Re: [PATCH 2/2] xen/arm: Handle reserved heap pages in boot and heap allocator

[Julien Grall <julien@xxxxxxx>]

Hi Stefano,

On 01/09/2022 18:08, Stefano Stabellini wrote:
> > > Also, what happen with UEFI? Is it easy to guarantee the region will not
> > > be used?
> > For now I think it is not easy to guarantee that, do you have some ideas
> > in mind? I think I can follow this in above follow-up series to improve things.
> For clarity, are we worried that the region is used by the bootloader
> for other things? For instance U-Boot or Tianocore placing some
> firmware tables inside the range specified for xenheap?
Yes. I think it would be difficult for an admin to figure out which 
regions are used. Although they are likely (?) going to be static for a 
given UEFI/U-boot build.
My major concern is such bug can be very difficult to root cause because 
we have no safety in Xen. The most likely symptom would be random 
corruption.
Cheers,

--
Julien Grall