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    Subject[PATCH v19 109/130] KVM: TDX: Handle TDX PV port io hypercall
    Date
    From: Isaku Yamahata <isaku.yamahata@intel.com>

    Wire up TDX PV port IO hypercall to the KVM backend function.

    Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
    Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
    ---
    v18:
    - Fix out case to set R10 and R11 correctly when user space handled port
    out.
    ---
    arch/x86/kvm/vmx/tdx.c | 67 ++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 67 insertions(+)

    diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
    index a2caf2ae838c..55fc6cc6c816 100644
    --- a/arch/x86/kvm/vmx/tdx.c
    +++ b/arch/x86/kvm/vmx/tdx.c
    @@ -1152,6 +1152,71 @@ static int tdx_emulate_hlt(struct kvm_vcpu *vcpu)
    return kvm_emulate_halt_noskip(vcpu);
    }

    +static int tdx_complete_pio_out(struct kvm_vcpu *vcpu)
    +{
    + tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS);
    + tdvmcall_set_return_val(vcpu, 0);
    + return 1;
    +}
    +
    +static int tdx_complete_pio_in(struct kvm_vcpu *vcpu)
    +{
    + struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
    + unsigned long val = 0;
    + int ret;
    +
    + WARN_ON_ONCE(vcpu->arch.pio.count != 1);
    +
    + ret = ctxt->ops->pio_in_emulated(ctxt, vcpu->arch.pio.size,
    + vcpu->arch.pio.port, &val, 1);
    + WARN_ON_ONCE(!ret);
    +
    + tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS);
    + tdvmcall_set_return_val(vcpu, val);
    +
    + return 1;
    +}
    +
    +static int tdx_emulate_io(struct kvm_vcpu *vcpu)
    +{
    + struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
    + unsigned long val = 0;
    + unsigned int port;
    + int size, ret;
    + bool write;
    +
    + ++vcpu->stat.io_exits;
    +
    + size = tdvmcall_a0_read(vcpu);
    + write = tdvmcall_a1_read(vcpu);
    + port = tdvmcall_a2_read(vcpu);
    +
    + if (size != 1 && size != 2 && size != 4) {
    + tdvmcall_set_return_code(vcpu, TDVMCALL_INVALID_OPERAND);
    + return 1;
    + }
    +
    + if (write) {
    + val = tdvmcall_a3_read(vcpu);
    + ret = ctxt->ops->pio_out_emulated(ctxt, size, port, &val, 1);
    +
    + /* No need for a complete_userspace_io callback. */
    + vcpu->arch.pio.count = 0;
    + } else
    + ret = ctxt->ops->pio_in_emulated(ctxt, size, port, &val, 1);
    +
    + if (ret)
    + tdvmcall_set_return_val(vcpu, val);
    + else {
    + if (write)
    + vcpu->arch.complete_userspace_io = tdx_complete_pio_out;
    + else
    + vcpu->arch.complete_userspace_io = tdx_complete_pio_in;
    + }
    +
    + return ret;
    +}
    +
    static int handle_tdvmcall(struct kvm_vcpu *vcpu)
    {
    if (tdvmcall_exit_type(vcpu))
    @@ -1162,6 +1227,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
    return tdx_emulate_cpuid(vcpu);
    case EXIT_REASON_HLT:
    return tdx_emulate_hlt(vcpu);
    + case EXIT_REASON_IO_INSTRUCTION:
    + return tdx_emulate_io(vcpu);
    default:
    break;
    }
    --
    2.25.1

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