kvm: notify host when the guest is panicked

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 <[email protected]>

---
 hw/kvm/Makefile.objs |    2 +-
 hw/kvm/pv_event.c    |  190 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/pc_piix.c         |    9 +++
 kvm.h                |    2 +
 4 files changed, 202 insertions(+), 1 deletions(-)
 create mode 100644 hw/kvm/pv_event.c

hw/kvm/Makefile.objs +1 -1

index 226497a..23e3b30 100644
@@ -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

hw/kvm/pv_event.c new file +178 -0

new file mode 100644
index 0000000..c03dd22
@@ -0,0 +1,190 @@
+/*
+ * QEMU KVM support, paravirtual event device
+ *
+ * Copyright Fujitsu, Corp. 2012
+ *
+ * Authors:
+ *     Wen Congyang <[email protected]>
+ *
+ * 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 PVEventAction {
+    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 PVEventAction *conf)
+{
+    if (event == KVM_PV_EVENT_PANICKED) {
+        panicked_perform_action(conf->panicked_action_value);
+    }
+}
+
+static int pv_event_init(struct PVEventAction *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 "hw/isa.h"
+
+typedef struct {
+    ISADevice dev;
+    struct PVEventAction 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)
+{

hw/kvm/pv_event.c new file +2 -0

+}
+#endif

hw/pc_piix.c +3 -0

index 88ff041..f73fb85 100644
@@ -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
 

hw/pc_piix.c +2 -0

+    }
+#endif
 }
 
 static void pc_init_pci(ram_addr_t ram_size,

kvm.h +0 -0

index 5b8f588..41ce1b2 100644

Quoted 224 lines

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 <[email protected]>

---
 hw/kvm/Makefile.objs |    2 +-
 hw/kvm/pv_event.c    |  190 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/pc_piix.c         |    9 +++
 kvm.h                |    2 +
 4 files changed, 202 insertions(+), 1 deletions(-)
 create mode 100644 hw/kvm/pv_event.c

hw/kvm/Makefile.objs +1 -1

index 226497a..23e3b30 100644
@@ -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

hw/kvm/pv_event.c new file +184 -0

new file mode 100644
index 0000000..c03dd22
@@ -0,0 +1,190 @@
+/*
+ * QEMU KVM support, paravirtual event device
+ *
+ * Copyright Fujitsu, Corp. 2012
+ *
+ * Authors:
+ *     Wen Congyang <[email protected]>
+ *
+ * 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 PVEventAction {
+    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 PVEventAction *conf)
+{
+    if (event == KVM_PV_EVENT_PANICKED) {
+        panicked_perform_action(conf->panicked_action_value);
+    }
+}
+
+static int pv_event_init(struct PVEventAction *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 "hw/isa.h"
+
+typedef struct {
+    ISADevice dev;
+    struct PVEventAction 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);
+}

hw/kvm/pv_event.c line 188

Quoted 4 lines

hw/kvm/pv_event.c new file +4 -0

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

Some comment that this stub requires an implementation whenever it is actually built would be helpful. Something that explains a different transport than PIO will be needed.

Quoted 18 lines

hw/kvm/pv_event.c new file +2 -0

+}
+#endif

hw/pc_piix.c +3 -0

index 88ff041..f73fb85 100644
@@ -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
 

hw/pc_piix.c static void pc_init1(MemoryRegion *system_memory, · line 292

Quoted 5 lines

hw/pc_piix.c +2 -0

@@ -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

This file is x86-only, and there we have KVM_PV_EVENT_PORT unconditionally. So drop the #ifdef.

hw/pc_piix.c static void pc_init1(MemoryRegion *system_memory, · line 294

Quoted 2 lines

hw/pc_piix.c +2 -0

+    if (kvm_enabled()) {
+        kvm_pv_event_init(isa_bus);

But you are missing a kvm-stub entry for kvm_pv_event_init. A --disable-kvm build should be broken for that reason.

