Re: [Xen-ia64-devel] RE: VTI will crash with memory=3073M

[Tristan Gingold <tgingold@xxxxxxx>]

On Wed, Sep 24, 2008 at 02:07:35PM +0900, Isaku Yamahata wrote:
[...]
> Hi.
> 
> I looked into the issue a bit.
> EFI_PEI_SERVICE funciton pointers are located on the stack for PEI.
> Its service should be available until DxeIpl done and it is surely
> used.
> However if the stack page happens to be reused during DxeIpl, the 
> function pointers are overwritten. Then guest panic occurs the next
> time the pei service is called via this function pointers which
> don't contain correct value.
> 
> Pei page allocate seems to depend on initial memory layout so that
> which cases fail/pass depends on the allocator.
> 
> Hmm, the right solution looks like that
> - prevent the stack page from being allocated until DxeIPL done.
> - (Optionally) free the page after DxeIpl done.
>   Probably at the beginning of Dxe.

Thank you for the analysis.  This makes sense.  I have to re-read the PI
spec but I think you can mark memory as reserved by PI.

Tristan.

> 
> thanks
> -- 
> yamahata

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