Can cuPointerGetAttributes be used to get the host pointer of a device memory?

[JacobHe_AMD]

Greetings,
Is it allowed to get the host pointer of a device memory allocated by cuMemAlloc() via cuPointerGetAttributes? I mean all of the device memories are cpu-visible if PCIE large bar is enabled for discrete GPU, and whole range of the device memory can be mapped into host virtual address space. But I’m not sure if it’s allowed by the cuda driver api spec?

Thanks
Jacob

[Robert_Crovella]

No. There is no host pointer “associated” with device memory.

The pointer you are imagining would have to be acquired by other means.

@JacobHe_AMD

and whole range of the device memory can be mapped into host virtual address space.

So if and when you get that mapping working, at that point you would be able to get a host pointer, based on the mapping mechanism.

[JacobHe_AMD]

@Robert_Crovella

No. There is no host pointer “associated” with device memory.

Got it, thanks for clarification!

-Jacob