Quoted 12 lines

hw/pc_piix.c +2 -0

+    }
+#endif
 }
 
 static void pc_init_pci(ram_addr_t ram_size,

kvm.h +0 -0

index 5b8f588..41ce1b2 100644

kvm.h int kvm_irqchip_add_irqfd(KVMState *s, int fd, int virq); · line 281

Quoted 6 lines

kvm.h +2 -0

@@ -276,4 +276,6 @@ 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

Jan

At 08/23/2012 06:51 PM, Jan Kiszka Wrote:

Quoted 225 lines · Wen Congyang

Quoted 224 lines

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 <[email protected]>

---
 hw/kvm/Makefile.objs |    2 +-
 hw/kvm/pv_event.c    |  190 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/pc_piix.c         |    9 +++
 kvm.h                |    2 +
 4 files changed, 202 insertions(+), 1 deletions(-)
 create mode 100644 hw/kvm/pv_event.c

hw/kvm/Makefile.objs +1 -1

index 226497a..23e3b30 100644
@@ -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

hw/kvm/pv_event.c new file +184 -0

new file mode 100644
index 0000000..c03dd22
@@ -0,0 +1,190 @@
+/*
+ * QEMU KVM support, paravirtual event device
+ *
+ * Copyright Fujitsu, Corp. 2012
+ *
+ * Authors:
+ *     Wen Congyang <[email protected]>
+ *
+ * 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 PVEventAction {
+    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 PVEventAction *conf)
+{
+    if (event == KVM_PV_EVENT_PANICKED) {
+        panicked_perform_action(conf->panicked_action_value);
+    }
+}
+
+static int pv_event_init(struct PVEventAction *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 "hw/isa.h"
+
+typedef struct {
+    ISADevice dev;
+    struct PVEventAction 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);
+}

Quoted 8 lines

hw/kvm/pv_event.c line 188

Quoted 4 lines

hw/kvm/pv_event.c new file +4 -0

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

Some comment that this stub requires an implementation whenever it is actually built would be helpful. Something that explains a different transport than PIO will be needed.

OK

Quoted 30 lines

Quoted 18 lines

hw/kvm/pv_event.c new file +2 -0

+}
+#endif

hw/pc_piix.c +3 -0

index 88ff041..f73fb85 100644
@@ -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
 

hw/pc_piix.c static void pc_init1(MemoryRegion *system_memory, · line 292

Quoted 5 lines

hw/pc_piix.c +2 -0

@@ -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

This file is x86-only, and there we have KVM_PV_EVENT_PORT unconditionally. So drop the #ifdef.

Quoted 2 lines

hw/pc_piix.c +2 -0

+    if (kvm_enabled()) {
+        kvm_pv_event_init(isa_bus);

Quoted 2 lines

But you are missing a kvm-stub entry for kvm_pv_event_init. A --disable-kvm build should be broken for that reason.

Hmm, KVM_PV_EVENT_PORT is defined in asm/kvm_para.h, and I include this file only when CONFIG_KVM is defined. So --disable-kvm build does not be broken in my test.

Quoted 267 lines

At 08/23/2012 06:51 PM, Jan Kiszka Wrote:

Quoted 225 lines · Wen Congyang

Quoted 224 lines

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 <[email protected]>

---
 hw/kvm/Makefile.objs |    2 +-
 hw/kvm/pv_event.c    |  190 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/pc_piix.c         |    9 +++
 kvm.h                |    2 +
 4 files changed, 202 insertions(+), 1 deletions(-)
 create mode 100644 hw/kvm/pv_event.c

hw/kvm/Makefile.objs +1 -1

index 226497a..23e3b30 100644
@@ -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

hw/kvm/pv_event.c new file +184 -0

new file mode 100644
index 0000000..c03dd22
@@ -0,0 +1,190 @@
+/*
+ * QEMU KVM support, paravirtual event device
+ *
+ * Copyright Fujitsu, Corp. 2012
+ *
+ * Authors:
+ *     Wen Congyang <[email protected]>
+ *
+ * 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 PVEventAction {
+    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 PVEventAction *conf)
+{
+    if (event == KVM_PV_EVENT_PANICKED) {
+        panicked_perform_action(conf->panicked_action_value);
+    }
+}
+
+static int pv_event_init(struct PVEventAction *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 "hw/isa.h"
+
+typedef struct {
+    ISADevice dev;
+    struct PVEventAction 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);
+}

Quoted 8 lines

hw/kvm/pv_event.c line 188

Quoted 4 lines

hw/kvm/pv_event.c new file +4 -0

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

Some comment that this stub requires an implementation whenever it is actually built would be helpful. Something that explains a different transport than PIO will be needed.

