RE: [Xen-devel] dom0 pvops crash

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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.

Ian.




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