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    Subject[PATCH v12 6/8] introduce a new qom device to deal with panicked event
    Date
    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>
    Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
    ---
    hw/kvm/Makefile.objs | 2 +-
    hw/kvm/pv_event.c | 197 +++++++++++++++++++++++++++++++++++++++++++++++++++
    hw/pc_piix.c | 5 ++
    kvm-stub.c | 4 ++
    kvm.h | 2 +
    5 files changed, 209 insertions(+), 1 deletion(-)
    create mode 100644 hw/kvm/pv_event.c

    diff --git a/hw/kvm/Makefile.objs b/hw/kvm/Makefile.objs
    index f620d7f..cf93199 100644
    --- a/hw/kvm/Makefile.objs
    +++ b/hw/kvm/Makefile.objs
    @@ -1 +1 @@
    -obj-$(CONFIG_KVM) += clock.o apic.o i8259.o ioapic.o i8254.o pci-assign.o
    +obj-$(CONFIG_KVM) += clock.o apic.o i8259.o ioapic.o i8254.o pci-assign.o pv_event.o
    diff --git a/hw/kvm/pv_event.c b/hw/kvm/pv_event.c
    new file mode 100644
    index 0000000..112491e
    --- /dev/null
    +++ b/hw/kvm/pv_event.c
    @@ -0,0 +1,197 @@
    +/*
    + * 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 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, hwaddr addr, unsigned size)
    +{
    + return supported_event();
    +}
    +
    +static void pv_io_write(void *opaque, hwaddr 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);
    +}
    +
    +#else
    +
    +/*
    + * If you need a qom device to handle pv event, this device should
    + * be created and initialized in kvm_pv_event_init().
    + *
    + * The parameter opaque is the device's parent bus.
    + */
    +void kvm_pv_event_init(void *opaque)
    +{
    +}
    +#endif
    diff --git a/hw/pc_piix.c b/hw/pc_piix.c
    index cfa839c..8380702 100644
    --- a/hw/pc_piix.c
    +++ b/hw/pc_piix.c
    @@ -47,6 +47,7 @@
    #ifdef CONFIG_XEN
    # include <xen/hvm/hvm_info_table.h>
    #endif
    +#include <linux/kvm_para.h>

    #define MAX_IDE_BUS 2

    @@ -286,6 +287,10 @@ static void pc_init1(MemoryRegion *system_memory,
    if (pci_enabled) {
    pc_pci_device_init(pci_bus);
    }
    +
    + if (kvm_enabled()) {
    + kvm_pv_event_init(isa_bus);
    + }
    }

    static void pc_init_pci(QEMUMachineInitArgs *args)
    diff --git a/kvm-stub.c b/kvm-stub.c
    index a3455e2..c9cfe4a 100644
    --- a/kvm-stub.c
    +++ b/kvm-stub.c
    @@ -140,3 +140,7 @@ int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, int virq)
    {
    return -ENOSYS;
    }
    +
    +void kvm_pv_event_init(void *opaque)
    +{
    +}
    diff --git a/kvm.h b/kvm.h
    index 1e7f244..a4a0795 100644
    --- a/kvm.h
    +++ b/kvm.h
    @@ -275,4 +275,6 @@ void kvm_irqchip_release_virq(KVMState *s, int virq);

    int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n, int virq);
    int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, int virq);
    +
    +void kvm_pv_event_init(void *opaque);
    #endif
    --
    1.8.0.1.240.ge8a1f5a


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