Re: [PATCH] x86: Use entire page for the per-cpu GDT only if paravirt-enabled

[Andy Lutomirski]

On Tue, Sep 29, 2015 at 11:18 AM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> SGDT would be easy to use, and it is logical that it is faster since it reads an internal register.  SIDT does too but unlike the GDT has a secondary limit (it can never be larger than 4096 bytes) and so all limits in the range 4095-65535 are exactly equivalent.
>

Using the IDT limit would have been a great ideal if Intel hadn't
decided to clobber it on every VM exit.

--Andy
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