Re: [Minios-devel] [UNIKRAFT PATCHv4 21/43] plat/kvm: Add Arm64 basic entry code

[Julien Grall <julien.grall@xxxxxxx>]

Hi Wei,

On 20/07/2018 08:16, Wei Chen wrote:
> >         - What is the state of the memory at that time? You probably want to
> > follow what Image says: "The address range corresponding to the loaded
> > kernel image must be cleaned to PoC".
> At the very beginning, I assume QEMU had help me sync the image memory to PoU
> at least. Because guest will read image bypass the cache.
IHMO Point of Unification is far too weak for booting in a VM. This only 
tells you that the instruction cache, data cache, translation walks will 
have the same view. You don't know if the result has reached the memory 
and may not see it when MMU and cache is disabled. You want Point of 
Coherency here.
Anyway, in both case, you have to be careful when writing with MMU and 
cache off. So I would expect the boot code to contain cache maintenance 
in the next version.
Cheers,

--
Julien Grall

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