Re: [PATCH 1/2] i386/xen: Move KVM_XEN_HVM_CONFIG ioctl to kvm_xen_init_vcpu()

[Sean Christopherson <seanjc@xxxxxxxxxx>]

On Fri, Feb 07, 2025, David Woodhouse wrote:
> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
> 
> At the time kvm_xen_init() is called, hyperv_enabled() doesn't yet work, so
> the correct MSR index to use for the hypercall page isn't known.
> 
> Rather than setting it to the default and then shifting it later for the
> Hyper-V case with a confusing second call to kvm_init_xen(), just do it
> once in kvm_xen_init_vcpu().

Is it possible the funky double-init is deliberate, to ensure that Xen is
configured in KVM during VM setup?  I looked through KVM and didn't see any
obvious dependencies, but that doesn't mean a whole lot.