Messages in this thread | | | Subject | Re: [PATCH 0/4] Add support for XMM fast hypercalls | Date | Thu, 8 Apr 2021 17:54:43 +0200 | From | Siddharth Chandrasekaran <> |
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On Thu, Apr 08, 2021 at 05:48:19PM +0200, Paolo Bonzini wrote: > On 08/04/21 17:40, Siddharth Chandrasekaran 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. > > The guest is at fault here as it expects Hyper-V to consume arguments > > from XMM registers for certain hypercalls (that we are working) even if > > we didn't expose the feature via CPUID bits. > > What guest is that?
It is a Windows Server 2016.
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