CVS commit: src/sys/arch/x86

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

Module Name:    src
Committed By:   ad
Date:           Sun Jan 12 13:01:12 UTC 2020

Modified Files:
        src/sys/arch/x86/include: pmap.h pmap_pv.h
        src/sys/arch/x86/x86: pmap.c vm_machdep.c x86_tlb.c

Log Message:
x86 pmap:

- It turns out that every page the pmap frees is necessarily zeroed.  Tell
  the VM system about this and use the pmap as a source of pre-zeroed pages.

- Redo deferred freeing of PTPs more elegantly, including the integration with
  pmap_remove_all().  This fixes problems with nvmm, and possibly also a crash
  discovered during fuzzing.

Reported-by: syzbot+a97186518c84f1d85c0c%syzkaller.appspotmail.com@localhost


To generate a diff of this commit:
cvs rdiff -u -r1.108 -r1.109 src/sys/arch/x86/include/pmap.h
cvs rdiff -u -r1.9 -r1.10 src/sys/arch/x86/include/pmap_pv.h
cvs rdiff -u -r1.354 -r1.355 src/sys/arch/x86/x86/pmap.c
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/x86/x86/vm_machdep.c
cvs rdiff -u -r1.13 -r1.14 src/sys/arch/x86/x86/x86_tlb.c

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