What is HIV1 and HIV2

HIV-1 and HIV-2 are two different viruses. HIV-1 is the main family of HIV and accounts for 95% of all infections worldwide. HIV-2 is mainly seen in a few West African countries. The spread in the rest of the world is negligible.  Although HIV-2 generally progresses more slowly than HIV-1, some HIV drugs do not work against HIV-2.

And what Bhavna said is correct, you will NOT be allowed to work in Saudi if you have HIV.   To get a residence permit, you will undergo a medical and if the test is positive, you will be deported and banned.  I would advise you to tell your employer immediately so that they are aware.  I am also surprised that they didn't make you do a medical test before issuing visa - unless they have issued you a business visa and not a work visa; in which case it is illegal to work on that visa.