Quoting David Matlack (2024-03-14 22:11:57) [...] > > 7. Use the PT_AT_4GIB knob in s390's CMMA test? I suspect it does memslot > > shenanigans purely so that a low gfn (4096 in the test) is guaranteed to > > be available. > > +Nico > > Hm, if this test _needs_ to use GFN 4096, then maybe the framework can > give tests two regions 0..KVM_FRAMEWORK_GPA and TEST_GPA..MAX. > > If the test just needs any GFN then it can use TEST_GPA instead of > 4096 << page_shift. Sorry for the late reply, this got burried at the bottom of my inbox :( The test creates two memslots with a gap in between to be able to test that gaps in memslots are correctly skipped by the CMMA-related ioctls. The test doesn't need GFN 4096. It should not matter where TEST_GPA is, as long as there's a gap after the main memslot. Feel free to include me on a follow-up, then I can test and look at this.
