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xen-devel
[Xen-devel] [PATCH 0/4] xen: critical bug fixes for 2.6.39-rc3
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<linux-kernel@xxxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] [PATCH 0/4] xen: critical bug fixes for 2.6.39-rc3 |
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From: |
Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> |
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Date: |
Tue, 12 Apr 2011 12:16:20 +0100 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Stefano, Ingo Molnar <mingo@xxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>, Yinghai Lu <yinghai@xxxxxxxxxx> |
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Tue, 12 Apr 2011 04:16:52 -0700 |
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Alpine 2.00 (DEB 1167 2008-08-23) |
Hi all,
this is a small collection of critical xen bug fixes for 2.6.39-rc3:
the recent changes to the initial kernel pagetable allocation mechanism
(4b239f458c229de044d6905c2b0f9fe16ed9e01e in particular) caused a number
of issues on Xen.
This patch series fixes those issues and it is required just to boot a
2.6.39 linux kernel as regular xen guest.
The list of patches with a diffstat follows:
Stefano Stabellini (4):
xen: mask_rw_pte mark RO all pagetable pages up to pgt_buf_top
x86,xen: introduce x86_init.mapping.pagetable_reserve
xen: more debugging in the e820 parsing
xen: do not create the extra e820 region at an addr lower than 4G
arch/x86/include/asm/pgtable_types.h | 1 +
arch/x86/include/asm/x86_init.h | 9 +++++++++
arch/x86/kernel/x86_init.c | 4 ++++
arch/x86/mm/init.c | 9 +++++++--
arch/x86/xen/mmu.c | 17 ++++++++++++++++-
arch/x86/xen/setup.c | 6 +++++-
6 files changed, 42 insertions(+), 4 deletions(-)
The first two commits make sure pagetable pages are marked RO while
other pages are marked RW.
The third commit adds a couple of useful debugging statements.
The fourth commit fixes a boot crash on xen when booting as initial
domain: the xen extra memory region shouldn't start below 4G otherwise
e820_end_of_low_ram_pfn() could return an address above 4G. As a
consequence init_memory_mapping would end up mapping MMIO regions
without going through the fixmap.
A git branch with this series is available here:
git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.39-rc3-fixes
Comments are welcome.
- Stefano
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