I took this from "linux-next" (where it was tagged with 'next-20200923') as:
~/linux-next$ git show a02b55ea66b9
commit a02b55ea66b9257744528da609a26279152a3bc3
Author: Vasily Gorbik <[email protected]>
Date: Wed Sep 23 09:49:28 2020 +1000
mm/gup: fix gup_fast with dynamic page table folding
Currently to make sure that every page table entry is read just once
gup_fast walks perform READ_ONCE and pass pXd value down to the next
gup_pXd_range function by value e.g.:
static int gup_pud_range(p4d_t p4d, unsigned long addr, unsigned long end,
unsigned int flags, struct page **pages, int *nr)
...
and built a patched groovy and a patched focal kernel, available here:
https://people.canonical.com/~fheimes/lp1896726/
Do you have a chance giving these a try?
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https://bugs.launchpad.net/bugs/1896726
Title:
[UBUNTU 20.04.1] qemu (secure guest) crash due to gup_fast / dynamic
page table folding issue
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