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Date:	Wed, 14 Jul 2010 22:15:32 -0400
From:	Rik van Riel <>
To:	Zachary Amsden <>
CC:	KVM <>, Avi Kivity <>,
	Marcelo Tosatti <>,
	Glauber Costa <>,
	Linux-kernel <>
Subject: Re: [PATCH 11/18] Perform hardware_enable in CPU_STARTING callback

On 07/12/2010 10:25 PM, Zachary Amsden wrote:
> The CPU_STARTING callback was added upstream with the intention
> of being used for KVM, specifically for the hardware enablement
> that must be done before we can run in hardware virt.  It had
> bugs on the x86_64 architecture at the time, where it was called
> after CPU_ONLINE.  The arches have since merged and the bug is
> gone.
> It might be noted other features should probably start making
> use of this callback; microcode updates in particular which
> might be fixing important erratums would be best applied before
> beginning to run user tasks.
> Signed-off-by: Zachary Amsden<>

Reviewed-by: Rik van Riel <>

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