linux-kernel - Re: [RFC PATCH] KVM: Only print vcpu

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Message-ID: <20120801031930.GB31711@amt.cnet>
Date:	Wed, 1 Aug 2012 00:19:30 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Avi Kivity <avi@...hat.com>, Gleb Natapov <gleb@...hat.com>,
	Joerg Roedel <joerg.roedel@....com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [RFC PATCH] KVM: Only print vcpu_unimpl when DEBUG is set

On Thu, Jul 26, 2012 at 02:22:48PM +0200, Markus Trippelsdorf wrote:
> Every time I start qemu-kvm on my system the following line is added to
> the syslog:
> 
>  vcpu0 unhandled rdmsr: 0xc0010001
> 
> AFAICS all calls to vcpu_unimpl only contain debugging info with little
> or no value for the end user.
> 
> Wouldn't something like the following patch make sense?
> 
> Signed-off-by: Markus Trippelsdorf <markus@...ppelsdorf.de>

It could be useful for debugging (but then lots of other things could).

Anyone has a use for this?

> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index b70b48b..6bd816f 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -321,7 +321,7 @@ struct kvm {
>  #define kvm_debug(fmt, ...) \
>  	pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
>  #define kvm_pr_unimpl(fmt, ...) \
> -	pr_err_ratelimited("kvm [%i]: " fmt, \
> +	pr_debug_ratelimited("kvm [%i]: " fmt, \
>  			   task_tgid_nr(current), ## __VA_ARGS__)
>  
>  /* The guest did something we don't support. */
> 
> -- 
> Markus
> --
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