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SubjectRe: [RFC PATCH 17/35] Segment register changes for Xen
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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