linux-kernel - Re: [PATCH 2/6] KVM: SVM: Add manipulation functions for CRx intercepts

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Date:	Thu, 2 Dec 2010 14:43:50 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Avi Kivity <avi@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] KVM: SVM: Add manipulation functions for CRx
 intercepts

On Tue, Nov 30, 2010 at 06:03:57PM +0100, Joerg Roedel wrote:
> This patch wraps changes to the CRx intercepts of SVM into
> seperate functions to abstract nested-svm better and prepare
> the implementation of the vmcb-clean-bits feature.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/include/asm/svm.h |   15 +++--
>  arch/x86/kvm/svm.c         |  119 +++++++++++++++++++++++---------------------
>  2 files changed, 72 insertions(+), 62 deletions(-)
> 

> -	control->intercept_cr_read =	INTERCEPT_CR0_MASK |
> -					INTERCEPT_CR3_MASK |
> -					INTERCEPT_CR4_MASK;
> -
> -	control->intercept_cr_write =	INTERCEPT_CR0_MASK |
> -					INTERCEPT_CR3_MASK |
> -					INTERCEPT_CR4_MASK |
> -					INTERCEPT_CR8_MASK;
> +	set_cr_intercept(svm, INTERCEPT_CR0_READ);
> +	set_cr_intercept(svm, INTERCEPT_CR3_READ);
> +	set_cr_intercept(svm, INTERCEPT_CR4_READ);
> +	set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
> +	set_cr_intercept(svm, INTERCEPT_CR3_WRITE);
> +	set_cr_intercept(svm, INTERCEPT_CR4_WRITE);
> +	set_cr_intercept(svm, INTERCEPT_CR8_WRITE);

Should clear hflags before using is_guest_mode().

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