linux-kernel - Re: [PATCH 2/4] xen/lowlevel: Implement pvop call for load

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Message-ID: <50801A14.5010003@zytor.com>
Date:	Thu, 18 Oct 2012 08:02:44 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	lenb@...nel.org, linux-acpi@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 2/4] xen/lowlevel: Implement pvop call for load_idt (sidt).

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.

	-hpa

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

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