OK

Quoted 30 lines

Quoted 18 lines

hw/kvm/pv_event.c new file +2 -0

+}
+#endif

hw/pc_piix.c +3 -0

index 88ff041..f73fb85 100644
@@ -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
 

hw/pc_piix.c static void pc_init1(MemoryRegion *system_memory, · line 292

Quoted 5 lines

hw/pc_piix.c +2 -0

@@ -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

This file is x86-only, and there we have KVM_PV_EVENT_PORT unconditionally. So drop the #ifdef.

Quoted 2 lines

hw/pc_piix.c +2 -0

+    if (kvm_enabled()) {
+        kvm_pv_event_init(isa_bus);

Quoted 6 lines

Quoted 2 lines

But you are missing a kvm-stub entry for kvm_pv_event_init. A --disable-kvm build should be broken for that reason.

Hmm, KVM_PV_EVENT_PORT is defined in asm/kvm_para.h, and I include this file only when CONFIG_KVM is defined. So --disable-kvm build does not be broken in my test.

Yeah, but that is a bit ugly and another reason to go for a proper kvm-stub.

Jan

At 08/24/2012 02:21 PM, Jan Kiszka Wrote:

Quoted 275 lines · Wen Congyang

Quoted 273 lines

At 08/23/2012 06:51 PM, Jan Kiszka Wrote:

Quoted 225 lines · Wen Congyang

Quoted 224 lines

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 <[email protected]>

---
 hw/kvm/Makefile.objs |    2 +-
 hw/kvm/pv_event.c    |  190 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/pc_piix.c         |    9 +++
 kvm.h                |    2 +
 4 files changed, 202 insertions(+), 1 deletions(-)
 create mode 100644 hw/kvm/pv_event.c

hw/kvm/Makefile.objs +1 -1

index 226497a..23e3b30 100644
@@ -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

hw/kvm/pv_event.c new file +184 -0

new file mode 100644
index 0000000..c03dd22
@@ -0,0 +1,190 @@
+/*
+ * QEMU KVM support, paravirtual event device
+ *
+ * Copyright Fujitsu, Corp. 2012
+ *
+ * Authors:
+ *     Wen Congyang <[email protected]>
+ *
+ * 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 PVEventAction {
+    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 PVEventAction *conf)
+{
+    if (event == KVM_PV_EVENT_PANICKED) {
+        panicked_perform_action(conf->panicked_action_value);
+    }
+}
+
+static int pv_event_init(struct PVEventAction *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 "hw/isa.h"
+
+typedef struct {
+    ISADevice dev;
+    struct PVEventAction 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);
+}

Quoted 8 lines

hw/kvm/pv_event.c line 188

Quoted 4 lines

hw/kvm/pv_event.c new file +4 -0

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

Some comment that this stub requires an implementation whenever it is actually built would be helpful. Something that explains a different transport than PIO will be needed.

OK

Quoted 27 lines

Quoted 18 lines

hw/kvm/pv_event.c new file +2 -0

+}
+#endif

hw/pc_piix.c +3 -0

index 88ff041..f73fb85 100644
@@ -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
 

hw/pc_piix.c static void pc_init1(MemoryRegion *system_memory, · line 292

Quoted 5 lines

hw/pc_piix.c +2 -0

@@ -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

This file is x86-only, and there we have KVM_PV_EVENT_PORT unconditionally. So drop the #ifdef.

