linux-kernel - Re: [PATCH v19 105/130] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL

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Date: Wed, 17 Apr 2024 00:02:40 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: Binbin Wu <binbin.wu@...ux.intel.com>
Cc: Isaku Yamahata <isaku.yamahata@...el.com>,
	Chao Gao <chao.gao@...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 105/130] KVM: TDX: handle KVM hypercall with
 TDG.VP.VMCALL

On Wed, Apr 17, 2024 at 02:16:57PM +0800,
Binbin Wu <binbin.wu@...ux.intel.com> wrote:

> 
> 
> On 4/4/2024 9:27 AM, Isaku Yamahata wrote:
> > On Tue, Apr 02, 2024 at 04:52:46PM +0800,
> > Chao Gao <chao.gao@...el.com> wrote:
> > 
> > > > +static int tdx_emulate_vmcall(struct kvm_vcpu *vcpu)
> > > > +{
> > > > +	unsigned long nr, a0, a1, a2, a3, ret;
> > > > +
> > > do you need to emulate xen/hyper-v hypercalls here?
> > 
> > No. kvm_emulate_hypercall() handles xen/hyper-v hypercalls,
> > __kvm_emulate_hypercall() doesn't.
> So for TDX, kvm doesn't support xen/hyper-v, right?
> 
> Then, should KVM_CAP_XEN_HVM and KVM_CAP_HYPERV be filtered out for TDX?

That's right. We should update kvm_vm_ioctl_check_extension() and
kvm_vcpu_ioctl_enable_cap().  I didn't pay attention to them.
-- 
Isaku Yamahata <isaku.yamahata@...el.com>