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

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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




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