the pagers are all destroyed when linux thinks there is no process left,
but there is no synchronisation with mcexec on that and some new process
might have spawned and started using these pagers in the meantime,
leading to weird crashes because an invalid pager was used.
The reason we're cleaning up pagers when no process is left is that
mcctrl does not handle pager_req_release is the linux-side process got
killed or died before the mckernel one for some reason, so:
- move pager_req_release to a new __do_in_kernel_irq_syscall() helper
- have free_all_process_memory_range not set MF_HOST_RELEASED on the
memobj
- just in case, clean up everything like before on mcctrl shutdown
instead of when no process is left.
Change-Id: I53b8b9b81b1e5b807593850af17b5ea5e8471174
Refs: #1154
vfs_read has been unexported in bd8df82be66 ("fs: unexport vfs_read and vfs_write")
in kernel 4.14.
kernel_read has always™ existed and is actually more appropriate: we can
remove the set_fs calls that are done in kernel_read.
The downside is that the function prototype also changed in 4.14 with
bdd1d2d3d251 ("fs: fix kernel_read prototype")...
(same with kernel_write e13ec939e96b ("fs: fix kernel_write prototype"))
Change-Id: I6f76a6387ae02b4d33bd62952d995a90b1952fc9
Instead of parsing System.map, use kallsyms_lookup_name() to
get unexported symbols addresses at module loading time.
This lets mckernel work with kaslr enabled (it gets enabled by
default from el7.5 onwards)
Change-Id: Ie4349fc1145ebce44f37f1f40c16f9d75584074d
vma is part of vmf and isn't needed, so type changed (see linux 11bac80
("mm, fs: reduce fault, [...] to take only vmf"))
Change-Id: I4c023e23c7e7416ad2df2dcc0698a0032e574e4c
See linux's commit 0ee931c4 ("mm: treewide: remove GFP_TEMPORARY
allocation flag") for a long explanation, but basically that flag
"is just cargo cult" and should be removed
Change-Id: I2147cd65b6b9ec509a72e11cc3abf1fe1561c10b
