Re: [Qemu-devel] Fw: Qemu-ga : Guest Agent : Win 2008 -64bit not working

[Pengfei Hu]

I found the same problem occur at Win7. At vioserial\app\device.app:
BOOL CDevice::Init(BOOL ovrl)
{
    PWCHAR DevicePath = NULL;
    if ((DevicePath = GetDevicePath((LPGUID)&GUID_VIOSERIAL_PORT)) != NULL)
    {
        m_hDevice = CreateFile(DevicePath,
                             GENERIC_WRITE | GENERIC_READ,
                             0,
                             NULL,
                             OPEN_EXISTING,
                             ovrl ? FILE_FLAG_OVERLAPPED : 
FILE_ATTRIBUTE_NORMAL,
                             NULL );

        if (m_hDevice != INVALID_HANDLE_VALUE)
        {
            printf("Open vioserial device  %S.\n", DevicePath);
            return TRUE;
        }

    }
    DWORD err = GetLastError();
    printf("Cannot find vioserial device. %S , error = %d\n", DevicePath, 
err );
    return FALSE;
}

GetLastError return 5. This mean not enough privilege. Running with 
administrator will solve this problem. Or you may run "qemu-ga -s install" to 
install as a service.