linux-kernel - Re: [PATCH] [6/12] x86_64: Early segment setup for VT

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Message-ID: <470E95E9.5060703@zytor.com>
Date:	Thu, 11 Oct 2007 14:30:17 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...e.de>
CC:	zach@...are.com, patches@...-64.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] [6/12] x86_64: Early segment setup for VT

Andi Kleen wrote:
> From: Zachary Amsden <zach@...are.com>
> 
> VT is very picky about when it can enter execution.
> Get all segments setup and get LDT and TR into valid state to allow
> VT execution under VMware and KVM (untested).
> 
> This makes the boot decompression run under VT, which makes it several
> orders of magnitude faster on 64-bit Intel hardware.
> 
> Before, I was seeing times up to a minute or more to decompress a 1.3MB kernel
> on a very fast box.
> 
> Signed-off-by: Zachary Amsden <zach@...are.com>
> Signed-off-by: Andi Kleen <ak@...e.de>
> 

Makes a lot of sense to me.

	-hpa
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