From: "Jan Beulich" <jbeulich@novell.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: xen-devel@lists.xensource.com
Subject: c/s 19576 vs. AMD systems
Date: Wed, 29 Apr 2009 09:53:01 +0100 [thread overview]
Message-ID: <49F8318D.76EA.0078.0@novell.com> (raw)
Keir,
I'm afraid this change is going to hurt on AMD systems where memory extends
beyond the 4Gb boundary: Both such systems that I have direct access to
have their Intel MTRRs only defined up to the 4Gb boundary, yet through
the use of AMD specific MSRs (SYS_CFG.Tom2ForceMemTypeWB and TOM2)
the default memory type for everything beyond the 4Gb boundary is WB.
On these systems there shouldn't be any clipping. I certainly can put together
a patch for this, but it'll take me a couple of days until I'd get to it.
Jan
next reply other threads:[~2009-04-29 8:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-29 8:53 Jan Beulich [this message]
2009-04-29 9:43 ` c/s 19576 vs. AMD systems Keir Fraser
2009-04-29 10:27 ` Jan Beulich
2009-04-29 10:49 ` Keir Fraser
2009-04-29 17:23 ` Frank Arnold
2009-04-30 6:58 ` Jan Beulich
2009-04-30 6:59 ` Keir Fraser
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