Subject: Re: [PATCH 09/26] KVM: PPC: Add PV guest scratch registers

From: Avi Kivity <[email-masked]>
Date: Sun, 27 Jun 2010 12:53:14 +0300

On 06/27/2010 12:41 PM, Alexander Graf wrote:
>
> Am 27.06.2010 um 10:22 schrieb Avi Kivity <[email-masked]>:
>
>> On 06/26/2010 02:24 AM, Alexander Graf wrote:
>>> While running in hooked code we need to store register contents out 
>>> because
>>> we must not clobber any registers.
>>>
>>> So let's add some fields to the shared page we can just happily 
>>> write to.
>>>
>>>
>>
>> How are these protected during interrupts?
>
> By the 'critical section' bit. When in a critical section (read: using 
> scratch registers), we don't issue interrupts.

Ok.  I thought you needed scratch registers to set up the critical 
section, but you don't.  Neat stuff.

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