git: kernel -- x86_64: Do not set reserved bits in CR3.
aggelos at crater.dragonflybsd.org
Mon May 20 12:08:00 PDT 2013
Author: Aggelos Economopoulos <aggelos at dragonflybsd.org>
Date: Mon May 20 20:56:07 2013 +0200
kernel -- x86_64: Do not set reserved bits in CR3.
The x86-64 platform code was setting PG_V, PG_U, and PG_RW bits in the
CR3 register. While the bits were supposed to cleared, Intel and AMD
hardware were ignoring them. Other x86-64 implementations, in
particular the software emulator in Linux's KVM, do check that these
reserved bits are zero.
Fixes issue running DragonFly x86_64 on KVM hosts without
two-dimensional (nested) paging.
Tested on a variety of real hardware (AMD FX(tm)-8150, c2q 6600, others)
and VM configurations (KVM on Intel/AMD hosts, Xen).
Committing-on-behalf-of: Venkatesh Srinivas <vsrinivas at ops101.org>
Reported-by: aggelos@, c.turner1, others.
Testing-by: aggelos@, swildner@, mneumann@, ftigeot@, profmakx@, Enjolras
Summary of changes:
sys/platform/pc64/x86_64/pmap.c | 1 -
sys/platform/pc64/x86_64/vm_machdep.c | 1 -
2 files changed, 2 deletions(-)
DragonFly BSD source repository
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