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[Xen-devel] Re: [RFC PATCH 17/35] Segment register changes for Xen

from [Zachary Amsden] [Permanent Link][Original]
To: Chris Wright <chrisw@xxxxxxxxxxxx>
Subject: [Xen-devel] Re: [RFC PATCH 17/35] Segment register changes for Xen
From: Zachary Amsden <zach@xxxxxxxxxx>
Date: Wed, 22 Mar 2006 16:16:54 -0800
Cc: virtualization@xxxxxxxxxxxxxx, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>
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Chris Wright wrote:

1. We clear FS/GS before changing TLS entries and switching LDT, as
otherwise the hypervisor will fail to restore thread-local values on
return to the guest kernel and we take a slow exception path.
This should not be needed. You should clear FS/GS that match updated descriptors in your descriptor validation code instead. And you will get better performance for both native and the hypervisor cases. 

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