Re: [RFC PATCH v3 2/2] KVM: x86: Allow Qemu/KVM to use PVH entry point

[Paolo Bonzini]

On 15/12/2017 16:55, Juergen Gross wrote:
> I'm fine with the general idea.
> 
> I'm wondering whether you really want to require CONFIG_XEN for the
> KVM case, though.
> 
> Wouldn't it be better to rename arch/x86/xen/enlighten_pvh.c to
> arch/x86/pvh.c and arch/x86/xen/xen-pvh.S to arch/x86/pvh-head.S,

Yes, sounds good.

> put both under CONFIG_PVH umbrella and select this from CONFIG_XEN_PVH
> and KVM_PVH (or what you like to call it)?

CONFIG_KVM_GUEST will be good enough.

> In the two moved source files you can make Xen/KVM-specific parts
> optional via their CONFIG_ options.
> 
> And you might want to add an own ELF note for the KVM case?

As long as it's compatible with Xen, it's not needed.  Only the startup
code changes between a KVM "PVH" kernel and a KVM "HVM" kernel.

Paolo