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xen-devel
[Xen-devel] Re: [patch 05/21] Xen-paravirt: paravirt_ops: allocate a fix
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To: |
Dan Hecht <dhecht@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [patch 05/21] Xen-paravirt: paravirt_ops: allocate a fixmap slot |
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From: |
Gerd Hoffmann <kraxel@xxxxxxx> |
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Date: |
Wed, 14 Feb 2007 09:43:49 +0100 |
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Cc: |
Andrew Morton <akpm@xxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx> |
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Wed, 14 Feb 2007 00:43:42 -0800 |
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Thunderbird 1.5.0.9 (X11/20060911) |
Dan Hecht wrote:
> Right. But that is only because Xen decides to allocate the page from
> the (machine) physical space, rather than from the pseudo-physical
> space. My question is: why doesn't Xen allocate shared_info from the
> pseudo-physical space?
Historical reasons ...
> If it had, then this page wouldn't need to be
> treated specially. I'm not sure, but I seem to remember on 64-bit
> Xen/XenLinux allocated shared_info from pseudo-physical space already...
Yep, the ia64 port which came later handles some things differently,
specifically some "magic" pages are allocated more clever ;)
Changing that for x86 would break existing guests though.
cheers,
Gerd
--
Gerd Hoffmann <kraxel@xxxxxxx>
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