From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: Re: [PATCH 02/23] KVM: PPC: Book3S PR: Don't corrupt guest state when kernel uses VMX
Date: Thu, 08 Aug 2013 21:19:50 +0530
Message-ID: <87ob98p4gx.fsf@linux.vnet.ibm.com>
References: <20130806041259.GF19254@iris.ozlabs.ibm.com> <20130806041433.GH19254@iris.ozlabs.ibm.com>
Mime-Version: 1.0
Content-Type: text/plain
Cc: kvm-ppc@vger.kernel.org, kvm@vger.kernel.org
To: Paul Mackerras <paulus@samba.org>, Alexander Graf <agraf@suse.de>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Return-path: <kvm-ppc-owner@vger.kernel.org>
In-Reply-To: <20130806041433.GH19254@iris.ozlabs.ibm.com>
Sender: kvm-ppc-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

Paul Mackerras <paulus@samba.org> writes:

> @@ -575,8 +577,6 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
>  	printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
>  #endif
>  
> -	current->thread.regs->msr |= msr;
> -
>  	if (msr & MSR_FP) {
>  		for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
>  			thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
> @@ -598,12 +598,32 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
>  #endif
>  	}
>  
> +	current->thread.regs->msr |= msr;
>  	vcpu->arch.guest_owned_ext |= msr;
>  	kvmppc_recalc_shadow_msr(vcpu);
>  
>  	return RESUME_GUEST;
>  }

Any specific reason you are doing the above ?

-aneesh