linux-kernel - Re: [PATCH 7/7 v6] deal with panicked event accoring to '-machine panic

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Date:	Fri, 06 Jul 2012 13:09:47 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Wen Congyang <wency@...fujitsu.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 7/7 v6] deal with panicked event accoring to '-machine
 panic_action=action'

On 2012-07-06 11:41, Wen Congyang wrote:
> The action is the same as -onpanic parameter.

As explained in patch 5, now that we have a related device, this no
longer needs to be a machine property.

Would could be a machine property is enabling/disabling this device.
That's probably useful as it uses a fixed PIO port that might conflict
with (non-Linux) guest expectations and/or future device models.

Jan

> 
> Signed-off-by: Wen Congyang <wency@...fujitsu.com>
> ---
>  qemu-config.c   |    4 ++++
>  qemu-options.hx |    4 +++-
>  vl.c            |    7 +++++++
>  3 files changed, 14 insertions(+), 1 deletions(-)
> 
> diff --git a/qemu-config.c b/qemu-config.c
> index 5c3296b..805e7c4 100644
> --- a/qemu-config.c
> +++ b/qemu-config.c
> @@ -595,6 +595,10 @@ static QemuOptsList qemu_machine_opts = {
>              .name = "dt_compatible",
>              .type = QEMU_OPT_STRING,
>              .help = "Overrides the \"compatible\" property of the dt root node",
> +        }, {
> +            .name = "panic_action",
> +            .type = QEMU_OPT_STRING,
> +            .help = "The action what QEMU will do when the guest is panicked",
>          },
>          { /* End of list */ }
>      },
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 4a061bf..083a21d 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -33,7 +33,9 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
>      "                property accel=accel1[:accel2[:...]] selects accelerator\n"
>      "                supported accelerators are kvm, xen, tcg (default: tcg)\n"
>      "                kernel_irqchip=on|off controls accelerated irqchip support\n"
> -    "                kvm_shadow_mem=size of KVM shadow MMU\n",
> +    "                kvm_shadow_mem=size of KVM shadow MMU\n"
> +    "                panic_action=none|pause|poweroff|reset controls what QEmu\n"
> +    "                will do when the guest is panicked",
>      QEMU_ARCH_ALL)
>  STEXI
>  @item -machine [type=]@var{name}[,prop=@...{value}[,...]]
> diff --git a/vl.c b/vl.c
> index 1a68257..091c43b 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -2301,6 +2301,7 @@ int main(int argc, char **argv, char **envp)
>      };
>      const char *trace_events = NULL;
>      const char *trace_file = NULL;
> +    const char *panic_action = NULL;
>  
>      atexit(qemu_run_exit_notifiers);
>      error_set_progname(argv[0]);
> @@ -3372,10 +3373,16 @@ int main(int argc, char **argv, char **envp)
>          kernel_filename = qemu_opt_get(machine_opts, "kernel");
>          initrd_filename = qemu_opt_get(machine_opts, "initrd");
>          kernel_cmdline = qemu_opt_get(machine_opts, "append");
> +        panic_action = qemu_opt_get(machine_opts, "panic_action");
>      } else {
>          kernel_filename = initrd_filename = kernel_cmdline = NULL;
>      }
>  
> +    if (panic_action && select_panicked_action(panic_action) == -1) {
> +        fprintf(stderr, "Unknown -panic_action parameter\n");
> +        exit(1);
> +    }
> +
>      if (!kernel_cmdline) {
>          kernel_cmdline = "";
>      }
> 

-- 
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux


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