linux-kernel - Re: [PATCH 5/6 v5] deal with guest panicked event accoring to -onpanic parameter

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Message-ID: <4FEBB044.1000306@cn.fujitsu.com>
Date:	Thu, 28 Jun 2012 09:15:48 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
CC:	kvm list <kvm@...r.kernel.org>, qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [PATCH 5/6 v5] deal with guest panicked event accoring to -onpanic
 parameter

At 06/27/2012 10:39 PM, Jan Kiszka Wrote:
> On 2012-06-27 09:02, Wen Congyang wrote:
>> When the guest is panicked, it will write 0x1 to the port KVM_PV_PORT.
>> So if qemu reads 0x1 from this port, we can do the folloing three
>> things according to the parameter -onpanic:
>> 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
>>
>> 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@...fujitsu.com>
>> ---
>>  kvm-all.c       |  101 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>  kvm-stub.c      |    9 +++++
>>  kvm.h           |    3 ++
>>  qemu-options.hx |   15 ++++++++
>>  vl.c            |   10 +++++
>>  5 files changed, 138 insertions(+), 0 deletions(-)
>>
>> diff --git a/kvm-all.c b/kvm-all.c
>> index f8e4328..9494dd2 100644
>> --- a/kvm-all.c
>> +++ b/kvm-all.c
>> @@ -19,6 +19,8 @@
>>  #include <stdarg.h>
>>  
>>  #include <linux/kvm.h>
>> +#include <linux/kvm_para.h>
>> +#include <asm/kvm_para.h>
>>  
>>  #include "qemu-common.h"
>>  #include "qemu-barrier.h"
>> @@ -32,6 +34,9 @@
>>  #include "bswap.h"
>>  #include "memory.h"
>>  #include "exec-memory.h"
>> +#include "iorange.h"
>> +#include "qemu-objects.h"
>> +#include "monitor.h"
>>  
>>  /* This check must be after config-host.h is included */
>>  #ifdef CONFIG_EVENTFD
>> @@ -1931,3 +1936,99 @@ int kvm_on_sigbus(int code, void *addr)
>>  {
>>      return kvm_arch_on_sigbus(code, addr);
>>  }
>> +
>> +/* 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 */
>> +
>> +static int panicked_action = PANICKED_REPORT;
>> +
>> +static void kvm_pv_port_read(IORange *iorange, uint64_t offset, unsigned width,
>> +                             uint64_t *data)
>> +{
>> +    *data = (1 << KVM_PV_FEATURE_PANICKED);
>> +}
>> +
>> +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(void)
>> +{
>> +    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");
>> +        exit(0);
>> +        break;
>> +    case PANICKED_RESET:
>> +        panicked_mon_event("reset");
>> +        qemu_system_reset_request();
>> +        break;
>> +    }
>> +}
>> +
>> +static void kvm_pv_port_write(IORange *iorange, uint64_t offset, unsigned width,
>> +                              uint64_t data)
>> +{
>> +    if (data == KVM_PV_PANICKED) {
>> +        panicked_perform_action();
>> +    }
>> +}
>> +
>> +static void kvm_pv_port_destructor(IORange *iorange)
>> +{
>> +    g_free(iorange);
>> +}
>> +
>> +static IORangeOps pv_io_range_ops = {
>> +    .read = kvm_pv_port_read,
>> +    .write = kvm_pv_port_write,
>> +    .destructor = kvm_pv_port_destructor,
>> +};
>> +
>> +#if defined(KVM_PV_PORT)
>> +void kvm_pv_port_init(void)
>> +{
>> +    IORange *pv_io_range = g_malloc(sizeof(IORange));
>> +
>> +    iorange_init(pv_io_range, &pv_io_range_ops, KVM_PV_PORT, 1);
>> +    ioport_register(pv_io_range);
> 
> This modeling is still not ok. We don't open-code ports anymore, we
> introduce devices. And this doesn't belong inro generic code as it is

Do you mean introducing a new device instead of I/O port?

Thanks
Wen Congyang

> x86-only. Will avoid that #ifdef as well.
> 
> Thanks
> Jan
> 

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