Re: [PATCH 0/4] Add support for XMM fast hypercalls

[Paolo Bonzini]

On 08/04/21 17:28, Wei Liu wrote:
> > Although the Hyper-v TLFS mentions that a guest cannot use this feature
> > unless the hypervisor advertises support for it, some hypercalls which
> > we plan on upstreaming in future uses them anyway.
>
> No, please don't do this. Check the feature bit(s) before you issue
> hypercalls which rely on the extended interface.

Perhaps Siddharth should clarify this, but I read it as Hyper-V being 
buggy and using XMM arguments unconditionally.

Paolo