Message-ID: <46EFCE2A.1020105@qumranet.com>
Date: Tue, 18 Sep 2007 15:10:02 +0200
From: Avi Kivity <avi@qumranet.com>
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To: Anthony Liguori <aliguori@us.ibm.com>
CC: kvm-devel@lists.sourceforge.net, Zachary Amsden <zach@vmware.com>,
       linux-kernel@vger.kernel.org, Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [kvm-devel] [PATCH 2/3] Refactor hypercall infrastructure (v3)
References: <1190059071649-git-send-email-aliguori@us.ibm.com> <11900590723438-git-send-email-aliguori@us.ibm.com>
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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.
>
> It also introduces the infrastructure to probe for hypercall available via
> CPUID leaves 0x40000000.  CPUID leaf 0x40000001 should be filled out by
> userspace.
>
> A fall-out of this patch is that the unhandled hypercalls no longer trap to
> userspace.  There is very little reason though to use a hypercall to communicate
> with userspace as PIO or MMIO can be used.  There is no code in tree that uses
> userspace hypercalls.
>
>   


Surprisingly, this patch kills Windows XP (ACPI HAL).  I'll try to find 
out why.


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

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