Re: [Xen-devel] [PATCH v9 01/11] xen: introduce SHUTDOWN_soft_reset shutdown reason

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Jul 16, 2015 at 06:27:16PM +0200, Vitaly Kuznetsov wrote:
> This special type of shutdown is supposed to be used by PVHVM guests when
> they want to perform some sort of kexec/kdump.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
> Changes since v8:
> - describe the expected behavior for 'soft reset' [Ian Jackson]
> ---
>  xen/common/shutdown.c      |  6 ++++++
>  xen/include/public/sched.h | 11 ++++++++++-
>  2 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/common/shutdown.c b/xen/common/shutdown.c
> index 9cfbf7a..03a8641 100644
> --- a/xen/common/shutdown.c
> +++ b/xen/common/shutdown.c
> @@ -66,6 +66,12 @@ void hwdom_shutdown(u8 reason)
>          machine_restart(0);
>          break; /* not reached */
>  
> +    case SHUTDOWN_soft_reset:
> +        printk("Hardware domain %d did unsupported soft reset, rebooting.\n",
> +               hardware_domain->domain_id);
> +        machine_restart(0);
> +        break; /* not reached */
> +
>      default:
>          printk("Hardware Dom%u shutdown (unknown reason %u): ",
>                 hardware_domain->domain_id, reason);
> diff --git a/xen/include/public/sched.h b/xen/include/public/sched.h
> index 4000ac9..b91bb9b 100644
> --- a/xen/include/public/sched.h
> +++ b/xen/include/public/sched.h
> @@ -159,7 +159,16 @@ DEFINE_XEN_GUEST_HANDLE(sched_watchdog_t);
>  #define SHUTDOWN_suspend    2  /* Clean up, save suspend info, kill.         
> */
>  #define SHUTDOWN_crash      3  /* Tell controller we've crashed.             
> */
>  #define SHUTDOWN_watchdog   4  /* Restart because watchdog time expired.     
> */
> -#define SHUTDOWN_MAX        4  /* Maximum valid shutdown reason.             
> */
> +
> +/*
> + * Domain asked to perform 'soft reset' for it. The expected behavior is to
> + * reset internal Xen state for the domain returning it to the point where it
> + * was created but leaving the domain's memory and vCPU contexts intact. This
> + * will allow the domain to start over and set up all Xen specific interfaces
> + * again.
> + */
> +#define SHUTDOWN_soft_reset 5
> +#define SHUTDOWN_MAX        5  /* Maximum valid shutdown reason.             
> */
>  /* ` } */
>  
>  #endif /* __XEN_PUBLIC_SCHED_H__ */
> -- 
> 2.4.3
> 

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