x86_64: Early segment setup for VT

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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@vmware.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Zachary Amsden 2007-08-10 22:31:05 +02:00 • committed by Linus Torvalds

parent ab144f5ec6

commit 08da5a2ca4

1 changed files with 7 additions and 0 deletions

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arch/x86_64/boot/compressed/head.S

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