freebsd-dev/sys/powerpc/aim
Conrad Meyer 4ae224c663 Revert r240317 to prevent leaking pmap entries
Subsequent to r240317, kmem_free() was replaced with kva_free() (r254025).
kva_free() releases the KVA allocation for the mapped region, but no longer
clears the pmap (pagetable) entries.

An affected pmap_unmapdev operation would leave the still-pmap'd VA space
free for allocation by other KVA consumers.  However, this bug easily
avoided notice for ~7 years because most devices (1) never call
pmap_unmapdev and (2) on amd64, mostly fit within the DMAP and do not need
KVA allocations.  Other affected arch are less popular: i386, MIPS, and
PowerPC.  Arm64, arm32, and riscv are not affected.

Reported by:	Don Morris <dgmorris AT earthlink.net>
Submitted by:	Don Morris (amd64 part)
Reviewed by:	kib, markj, Don (!amd64 parts)
MFC after:	I don't intend to, but you might want to
Sponsored by:	Dell Isilon
Differential Revision:	https://reviews.freebsd.org/D25689
2020-07-16 23:29:26 +00:00
..
aim_machdep.c powerpc: Handle machine checks caused by D-ERAT multihit 2020-05-21 03:33:20 +00:00
locore32.S
locore64.S
locore.S
mmu_oea64.c Revert r240317 to prevent leaking pmap entries 2020-07-16 23:29:26 +00:00
mmu_oea64.h powerpc/mmu: Convert PowerPC pmap drivers to ifunc from kobj 2020-05-27 01:24:12 +00:00
mmu_oea.c Revert r240317 to prevent leaking pmap entries 2020-07-16 23:29:26 +00:00
mmu_radix.c Revert r240317 to prevent leaking pmap entries 2020-07-16 23:29:26 +00:00
moea64_native.c powerpc/mmu: Convert PowerPC pmap drivers to ifunc from kobj 2020-05-27 01:24:12 +00:00
mp_cpudep.c
slb.c
trap_subr32.S [PowerPC] Fix invalid asm in trap code 2020-05-27 00:17:05 +00:00
trap_subr64.S powerpc: Add a (CPU/runtime features) flags set to pcpu struct 2020-06-06 02:40:52 +00:00