Re: [PATCH 2/4] xen/lowlevel: Implement pvop call for load_idt (sidt).

From: H. Peter Anvin
Date: Thu Oct 18 2012 - 11:02:42 EST

On 10/18/2012 07:45 AM, Konrad Rzeszutek Wilk wrote:

OK... this seems like another excellent set of pvops calls that
should be nukable to Kingdom Come. There is no reason, ever, to
read the IDT and GDT from the kernel... the kernel already knows
what they should be!

Even during suspend and resume cycle? There are the sequence of
sidt/lidt calls being done there. And we do need to filter at
least the sidt call - and in the case of ACPI suspend path,
the lidt.

Yes, I am pretty sure we can make static guarantees on the IDT and GDTs.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

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