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Date:   Sun, 24 Oct 2021 20:59:30 +0800
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Subject: Re: [RFC PATCH v2 66/69] KVM: TDX: Add "basic" support for building
 and running Trust Domains
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To:     Sagi Shahar <sagis@google.com>,
        Isaku Yamahata <isaku.yamahata@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H . Peter Anvin" <hpa@zytor.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        Erdem Aktas <erdemaktas@google.com>,
        Connor Kuehl <ckuehl@redhat.com>,
        Sean Christopherson <seanjc@google.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     isaku.yamahata@gmail.com, Kai Huang <kai.huang@linux.intel.com>,
        Chao Gao <chao.gao@intel.com>,
        Isaku Yamahata <isaku.yamahata@linux.intel.com>,
        Yuan Yao <yuan.yao@intel.com>
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From:   Xiaoyao Li <xiaoyao.li@intel.com>
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On 10/22/2021 5:44 AM, Sagi Shahar wrote:
>   On Fri, Jul 2, 2021 at 3:06 PM, Isaku Yamahata
> <isaku.yamahata@intel.com> wrote:
>> Subject: [RFC PATCH v2 66/69] KVM: TDX: Add "basic" support for
>> building and running Trust Domains
>>
>>
>> +static int tdx_map_gpa(struct kvm_vcpu *vcpu)
>> +{
>> +       gpa_t gpa = tdvmcall_p1_read(vcpu);
>> +       gpa_t size = tdvmcall_p2_read(vcpu);
>> +
>> +       if (!IS_ALIGNED(gpa, 4096) || !IS_ALIGNED(size, 4096) ||
>> +           (gpa + size) < gpa ||
>> +           (gpa + size) > vcpu->kvm->arch.gfn_shared_mask << (PAGE_SHIFT + 1))
>> +               tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
>> +       else
>> +               tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS);
>> +
>> +       return 1;
>> +}
> 
> This function looks like a no op in case of success. Is this
> intentional? Is this mapping handled somewhere else later on?
> 

Yes, it's intentional.

The mapping will be exactly set up in EPT violation handler when the GPA 
is really accessed.