linux-kernel - use of setjmp/longjmp in x86 emulator.

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Message-ID: <20100301091819.GD16909@redhat.com>
Date:	Mon, 1 Mar 2010 11:18:19 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, avi@...hat.com, mtosatti@...hat.com,
	zamsden@...hat.com
Subject: use of setjmp/longjmp in x86 emulator.

I am looking at improving KVM x86 emulator. Current code does not
handle some special cases correctly (code execution from ROM, ins/outs
to/from MMIO) and many exception conditions during instruction emulation
are not handled correctly. There is a lot of code in emulator that is
there only for exception propagation. Using setjmp/longjmp will be very
beneficial here as exception condition during instruction execution
maps very naturally to setjmp/longjmp, so my question is what about
adding setjmp/longjmp implementation to the kernel, or alternatively,
if there is a fear that it can be abused, add it locally to emulator.c?
Note that instruction emulation is always done in process context.

--
			Gleb.
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