Re: [Qemu-devel] [PATCH v4 5/5] kvm/x86: Hyper-V kvm exit

[Paolo Bonzini]

On 18/12/2015 19:10, Peter Hornyack wrote:
> On brief inspection of Andrey's patch (I have not been following
> closely) it looks like the kvm_hyperv_exit struct that's returned to
> userspace contains more data (control, evt_page, and msg_page fields)
> than simply the value of the MSR, so would the desired SynIC exit fit
> into a general-purpose exit for MSR emulation?

This would be a special case that is used even if the hyperv MSRs are
emulated in the kernel.  Other exit subcodes than
KVM_EXIT_(MSR_)HYPERV_SYNIC would be used for your usecase of for MSR
emulation in userspace.

Paolo