linux-kernel - Re: [PATCH] trace-cmd: Report unknown VMX exit reasons with code

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Date:	Fri, 04 Oct 2013 15:40:29 +0200
From:	Jan Kiszka <jan.kiszka@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH] trace-cmd: Report unknown VMX exit reasons with code

On 2013-08-11 09:59, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@...mens.com>
> 
> Allows to parse the result even if the KVM plugin does not yet
> understand a specific exit code.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  plugin_kvm.c |   12 ++++++++----
>  1 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/plugin_kvm.c b/plugin_kvm.c
> index 8a25cf1..59443e5 100644
> --- a/plugin_kvm.c
> +++ b/plugin_kvm.c
> @@ -240,9 +240,8 @@ static const char *find_exit_reason(unsigned isa, int val)
>  	for (i = 0; strings[i].val >= 0; i++)
>  		if (strings[i].val == val)
>  			break;
> -	if (strings[i].str)
> -		return strings[i].str;
> -	return "UNKNOWN";
> +
> +	return strings[i].str;
>  }
>  
>  static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
> @@ -251,6 +250,7 @@ static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
>  	unsigned long long isa;
>  	unsigned long long val;
>  	unsigned long long info1 = 0, info2 = 0;
> +	const char *reason;
>  
>  	if (pevent_get_field_val(s, event, "exit_reason", record, &val, 1) < 0)
>  		return -1;
> @@ -258,7 +258,11 @@ static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
>  	if (pevent_get_field_val(s, event, "isa", record, &isa, 0) < 0)
>  		isa = 1;
>  
> -	trace_seq_printf(s, "reason %s", find_exit_reason(isa, val));
> +	reason = find_exit_reason(isa, val);
> +	if (reason)
> +		trace_seq_printf(s, "reason %s", reason);
> +	else
> +		trace_seq_printf(s, "reason UNKNOWN (%llu)", val);
>  
>  	pevent_print_num_field(s, " rip 0x%lx", event, "guest_rip", record, 1);
>  
> 

Ping. While my other patch of that time was merged, this one didn't make
it yet. Any open issues?

Jan


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