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Subject[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 <wency@cn.fujitsu.com>
---
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 {
+ char *panicked_action;
+ int panicked_action_value;
+};
+
+#define DEFINE_PV_EVENT_PROPERTIES(_state, _conf) \
+ DEFINE_PROP_STRING("panicked_action", _state, _conf.panicked_action)
+
+static void panicked_mon_event(const char *action)
+{
+ QObject *data;
+
+ data = qobject_from_jsonf("{ 'action': %s }", action);
+ monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
+ qobject_decref(data);
+}
+
+static void panicked_perform_action(uint32_t panicked_action)
+{
+ switch (panicked_action) {
+ case PANICKED_REPORT:
+ panicked_mon_event("report");
+ break;
+
+ case PANICKED_PAUSE:
+ panicked_mon_event("pause");
+ vm_stop(RUN_STATE_GUEST_PANICKED);
+ break;
+
+ case PANICKED_POWEROFF:
+ panicked_mon_event("poweroff");
+ qemu_system_shutdown_request();
+ break;
+ case PANICKED_RESET:
+ panicked_mon_event("reset");
+ qemu_system_reset_request();
+ break;
+ }
+}
+
+static uint64_t supported_event(void)
+{
+ return 1 << KVM_PV_FEATURE_PANICKED;
+}
+
+static void handle_event(int event, struct pv_event_action *conf)
+{
+ if (event == KVM_PV_EVENT_PANICKED) {
+ panicked_perform_action(conf->panicked_action_value);
+ }
+}
+
+static int pv_event_init(struct pv_event_action *conf)
+{
+ if (!conf->panicked_action) {
+ conf->panicked_action_value = PANICKED_REPORT;
+ } else if (strcasecmp(conf->panicked_action, "none") == 0) {
+ conf->panicked_action_value = PANICKED_REPORT;
+ } else if (strcasecmp(conf->panicked_action, "pause") == 0) {
+ conf->panicked_action_value = PANICKED_PAUSE;
+ } else if (strcasecmp(conf->panicked_action, "poweroff") == 0) {
+ conf->panicked_action_value = PANICKED_POWEROFF;
+ } else if (strcasecmp(conf->panicked_action, "reset") == 0) {
+ conf->panicked_action_value = PANICKED_RESET;
+ } else {
+ return -1;
+ }
+
+ return 0;
+}
+
+#if defined(KVM_PV_EVENT_PORT)
+
+#include "pv_ioport.c"
+
+#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


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