On 1/29/19 5:12 AM, Paul Mackerras wrote: > On Mon, Jan 28, 2019 at 07:26:00PM +0100, Cédric Le Goater wrote: >> >> Is clearing the PTEs and repopulating the VMA unsafe ? > > Actually, now that I come to think of it, there could be any number of > VMAs (well, up to almost 64k of them), since once you have a file > descriptor you can call mmap on it multiple times. > > The more I think about it, the more I think that getting userspace to > manage the mappings with mmap() and munmap() is the right idea if it > can be made to work. We might be able to mmap() and munmap() regions of ESB pages in the RTAS call "ibm,change-msi". I think that's the right spot for it. Thanks, C.
