[kvmarm] [PATCH v2] ARM: KVM: lazy save/restore of vfp/neon

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On Tue, 24 Jul 2012 18:51:23 +0200, Antonios Motakis <a.motakis at virtualopensystems.com> wrote:
>  Hello all,
> 
> So I had another look into vfp_hard_struct. The struct seems to be
> different depending on what version of VFP we have compiled the kernel to
> support (if at all), in particular the number of registers. I have designed
> the current so it doesn't rely on the host's VFP support; in theory you
> would be able to run VFP guests without including any support in the host
> (similarly to how on PC you can run 64bit guests on 32bit hosts).

Ah, yes, you can actually configure a kernel without VFP support.  I
suppose in theory we should then prevent the guest from using VFP too,
in that case.

But it's such a corner case, I'd not bother.  Perhaps make it a struct
rather than an array + enum, but that's very minor.

Cheers,
Rusty.


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