Quoted 5 lines

hw/pc_piix.c static void pc_init1(MemoryRegion *system_memory, · line 294

Quoted 2 lines

hw/pc_piix.c +2 -0

+    if (kvm_enabled()) {
+        kvm_pv_event_init(isa_bus);

But you are missing a kvm-stub entry for kvm_pv_event_init. A --disable-kvm build should be broken for that reason.

Hmm, KVM_PV_EVENT_PORT is defined in asm/kvm_para.h, and I include this file only when CONFIG_KVM is defined. So --disable-kvm build does not be broken in my test.

Quoted 1 line

Yeah, but that is a bit ugly and another reason to go for a proper kvm-stub.

Yes, it is ugly. I will add a stub function in kvm-stub. And the header file asm/kvm_para.h can be included unconditionally. And "#ifdef KVM_PV_EVENT_PORT" can be dropped.

Quoted 276 lines

At 08/24/2012 02:21 PM, Jan Kiszka Wrote:

Quoted 275 lines · Wen Congyang

Quoted 273 lines

At 08/23/2012 06:51 PM, Jan Kiszka Wrote:

Quoted 225 lines · Wen Congyang

Quoted 224 lines

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 <[email protected]>

---
 hw/kvm/Makefile.objs |    2 +-
 hw/kvm/pv_event.c    |  190 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/pc_piix.c         |    9 +++
 kvm.h                |    2 +
 4 files changed, 202 insertions(+), 1 deletions(-)
 create mode 100644 hw/kvm/pv_event.c

hw/kvm/Makefile.objs +1 -1

index 226497a..23e3b30 100644
@@ -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

hw/kvm/pv_event.c new file +184 -0

new file mode 100644
index 0000000..c03dd22
@@ -0,0 +1,190 @@
+/*
+ * QEMU KVM support, paravirtual event device
+ *
+ * Copyright Fujitsu, Corp. 2012
+ *
+ * Authors:
+ *     Wen Congyang <[email protected]>
+ *
+ * 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 PVEventAction {
+    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 PVEventAction *conf)
+{
+    if (event == KVM_PV_EVENT_PANICKED) {
+        panicked_perform_action(conf->panicked_action_value);
+    }
+}
+
+static int pv_event_init(struct PVEventAction *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 "hw/isa.h"
+
+typedef struct {
+    ISADevice dev;
+    struct PVEventAction 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);
+}

Quoted 8 lines

hw/kvm/pv_event.c line 188

Quoted 4 lines

hw/kvm/pv_event.c new file +4 -0

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

Some comment that this stub requires an implementation whenever it is actually built would be helpful. Something that explains a different transport than PIO will be needed.

OK

Quoted 27 lines

Quoted 18 lines

hw/kvm/pv_event.c new file +2 -0

+}
+#endif

hw/pc_piix.c +3 -0

index 88ff041..f73fb85 100644
@@ -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
 

hw/pc_piix.c static void pc_init1(MemoryRegion *system_memory, · line 292

Quoted 5 lines

hw/pc_piix.c +2 -0

@@ -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

This file is x86-only, and there we have KVM_PV_EVENT_PORT unconditionally. So drop the #ifdef.

Quoted 5 lines

hw/pc_piix.c static void pc_init1(MemoryRegion *system_memory, · line 294

Quoted 2 lines

hw/pc_piix.c +2 -0

+    if (kvm_enabled()) {
+        kvm_pv_event_init(isa_bus);

But you are missing a kvm-stub entry for kvm_pv_event_init. A --disable-kvm build should be broken for that reason.

Hmm, KVM_PV_EVENT_PORT is defined in asm/kvm_para.h, and I include this file only when CONFIG_KVM is defined. So --disable-kvm build does not be broken in my test.

Quoted 5 lines

Quoted 1 line

Yeah, but that is a bit ugly and another reason to go for a proper kvm-stub.

Yes, it is ugly. I will add a stub function in kvm-stub. And the header file asm/kvm_para.h can be included unconditionally. And "#ifdef KVM_PV_EVENT_PORT" can be dropped.

Actually, not asm/kvm_para.h but linux/kvm_para.h. And you will then only need it in pv_event.c.

Jan