linux-kernel - Re: [PATCH v2.2] KVM: SVM: Add support for AMD's OSVW feature in guests

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Message-ID: <20120110124052.GB31611@amt.cnet>
Date:	Tue, 10 Jan 2012 10:40:52 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Boris Ostrovsky <ostr@...64.org>
Cc:	avi@...hat.com, Joerg.Roedel@....com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, boris.ostrovsky@....com
Subject: Re: [PATCH v2.2] KVM: SVM: Add support for AMD's OSVW feature in
 guests

On Mon, Jan 09, 2012 at 02:00:35PM -0500, Boris Ostrovsky wrote:
> From: Boris Ostrovsky <boris.ostrovsky@....com>
> 
> In some cases guests should not provide workarounds for errata even when the
> physical processor is affected. For example, because of erratum 400 on family
> 10h processors a Linux guest will read an MSR (resulting in VMEXIT) before
> going to idle in order to avoid getting stuck in a non-C0 state. This is not
> necessary: HLT and IO instructions are intercepted and therefore there is no
> reason for erratum 400 workaround in the guest.
> 
> This patch allows us to present a guest with certain errata as fixed,
> regardless of the state of actual hardware.
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@....com>

Applied, thanks.

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