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Re: [Xen-devel] ARMv8 vs ARMv7

On Wed, 2014-08-20 at 09:59 +0200, Eric SAGNARD wrote:
> Hi, 
> I am looking for informations about differences between virtualization
> on ARMv7 and on ARMv8. 
> Independently of instruction set differences and some different setup
> mechanisms, are there functional differences between ARMv7 hw
> virtualization mechanism and ARMv8 ones ? ARMv8 AArch32 is said to be
> fully compliant with ARMv7.

There is a chapter/appendix towards the back of the ARMv8 ARM which
lists the differences between ARMv7 and ARMv8-AArch32, but they are
pretty minor IIRC.

>  From that fact, I would imagine it is correct to conclude that both
> virtualization mechanism are fully compatible. Is that assumption
> correct ? Is there some new feature available on ARMv8 that would make
> this architecture more interesting regarding virtualization ?

They are pretty similar and Xen's support for ARMv7 and ARMv8 is pretty
much identical.

I expect most of the differences will be in the future e.g. GICv3 only
seems to be appearing on v8 systems etc. Obviously v8 supports larger
RAM and things like that.


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