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PR/38699 CVS commit: [netbsd-6] src/sys/arch
The following reply was made to PR port-xen/38699; it has been noted by GNATS.
From: "Jeff Rizzo" <riz%netbsd.org@localhost>
Subject: PR/38699 CVS commit: [netbsd-6] src/sys/arch
Date: Thu, 23 Feb 2012 21:17:25 +0000
Module Name: src
Committed By: riz
Date: Thu Feb 23 21:17:25 UTC 2012
src/sys/arch/x86/x86 [netbsd-6]: pmap.c
src/sys/arch/xen/x86 [netbsd-6]: x86_xpmap.c
Pull up following revision(s) (requested by bouyer in ticket #39):
sys/arch/x86/x86/pmap.c: revision 1.170
sys/arch/xen/x86/x86_xpmap.c: revision 1.40
On Xen, there is variable-sized Xen data after the kernel's text+data+bss
(this include the physical->machine table).
(vaddr_t)(KERNBASE + NKL2_KIMG_ENTRIES * NBPD_L2) is after text+data+bss but,
on a domU with lots of RAM (more than 4GB) (so large
xpmap_phys_to_machine_mapping table) this can point to some of Xen's data
setup at bootstrap (either the xpmap_phys_to_machine_mapping table,
some page shared with the hypervisor, or our kernel page table). Using it for
early_zerop will cause of these pages to be unmapped after bootstrap.
This will cause a kernel page fault for the domU, either immediatly or
eventually much later, depending on where early_zerop points to.
To fix this, account for early_zerop when building the bootstrap pages,
and its VA from here.
May fix PR port-xen/38699
To generate a diff of this commit:
cvs rdiff -u -r126.96.36.199 -r188.8.131.52 src/sys/arch/x86/x86/pmap.c
cvs rdiff -u -r184.108.40.206 -r220.127.116.11 src/sys/arch/xen/x86/x86_xpmap.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
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