Re: [PATCH v2 4/8] KVM: TDX: Handle KVM hypercall with TDG.VP.VMCALL

[Sean Christopherson <seanjc@google.com>]

On Tue, Feb 11, 2025, Binbin Wu wrote:
> ---
>  arch/x86/kvm/vmx/tdx.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
> index 420ee492e919..daa49f2ee2b3 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -964,6 +964,23 @@ fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu, bool force_immediate_exit)
>  	return tdx_exit_handlers_fastpath(vcpu);
>  }
>  
> +static int complete_hypercall_exit(struct kvm_vcpu *vcpu)
> +{
> +	tdvmcall_set_return_code(vcpu, vcpu->run->hypercall.ret);
> +	return 1;
> +}
> +
> +static int tdx_emulate_vmcall(struct kvm_vcpu *vcpu)
> +{
> +	kvm_rax_write(vcpu, to_tdx(vcpu)->vp_enter_args.r10);
> +	kvm_rbx_write(vcpu, to_tdx(vcpu)->vp_enter_args.r11);
> +	kvm_rcx_write(vcpu, to_tdx(vcpu)->vp_enter_args.r12);
> +	kvm_rdx_write(vcpu, to_tdx(vcpu)->vp_enter_args.r13);
> +	kvm_rsi_write(vcpu, to_tdx(vcpu)->vp_enter_args.r14);
> +
> +	return __kvm_emulate_hypercall(vcpu, 0, complete_hypercall_exit);

Thanks for persevering through all the ideas and churn, I like how this turned
out!