linux-kernel - Re: [PATCH v19 125/130] KVM: TDX: Add methods to ignore virtual apic related operation

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Date: Mon, 22 Apr 2024 10:34:15 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: Binbin Wu <binbin.wu@...ux.intel.com>
Cc: isaku.yamahata@...el.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, isaku.yamahata@...il.com,
	Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
	Sean Christopherson <seanjc@...gle.com>,
	Sagi Shahar <sagis@...gle.com>, Kai Huang <kai.huang@...el.com>,
	chen.bo@...el.com, hang.yuan@...el.com, tina.zhang@...el.com,
	isaku.yamahata@...ux.intel.com
Subject: Re: [PATCH v19 125/130] KVM: TDX: Add methods to ignore virtual apic
 related operation

On Mon, Apr 22, 2024 at 09:56:05AM +0800,
Binbin Wu <binbin.wu@...ux.intel.com> wrote:

> 
> 
> On 2/26/2024 4:27 PM, isaku.yamahata@...el.com wrote:
> > From: Isaku Yamahata <isaku.yamahata@...el.com>
> > 
> > TDX protects TDX guest APIC state from VMM.  Implement access methods of
> > TDX guest vAPIC state to ignore them or return zero.
> > 
> > Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> > ---
> >   arch/x86/kvm/vmx/main.c    | 61 ++++++++++++++++++++++++++++++++++----
> >   arch/x86/kvm/vmx/tdx.c     |  6 ++++
> >   arch/x86/kvm/vmx/x86_ops.h |  3 ++
> >   3 files changed, 64 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
> > index fae5a3668361..c46c860be0f2 100644
> > --- a/arch/x86/kvm/vmx/main.c
> > +++ b/arch/x86/kvm/vmx/main.c
> > @@ -352,6 +352,14 @@ static bool vt_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
> >   	return vmx_apic_init_signal_blocked(vcpu);
> >   }
> > +static void vt_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
> > +{
> > +	if (is_td_vcpu(vcpu))
> > +		return tdx_set_virtual_apic_mode(vcpu);
> Can open code this function...

Yes, the function is empty currently.
-- 
Isaku Yamahata <isaku.yamahata@...el.com>