Re: [Xen-devel] [PATCH v4 11/39] altp2m: Move (MAX|INVALID)_ALTP2M to xen/p2m-common.h

[Sergej Proskurin <proskurin@xxxxxxxxxxxxx>]

Hi Jan,


On 08/31/2017 10:04 AM, Jan Beulich wrote:
>>>> On 30.08.17 at 20:32, <proskurin@xxxxxxxxxxxxx> wrote:
>> We move the macros (MAX|INVALID)_ALTP2M out of x86-related code to
>> common code, as the following patches will make use of them on ARM.
> But both seem not impossible to be require arch-specific values.

Right. The general idea at this point is to move as much of altp2m
functionality/configuration as possible into a common place. Yet, if you
believe that, e.g., the number of altp2m views could/should diverge
between both architectures, I will gladly move the defines back into
arch-related parts. However, we need to consider that while x86/Intel
supports up to 512 entries for EPT pointers as part of the VMCS, we are
quite flexible on ARM: we manage the views entirely in software and
hence on ARM we can easily keep up with Intel's specification. This
allows us to hold parts of the altp2m configuration in a unified place.
Or do you believe this is not the right way to go?

Thanks,
~Sergej


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