Re: [PATCH 0 of 3] RFC: creating a particular vcpu type

[Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

Why do this at the VCPU level?  Would you ever want a VM with two VCPUs 
with different cores?  You could just add a per-VM arch ioctl to set the 
core type that has to be issued before any VCPU creates.  Then you don't 
have to do ugly stuff like calling ioctls from modules.

Regards,

Anthony Liguori

Hollis Blanchard wrote:
> These patches allow PowerPC to create vcpus of a particular type. Since we are
> actually emulating the core's supervisor mode, we can choose to emulate any
> type of core. However, since the core chosen will change the size of the vcpu
> structure (among other things), we need to know it at vcpu creation time,
> rather than after the fact (which is how x86's cpuid is handled).
>
> I've included the first example of how PowerPC will be using the new
> capability, and this will be significantly extended in the future. I think you
> get the idea...
>
> I still need to update my tree and patch IA64 to match, but is this approach
> acceptable?
>
> 6 files changed, 99 insertions(+), 11 deletions(-)
> arch/powerpc/kvm/powerpc.c     |   80 ++++++++++++++++++++++++++++++++++++++--
> arch/x86/kvm/x86.c             |    4 +-
> include/asm-powerpc/kvm_host.h |    5 ++
> include/linux/kvm.h            |    8 ++++
> include/linux/kvm_host.h       |    4 +-
> virt/kvm/kvm_main.c            |    9 ++--
>
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