diff options
| author | Patrick Wildt <patrick@cvs.openbsd.org> | 2019-04-16 14:32:45 +0000 |
|---|---|---|
| committer | Patrick Wildt <patrick@cvs.openbsd.org> | 2019-04-16 14:32:45 +0000 |
| commit | 3a60c52d1d6fc6f3844ad136c7d1d06f94f70437 (patch) | |
| tree | 2b1332fa479dff7ce3c7cc45de99e06710eb63e4 | |
| parent | 4d5e085bc2e781f73e7aad28d88d7b93f5cf0fbb (diff) | |
When entering kernel pages uncached we need to make sure to flush the
caches. If the physical page was previously used by userland it is
likely that this page is still in the cache and writing to the newly
mapped page could result in unexpected behaviour.
ok kettenis@
| -rw-r--r-- | sys/arch/arm64/arm64/pmap.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/arch/arm64/arm64/pmap.c b/sys/arch/arm64/arm64/pmap.c index f0366c8d8c7..59b018eaddc 100644 --- a/sys/arch/arm64/arm64/pmap.c +++ b/sys/arch/arm64/arm64/pmap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.c,v 1.60 2019/02/10 22:45:58 tedu Exp $ */ +/* $OpenBSD: pmap.c,v 1.61 2019/04/16 14:32:44 patrick Exp $ */ /* * Copyright (c) 2008-2009,2014-2016 Dale Rahn <drahn@dalerahn.com> * @@ -650,6 +650,8 @@ _pmap_kenter_pa(vaddr_t va, paddr_t pa, vm_prot_t prot, int flags, int cache) pmap_pte_insert(pted); ttlb_flush(pm, va & ~PAGE_MASK); + if (cache == PMAP_CACHE_CI || cache == PMAP_CACHE_DEV) + cpu_idcache_wbinv_range(va & ~PAGE_MASK, PAGE_SIZE); } void |