linux-kernel - Re: [PATCH] Bugfix for VMI paravirt ops

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Date:	Thu, 05 Apr 2007 17:20:30 -0700
From:	Zachary Amsden <zach@...are.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [PATCH] Bugfix for VMI paravirt ops

Jeremy Fitzhardinge wrote:
> Zachary Amsden wrote:
>   
>> No, they are totally dependent.  The reason interrupts are disabled is
>> to stop kmap_atomic in interrupt handlers.  With the kmap_atomic_pte
>> changes, the whole interrupt disable jibberish goes away. 
>>     
>
> But kmap_atomic_pte is a special case of kmap_atomic for ptes. 
> Interrupt routines can still use plain kmap_atomic for bouncebuffers and
> so on.
>   

Ah, yes.

> A more general patch would be to make kmap/unmap_atomic pv_ops, and then
> they can all be rolled together.  I.e: check the type to see if special
> pte handling needs to happen, etc.
>   

So the clean fix for this is still even further out.  I don't think I 
want to hook kmap/unmap as paravirt-ops.

Zach
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