linux-kernel - Re: [PATCH v5 4/7] kvm, mem-hotplug: Reload L1' apic access page on migration in vcpu_enter

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Message-ID: <20140911101200.GF25317@minantech.com>
Date:	Thu, 11 Sep 2014 13:12:01 +0300
From:	Gleb Natapov <gleb@...nel.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Tang Chen <tangchen@...fujitsu.com>, mtosatti@...hat.com,
	nadav.amit@...il.com, jan.kiszka@....de, kvm@...r.kernel.org,
	laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	guz.fnst@...fujitsu.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/7] kvm, mem-hotplug: Reload L1' apic access page on
 migration in vcpu_enter_guest().

On Thu, Sep 11, 2014 at 11:21:49AM +0200, Paolo Bonzini wrote:
> Il 11/09/2014 07:38, Tang Chen ha scritto:
> > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> > index 63c4c3e..da6d55d 100644
> > --- a/arch/x86/kvm/vmx.c
> > +++ b/arch/x86/kvm/vmx.c
> > @@ -7093,6 +7093,11 @@ static void vmx_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
> >  	vmx_set_msr_bitmap(vcpu);
> >  }
> >  
> > +static void vmx_set_apic_access_page_addr(struct kvm *kvm, hpa_t hpa)
> > +{
> > +	vmcs_write64(APIC_ACCESS_ADDR, hpa);
> 
> This has to be guarded by "if (!is_guest_mode(vcpu))".
> 
We do need to write it if L1 and L2 share APIC_ACCESS_ADDR and skip
it otherwise, no?

> > +}
> > +

--
			Gleb.
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