linux-kernel - Re: [PATCH 0/7] KVM: Kernel-based Virtual Machine

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Message-ID: <20061025164227.GA5675@ucw.cz>
Date:	Wed, 25 Oct 2006 16:42:27 +0000
From:	Pavel Machek <pavel@....cz>
To:	Christoph Hellwig <hch@...radead.org>,
	Avi Kivity <avi@...ranet.com>, Arnd Bergmann <arnd@...db.de>,
	Muli Ben-Yehuda <muli@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Anthony Liguori <aliguori@...ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 0/7] KVM: Kernel-based Virtual Machine

Hi!

> > >What is the point of 32 bit hosts anyway? Isn't this only available
> > >on x86_64 type CPUs in the first place?
> > >  
> > 
> > No, 32-bit hosts are fully supported (except a 32-bit host can't run a 
> > 32-bit guest).
> 
> Again, what's the point?  All cpus shipped by Intel and AMD that have
> hardware virtualization extensions also support the 64bit mode.  Given
> that I don't see any point for supporting a 32bit host.

If you have 1GB ram, having 64-bit capable cpu does not mean you want
to run 64-bit kernel. Pointers are twice as big, etc... And if your
shiny new cpu fails, you can't put hdd back in good old working
machine.

(IOW I see reasons. Not sure if they are big enough...)
							Pavel
-- 
Thanks for all the (sleeping) penguins.
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