Messages in this thread | | | From | Andy Lutomirski <> | Date | Tue, 29 Sep 2015 11:22:04 -0700 | Subject | Re: [PATCH] x86: Use entire page for the per-cpu GDT only if paravirt-enabled |
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On Tue, Sep 29, 2015 at 11:18 AM, H. Peter Anvin <hpa@zytor.com> 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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