Messages in this thread | | | Subject | Re: [PATCH] x86: Use entire page for the per-cpu GDT only if paravirt-enabled | From | "H. Peter Anvin" <> | Date | Tue, 29 Sep 2015 11:27:01 -0700 |
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Ugh. Didn't realize that.
On September 29, 2015 11:22:04 AM PDT, Andy Lutomirski <luto@amacapital.net> wrote: >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
-- Sent from my Android device with K-9 Mail. Please excuse my brevity.
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