Re: Expose support for HyperV features via QMP

[Alex Bennée]

"manish.mishra" <manish.mishra@nutanix.com> writes:

> Hi Everyone,
>
> Checking if there is any feedback on this.

I've expanded the CC list to some relevant maintainers and people who
have touched that code in case this was missed.

> Thanks
>
> Manish Mishra
>
> On 31/01/23 8:17 pm, manish.mishra wrote:
>
>  Hi Everyone,
>  I hope everyone is doing great. We wanted to check why we do not expose 
> support for HyperV features in
>  Qemu similar to what we do for normal CPU features via query-cpu-defs or 
> cpu-model-expansion QMP
>  commands. This support is required for live migration with HyperV features 
> as hyperv passthrough is not
>  an option. If users had knowledge of what features are supported by source 
> and destination, VM can be
>  started with an intersection of features supported by both source and 
> destination.
>  If there is no specific reason for not doing this, does it make sense to add 
> a new QMP which expose
>  support (internally also validating with KVM or KVM_GET_SUPPORTED_HV_CPUID 
> ioctl) for HyperV
>  features.
>  Apologies in advance if i misunderstood something.
>
>  Thanks
>
>  Manish Mishra


-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro