linux-kernel - Re: [PATCH] kvm: Dump guest rIP when the guest tried something unsupported

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Message-ID: <5661A669.8020901@redhat.com>
Date:	Fri, 4 Dec 2015 15:42:49 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Borislav Petkov <bp@...en8.de>, KVM <kvm@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kvm: Dump guest rIP when the guest tried something
 unsupported



On 20/11/2015 19:52, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> It looks like this in action:
> 
>   kvm [5197]: vcpu0, guest rIP: 0xffffffff810187ba unhandled rdmsr: 0xc001102
> 
> and helps to pinpoint quickly where in the guest we did the unsupported
> thing.
> 
> Signed-off-by: Borislav Petkov <bp@...e.de>
> ---
>  include/linux/kvm_host.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 5706a2108f0a..597f6607c440 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -439,7 +439,8 @@ struct kvm {
>  
>  /* The guest did something we don't support. */
>  #define vcpu_unimpl(vcpu, fmt, ...)					\
> -	kvm_pr_unimpl("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
> +	kvm_pr_unimpl("vcpu%i, guest rIP: 0x%lx " fmt,			\
> +			(vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__)
>  
>  #define vcpu_debug(vcpu, fmt, ...)					\
>  	kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
> 

Thanks, applying this to kvm/queue.

Paolo
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