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    SubjectRe: [PATCH v13 098/113] KVM: TDX: Handle TDX PV map_gpa hypercall
    From
    > +static int tdx_map_gpa(struct kvm_vcpu *vcpu)
    > +{
    > + struct kvm *kvm = vcpu->kvm;
    > + gpa_t gpa = tdvmcall_a0_read(vcpu);
    > + gpa_t size = tdvmcall_a1_read(vcpu);
    > + gpa_t end = gpa + size;
    > +
    > + if (!IS_ALIGNED(gpa, PAGE_SIZE) || !IS_ALIGNED(size, PAGE_SIZE) ||
    > + end < gpa ||
    > + end > kvm_gfn_shared_mask(kvm) << (PAGE_SHIFT + 1) ||
    > + kvm_is_private_gpa(kvm, gpa) != kvm_is_private_gpa(kvm, end)) {
    > + tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
    > + return 1;
    > + }
    > +
    > + return tdx_vp_vmcall_to_user(vcpu);

    This will result into exits to userspace for MMIO regions as well. Does it make
    sense to only exit to userspace for guest physical memory regions backed by
    memslots?

    > +}
    > +

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