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    Subject[PATCH v10 099/108] KVM: TDX: Handle TDX PV rdmsr/wrmsr hypercall
    Date
    From: Isaku Yamahata <isaku.yamahata@intel.com>

    Wire up TDX PV rdmsr/wrmsr hypercall to the KVM backend function.

    Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
    Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
    ---
    arch/x86/kvm/vmx/tdx.c | 39 +++++++++++++++++++++++++++++++++++++++
    1 file changed, 39 insertions(+)

    diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
    index b820475ce0ab..e3062c245e70 100644
    --- a/arch/x86/kvm/vmx/tdx.c
    +++ b/arch/x86/kvm/vmx/tdx.c
    @@ -1033,6 +1033,41 @@ static int tdx_emulate_mmio(struct kvm_vcpu *vcpu)
    return 1;
    }

    +static int tdx_emulate_rdmsr(struct kvm_vcpu *vcpu)
    +{
    + u32 index = tdvmcall_a0_read(vcpu);
    + u64 data;
    +
    + if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ) ||
    + 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 tdx_emulate_wrmsr(struct kvm_vcpu *vcpu)
    +{
    + u32 index = tdvmcall_a0_read(vcpu);
    + u64 data = tdvmcall_a1_read(vcpu);
    +
    + if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE) ||
    + kvm_set_msr(vcpu, index, data)) {
    + trace_kvm_msr_write_ex(index, data);
    + tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
    + return 1;
    + }
    +
    + trace_kvm_msr_write(index, data);
    + tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS);
    + return 1;
    +}
    +
    static int handle_tdvmcall(struct kvm_vcpu *vcpu)
    {
    if (tdvmcall_exit_type(vcpu))
    @@ -1047,6 +1082,10 @@ 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);
    + case EXIT_REASON_MSR_WRITE:
    + return tdx_emulate_wrmsr(vcpu);
    default:
    break;
    }
    --
    2.25.1
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