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

[Zachary Amsden <zach@xxxxxxxxxx>]

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.
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel