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From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Sina Bahram <sbahram@nc.rr.com>,
	xen-devel@lists.xensource.com, xen-research@lists.xensource.com
Subject: Re: Implementing split memory in Xen is annoyingly hard?
Date: Fri, 12 Dec 2008 09:19:58 +0000	[thread overview]
Message-ID: <C567DD3E.20260%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <F6A8BB752F6C474389D6F79CF966CDFE@neutrino>

On 12/12/2008 06:47, "Sina Bahram" <sbahram@nc.rr.com> wrote:

> #2: Xen absolutely does not, (can not?), cause a fault or other VM exit to
> be generated upon an execute or a read of a page.

It's not possible to make a page executable but not readable, so indeed I
think you're stumped there, unless you can work out a hackish way to
desynchronise the iTLB and the dTLB (an operation not supported
architecturally by x86 of course).

 -- Keir

  reply	other threads:[~2008-12-12  9:19 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-12  6:47 Implementing split memory in Xen is annoyingly hard? Sina Bahram
2008-12-12  9:19 ` Keir Fraser [this message]
2008-12-12  9:50   ` Sina Bahram
2008-12-12  9:54     ` Keir Fraser
2008-12-12 14:49       ` Sina Bahram
2008-12-12 10:23 ` Tim Deegan
2008-12-12 10:40 ` Christopher Head
2008-12-12 15:01   ` Sina Bahram
2008-12-12 15:42   ` Sina Bahram

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