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RE: [Xen-devel] Re: [PATCH] Xen Guest Kexec

To: "Gerd Hoffmann" <kraxel@xxxxxxx>, "Mark Williamson" <mark.williamson@xxxxxxxxxxxx>
Subject: RE: [Xen-devel] Re: [PATCH] Xen Guest Kexec
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Sun, 26 Feb 2006 22:49:38 -0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Horms <horms@xxxxxxxxxxxx>
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Thread-topic: [Xen-devel] Re: [PATCH] Xen Guest Kexec
> Also switching page tables seems to be not so easy.  Is it 
> possible to switch atomically to a new, completely 
> independant page table tree?
> i.e. old tree is valid (of cource), new tree is too, but the 
> pages of the old tree are not mapped read-only in the new 
> tree (and visa versa).

If the pagetable you're running on isn't pinned the refcounts will drop
to zero when you switch away from it, hence its only necessary for the
destination pagetable to be internally consistent.


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