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Re: [Xen-devel] how page faults are handled in paravirtualized xenguests

from [Daniel Stodden] [Permanent Link][Original]
To: weiming <zephyr.zhao@xxxxxxxxx>
Subject: Re: [Xen-devel] how page faults are handled in paravirtualized xenguests?
From: Daniel Stodden <stodden@xxxxxxxxxx>
Date: Tue, 11 Mar 2008 17:27:30 +0100
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, tgh <wwwwww4187@xxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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On Tue, 2008-03-11 at 10:37 -0500, weiming wrote:
> and how can xen tell if the hypercall is from kernel space or user
> space in x86_64?

The VMM simply keeps track of it in software. Starting from kernel mode,
an IRET will return to virtual user mode, a subsequent 'SYSCALL' will
move control back to the kernel.

hth,
daniel

-- 
Daniel Stodden
LRR     -      Lehrstuhl für Rechnertechnik und Rechnerorganisation
Institut für Informatik der TU München             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@xxxxxxxxxx
PGP Fingerprint: F5A4 1575 4C56 E26A 0B33  3D80 457E 82AE B0D8 735B



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