Re: [Xen-devel] Dom0 crashed with xen4.0 and DEBIAN SQUEEZE AMD64

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 14 Apr 2011, Konrad Rzeszutek Wilk wrote:
> On Wed, Apr 13, 2011 at 10:04:51AM +0300, Pasi KÃrkkÃinen wrote:
> > On Fri, Apr 08, 2011 at 03:33:34PM +0200, RAPHAEL REMONDINI wrote:
> > >    Hi
> > > 
> > >    I have installed xen4.0.1 on DEBIAN SQUEEZE 64 bits with 2.6.32-5 xen
> > >    kernel.
> 
> 
> > > 
> > >    My server is HP PROLIANT DL160 with 16Go RAM with  Intel Xeon Quad Core
> > >    E5504
> > > 
> > >    When start the server on kernel xen hypervisor the system reboot !!!
> > > 
> > 
> > You should try using the latest dom0 kernel from Jeremy's xen.git 
> > xen/stable-2.6.32.x branch and see if that makes a difference.
> > 
> > http://wiki.xen.org/xenwiki/XenParavirtOps
> > 
> > Debian's 2.6.32-5-xen kernel is based on a snapshot from last summer.
> > (although there are some fixes included in the later revisions).
> 

What debian kernel version are you using exactly?


> OK. It looks like you are hitting on a well known bug that ought at some 
> point make
> it in the stable tree. If you would like to get the fix right away we can 
> send you
> the fix and you can compile the kernel yourself.
> 
> Stefano, is the patch in your for-stable-2.6.32.32 OK for folks to use?
> 

Nope.

I think the best thing to do here is reverting "x86-64: finish
cleanup_highmaps()'s job wrt. _brk_end":


commit e90c1e477c2f76f184eefdd8afb21b1c343f24dc
Author: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date:   Thu Apr 14 14:01:50 2011 +0000

    Revert "x86-64: finish cleanup_highmaps()'s job wrt. _brk_end"
    
    This reverts commit 498343967613183611ac37dccb2846496d954c06.

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 73ffd55..3e3d5f9 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -8,7 +8,6 @@
 #include <asm/page.h>
 #include <asm/page_types.h>
 #include <asm/sections.h>
-#include <asm/setup.h>
 #include <asm/system.h>
 #include <asm/tlbflush.h>
 #include <asm/tlb.h>
@@ -288,23 +287,8 @@ unsigned long __init_refok init_memory_mapping(unsigned 
long start,
 #endif
 
 #ifdef CONFIG_X86_64
-       if (!after_bootmem && !start) {
-               pud_t *pud;
-               pmd_t *pmd;
-
+       if (!after_bootmem)
                mmu_cr4_features = read_cr4();
-
-               /*
-                * _brk_end cannot change anymore, but it and _end may be
-                * located on different 2M pages. cleanup_highmap(), however,
-                * can only consider _end when it runs, so destroy any
-                * mappings beyond _brk_end here.
-                */
-               pud = pud_offset(pgd_offset_k(_brk_end), _brk_end);
-               pmd = pmd_offset(pud, _brk_end - 1);
-               while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1))
-                       pmd_clear(pmd);
-       }
 #endif
        __flush_tlb_all();

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