linux-kernel - Re: [PATCH 12/14] KVM: x86 emulator

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Message-ID: <20061107124912.GA23118@elf.ucw.cz>
Date:	Tue, 7 Nov 2006 13:49:12 +0100
From:	Pavel Machek <pavel@....cz>
To:	Avi Kivity <avi@...ranet.com>
Cc:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	akpm@...l.org
Subject: Re: [PATCH 12/14] KVM: x86 emulator

HI!

> Add an x86 instruction emulator for kvm.
> 
> We need an x86 emulator for the following reasons:
> 
> - mmio instructions are intercepted as page faults, with no information about
>   the operation to be performed other than the virtual address
> - real-mode is emulated using the old-fashined vm86 mode, with no special
>   intercepts for the privileged instructions, so we need to emulate mov cr,
>   lgdt, and lidt
> - we plan to cache shadow page tables in the future, so that a guest context
>   switch will not throw away all the mappings we worked so hard to build.  but
>   cachine page tables means write-protecting the guest page tables to keep
>   them in sync, so any writes to the guest page tables need to be emulated
> 
> The emulator was lifted from the Xen hypervisor.
> 
> Signed-off-by: Yaniv Kamay <yaniv@...ranet.com>
> Signed-off-by: Avi Kivity <avi@...ranet.com>
> 
> Index: linux-2.6/drivers/kvm/x86_emulate.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6/drivers/kvm/x86_emulate.c
> @@ -0,0 +1,1370 @@
> +/******************************************************************************
> + * x86_emulate.c
> + *
> + * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
> + *
> + * Copyright (c) 2005 Keir Fraser
> + *
> + * Linux coding style, mod r/m decoder, segment base fixes, real-mode
> + * privieged instructions:
> + *
> + * Copyright (C) 2006 Qumranet
> + *
> + *   Avi Kivity <avi@...ranet.com>
> + *   Yaniv Kamay <yaniv@...ranet.com>
> + *
> + * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
> + */

This needs GPL, I'd say.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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