linux-kernel - Re: [RFC PATCH v5 096/104] KVM: TDX: Handle TDX PV rdmsr hypercall

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Date:   Fri, 15 Apr 2022 17:08:21 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     isaku.yamahata@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...il.com, Jim Mattson <jmattson@...gle.com>,
        erdemaktas@...gle.com, Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [RFC PATCH v5 096/104] KVM: TDX: Handle TDX PV rdmsr hypercall

On 3/4/22 20:49, isaku.yamahata@...el.com wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
> Wire up TDX PV rdmsr hypercall to the KVM backend function.
> 
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---
>   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 cec2660206bd..dd7aaa28bf3a 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -1124,6 +1124,23 @@ static int tdx_emulate_mmio(struct kvm_vcpu *vcpu)
>   	return 1;
>   }
>   
> +static int tdx_emulate_rdmsr(struct kvm_vcpu *vcpu)
> +{
> +	u32 index = tdvmcall_p1_read(vcpu);
> +	u64 data;
> +
> +	if (kvm_get_msr(vcpu, index, &data)) {
> +		trace_kvm_msr_read_ex(index);
> +		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
> +		return 1;
> +	}
> +	trace_kvm_msr_read(index, data);
> +
> +	tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS);
> +	tdvmcall_set_return_val(vcpu, data);
> +	return 1;
> +}
> +
>   static int handle_tdvmcall(struct kvm_vcpu *vcpu)
>   {
>   	struct vcpu_tdx *tdx = to_tdx(vcpu);
> @@ -1143,6 +1160,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
>   		return tdx_emulate_io(vcpu);
>   	case EXIT_REASON_EPT_VIOLATION:
>   		return tdx_emulate_mmio(vcpu);
> +	case EXIT_REASON_MSR_READ:
> +		return tdx_emulate_rdmsr(vcpu);
>   	default:
>   		break;
>   	}

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>

and feel free to squash with the wrmsr one.

Paolo