From: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
To: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Cc: kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
carsteno-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org,
Shaohua Li <shaoh.li-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [RFC]kvm: swapout guest page
Date: Mon, 21 May 2007 14:38:54 +0200 [thread overview]
Message-ID: <465192DE.3000902@de.ibm.com> (raw)
In-Reply-To: <46516466.9030904-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Avi Kivity wrote:
> For one thing, kvm uses page->private to store its rmap information.
> This is lost if regular mappings are used.
>
> More importantly, both the regular address space and kvm will want to be
> called when a page is paged out, while this is doable, it isn't easy.
Taking the long way to call kvm on pageout seems to be preferable. On
390 we don't need any callback when a page is swapped out. Actually
the pte is invalidated and next time the guest accesses that page we
receive a page fault which causes us to swap it back in. Would you
explain why that callback is needed on x86?
so long,
Carsten
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next prev parent reply other threads:[~2007-05-21 12:38 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-21 8:12 [RFC]kvm: swapout guest page Shaohua Li
[not found] ` <288dbef70705210112t710bc904pe546840f7b9cfcfa-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-05-21 8:43 ` Dor Laor
2007-05-21 9:17 ` Carsten Otte
[not found] ` <46516392.6070402-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
2007-05-21 9:20 ` Avi Kivity
[not found] ` <46516466.9030904-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-05-21 12:38 ` Carsten Otte [this message]
[not found] ` <465192DE.3000902-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
2007-05-21 13:31 ` Avi Kivity
[not found] ` <46519F32.7020808-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-05-21 14:07 ` Carsten Otte
[not found] ` <4651A7A4.9040702-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
2007-05-21 14:35 ` Avi Kivity
[not found] ` <4651AE3F.8060603-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-05-21 14:41 ` Carsten Otte
[not found] ` <4651AFA6.2060605-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
2007-05-21 14:43 ` Avi Kivity
[not found] ` <4651AFF7.2080107-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-05-22 15:10 ` Carsten Otte
2007-05-21 11:51 ` Christoph Hellwig
2007-05-21 9:17 ` Avi Kivity
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