CVS commit: src/sys/arch

["Andrew Doran" <ad%netbsd.org@localhost>]

Module Name:    src
Committed By:   ad
Date:           Sun Dec 15 19:24:11 UTC 2019

Modified Files:
        src/sys/arch/x86/include: pmap.h
        src/sys/arch/x86/x86: pmap.c
        src/sys/arch/xen/x86: xen_pmap.c

Log Message:
uvm_pagerealloc() can now block because of radixtree manipulation, so defer
freeing PTPs until pmap_unmap_ptes(), where we still have the pmap locked
but can finally tolerate context switches again.

To be revisited soon: pmap_map_ptes() seems broken WRT other pmap load.

Reported-by: syzbot+689fb7dab41abff8e75a%syzkaller.appspotmail.com@localhost
Reported-by: syzbot+3e7bbf37d37d451b25d7%syzkaller.appspotmail.com@localhost
Reported-by: syzbot+689fb7dab41abff8e75a%syzkaller.appspotmail.com@localhost
Reported-by: syzbot+689fb7dab41abff8e75a%syzkaller.appspotmail.com@localhost
Reported-by: syzbot+3e7bbf37d37d451b25d7%syzkaller.appspotmail.com@localhost


To generate a diff of this commit:
cvs rdiff -u -r1.106 -r1.107 src/sys/arch/x86/include/pmap.h
cvs rdiff -u -r1.343 -r1.344 src/sys/arch/x86/x86/pmap.c
cvs rdiff -u -r1.33 -r1.34 src/sys/arch/xen/x86/xen_pmap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.