[Xen-ia64-devel] Re: PATCH: all registers in vcpu_guest_context

[Tristan Gingold <tgingold@xxxxxxx>]

On Tue, May 29, 2007 at 03:54:32PM -0600, Alex Williamson wrote:
> Hi Tristan,
> 
>    Looks like this patch is causing some problems:
> 
> http://xenbits.xensource.com/ext/xen-ia64-unstable.hg?rev/7c176473786b
> 
> Most of my machines work with it, but one fails to boot dom0.  That box
> gets a NaT consumption fault with an IIP well above xen text space.  If
> I chop the rbs array off the end of the vcpu_guest_context_regs it boots
> fine.  This gets the structure down to a little over 5k.  I see several
> places where this structure is allocated on the stack.  Are we blowing
> up the stack with a 21k+ structure?  Suggestions for a fix?  Thanks,
This seems to be a good reason.
As a work-around, you may #if 0 the rbs array because it is not yet used.

After a look the structure is allocated on the stack at two places: when a
vcpu is started (PV and VTi).  Do you confirm ?
Because this is not performance critical, we can xmalloc it in these cases.

Tristan.

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