linux-kernel - Re: [kvm-devel] [PATCH] Refactor hypercall infrastructure (v2)

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Message-ID: <4752C1E0.7080104@qumranet.com>
Date:	Sun, 02 Dec 2007 16:32:00 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Amit Shah <amit.shah@...ranet.com>
CC:	kvm-devel@...ts.sourceforge.net,
	Anthony Liguori <aliguori@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH] Refactor hypercall infrastructure (v2)

Amit Shah wrote:
> * Anthony Liguori wrote:
>   
>> This patch refactors the current hypercall infrastructure to better support
>> live migration and SMP.  It eliminates the hypercall page by trapping the
>> UD exception that would occur if you used the wrong hypercall instruction
>> for the underlying architecture and replacing it with the right one lazily.
>>     
>
> This doesn't work right for SVM. It keeps looping indefinitely; on a kvm_stat 
> run, I get about 230,000 light vm exits per second, with the hypercall never 
> returning to the guest.
>   

I just tested kvm.git with (the new) hypercall.flat testcase.  Seems to 
work fine.

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

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