linux-kernel - Re: [PATCH 11/18] Perform hardware_enable in CPU

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Message-ID: <4C3E6F44.4090007@redhat.com>
Date:	Wed, 14 Jul 2010 22:15:32 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Zachary Amsden <zamsden@...hat.com>
CC:	KVM <kvm@...r.kernel.org>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Glauber Costa <glommer@...hat.com>,
	Linux-kernel <linux-kernel@...r.kernel.org>
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<zamsden@...hat.com>

Reviewed-by: Rik van Riel <riel@...hat.com>

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