linux-kernel - Re: [kvm-devel] [PATCH 10/13] KVM: Wire up hypercall handlers to a central arch-independent location

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Message-ID: <45DD7271.6000503@qumranet.com>
Date:	Thu, 22 Feb 2007 12:37:37 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Dor Laor <dor.laor@...ranet.com>, Pavel Machek <pavel@....cz>,
	kvm-devel@...ts.sourceforge.net, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH 10/13] KVM: Wire up hypercall handlers to
 a central arch-independent location

Joerg Roedel wrote:
> On Thu, Feb 22, 2007 at 02:17:54AM -0800, Dor Laor wrote:
>   
>> I have Ingo's network PV hypercalls to commit in my piplien.
>> Till then we can just add the test hypercall:
>> 	case __NR_hypercall_test:
>> 		printk(KERN_DEBUG "%s __NR_hypercall_test\n",
>> __FUNCTION__);
>> 		ret = 0x5a5a;
>> 		break;
>> 	default:
>> 		BUG();
>>     
>
> Is it a good idea to call BUG() on an undefined hypercall? I assume its
> better to inform the guest that is has issued an illegal call...
>
>   

The code returns -KVM_EINVAL if the hypercall is not handled (and BUG() 
on the host as a response to something controlled by a guest is not a 
good idea).


-- 
error compiling committee.c: too many arguments to function

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