linux-kernel - Re: [PATCH 3/8] KVM: SVM: Sync cr0 and cr3 to kvm state before nested handling

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Message-Id: <894CCCC7-6E35-499D-9EF6-57A9123B969C@suse.de>
Date:	Fri, 23 Apr 2010 15:50:20 +0200
From:	Alexander Graf <agraf@...e.de>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/8] KVM: SVM: Sync cr0 and cr3 to kvm state before nested handling


On 22.04.2010, at 12:33, Joerg Roedel wrote:

> This patch syncs cr0 and cr3 from the vmcb to the kvm state
> before nested intercept handling is done. This allows to
> simplify the vmexit path.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
> arch/x86/kvm/svm.c |   15 ++++++---------
> 1 files changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index c480d7f..5ad9d80 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -1799,10 +1799,7 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
> 	nested_vmcb->save.gdtr   = vmcb->save.gdtr;
> 	nested_vmcb->save.idtr   = vmcb->save.idtr;
> 	nested_vmcb->save.cr0    = kvm_read_cr0(&svm->vcpu);
> -	if (npt_enabled)
> -		nested_vmcb->save.cr3    = vmcb->save.cr3;
> -	else
> -		nested_vmcb->save.cr3    = svm->vcpu.arch.cr3;
> +	nested_vmcb->save.cr3    = svm->vcpu.arch.cr3;


Why don't we need this anymore again?


Alex

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