KAISER: hiding the kernel from user space [LWN.net]

KAISER: hiding the kernel from user space

Posted Nov 15, 2017 11:25 UTC (Wed) by ballombe (subscriber, #9523)
Parent article: KAISER: hiding the kernel from user space

> Since the beginning, Linux has mapped the kernel's memory into the address space of every running process.

IIRC this is not true on SPARC, is it ?

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Posted Nov 15, 2017 14:05 UTC (Wed) by arjan (subscriber, #36785) [Link] (4 responses)

I think you might mean s390

Posted Nov 15, 2017 14:56 UTC (Wed) by cborni (subscriber, #12949) [Link] (3 responses)

I think both SPARC (I am sure about Solaris, but not Linux) and s390 (here I am sure for Linux) have separate kernel and user address spaces.

Posted Nov 16, 2017 2:06 UTC (Thu) by jamesmorris (subscriber, #82698) [Link]

Correct for SPARC. The user and kernel address spaces are separate.

Posted Nov 16, 2017 2:10 UTC (Thu) by jamesmorris (subscriber, #82698) [Link] (1 responses)

Also, it's an architectural feature, so it's true on Linux.

Posted Nov 16, 2017 12:52 UTC (Thu) by ballombe (subscriber, #9523) [Link]

So maybe pushing this will motivate architecture designers to provide this feature, like it was done for virtualization.