WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] dom0 pvops crash

On Mon, Jan 25, 2010 at 06:26:26PM +0000, Ian Campbell wrote:
> On Mon, 2010-01-25 at 18:18 +0000, Ian Pratt wrote:
> > > Here's the hacky fix from last summer:
> > > http://lists.xensource.com/archives/html/xen-devel/2009-06/msg00519.html
> > > 
> > > On my testbox I can trigger that bug just by compiling a kernel in dom0.
> > > 
> > > CONFIG_HIGHPTE=n is stable for me, while CONFIG_HIGHPTE=y most probably
> > > makes dom0 crash during a kernel compile.
> > > 
> > > (dom0 and Xen are 32bit PAE)
> > 
> > Even if it worked reliably, CONFIG_HIGHPTE performance would be
> > miserable: It takes an operation that is always going to be slow on
> > any virtualized system (updating PTEs), and pounds the cr*p out of
> > it...
> 
> Unfortunately distros tend to enable it on native and with pvops there
> is often no separate Xen kernel build where it can be disabled.
> 

I just noticed the default Fedora 12 32bit PAE kernel has CONFIG_HIGHPTE=y.
Running simple "make -j2 bzImage && make -j2 modules" in the guest crashes the 
kernel.

Some kind of workaround should be made..

-- Pasi


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>