, target_phys_addr_t addr, uint64_t val,
+                        unsigned size)
+{
+    PVIOPortState *s = opaque;
+
+    handle_event(val, &s->conf);
+}
+
+static const MemoryRegionOps pv_io_ops = {
+    .read = pv_io_read,
+    .write = pv_io_write,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
+static int pv_ioport_initfn(ISADevice *dev)
+{
+    PVIOPortState *s = DO_UPCAST(PVIOPortState, dev, dev);
+
+    if (pv_event_init(&s->conf) < 0)
+        return -1;

+
+    memory_region_init_io(&s->ioport, &pv_io_ops, s, "pv_event", 1);
+    isa_register_ioport(dev, &s->ioport, KVM_PV_EVENT_PORT);
+
+    return 0;
+}
+
+static Property pv_ioport_properties[] = {
+    DEFINE_PV_EVENT_PROPERTIES(PVIOPortState, conf),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pv_ioport_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
+
+    ic->init = pv_ioport_initfn;
+    dc->no_user = 1;
+    dc->props = pv_ioport_properties;
+}
+
+static TypeInfo pv_ioport_info = {
+    .name          = PV_EVENT_DRIVER,
+    .parent        = TYPE_ISA_DEVICE,
+    .instance_size = sizeof(PVIOPortState),
+    .class_init    = pv_ioport_class_init,
+};
+
+static void pv_ioport_register_types(void)
+{
+    type_register_static(&pv_ioport_info);
+}
+
+type_init(pv_ioport_register_types)
+
+void kvm_pv_event_init(void *opaque)
+{
+    ISABus *bus = opaque;
+    ISADevice *dev;
+
+    dev = isa_create(bus, PV_EVENT_DRIVER);
+    qdev_init_nofail(&dev->qdev);
+}

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 0c0096f..4af8403 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c

@@ -46,6 +46,9 @@
 #ifdef CONFIG_XEN
 #  include <xen/hvm/hvm_info_table.h>
 #endif
+#ifdef CONFIG_KVM
+#   include <asm/kvm_para.h>
+#endif

 #define MAX_IDE_BUS 2

@@ -285,6 +288,12 @@ static void pc_init1(MemoryRegion *system_memory,
     if (pci_enabled) {
         pc_pci_device_init(pci_bus);
     }
+
+#ifdef KVM_PV_EVENT_PORT
+    if (kvm_enabled()) {
+        kvm_pv_event_init(isa_bus);
+    }
+#endif
 }

 static void pc_init_pci(ram_addr_t ram_size,

diff --git a/kvm.h b/kvm.h
index 2617dd5..598dcbe 100644
--- a/kvm.h
+++ b/kvm.h

@@ -222,4 +222,6 @@ int kvm_irqchip_add_irqfd(KVMState *s, int fd, int virq);
 int kvm_irqchip_remove_irqfd(KVMState *s, int fd, int virq);
 int kvm_irqchip_add_irq_notifier(KVMState *s, EventNotifier *n, int virq);
 int kvm_irqchip_remove_irq_notifier(KVMState *s, EventNotifier *n, int virq);
+
+void kvm_pv_event_init(void *opaque);
 #endif
--

1.7.1