[PATCH 0/4][RFC] kvmppc: paravirtualization interface - guest part v2

[ehrhardt@linux.vnet.ibm.com]

From: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>

This patch series implements a paravirtualization interface using:
- the device tree mechanism to pass hypervisor informations to the guest
- hypercalls for guest->host calls
- an example exploiter of that interface (magic page)

Version 2 includes changes to the feedback of my last submission and is now
tested against the implemented and working host part. The host part discussion
can be found on kvm-ppc@vger.kernel.org.

The used hypercall ABI was already discussed on the embedded-hypervisor mailing
list and is available at http://kvm.qumranet.com/kvmwiki/PowerPC_Hypercall_ABI

The device tree format used here (=base for the discussions on
embedded-hypervisor) is the following.
- A node "hypervisor" to show the general availability of some hypervisor data
- flags for features like the example "feature,pv-magicpage"
  setting 1 = available, everything else = unavailable
- Some features might need to pass more data and can use an entry in the
  device tree like the example of "data,pv-magicpage-size"

I hope that eventually this guest patch series (that is modifying the boot
process and adding e.g. new ppc fixmaps could go upstream (when discussed
and agreed somewhen) via linuxppc-dev, while the kvm host part will go via
kvm (Avi Kivity).

[patches in series]
[PATCH 1/4] kvmppc: read device tree hypervisor node infrastructure
[PATCH 2/4] kvmppc: add hypercall infrastructure - guest part
[PATCH 3/4] kvmppc: magic page paravirtualization - guest part
[PATCH 4/4] kvmppc: convert wrteei to wrtee as kvm guest optimization

---
[diffstat]
 arch/powerpc/kernel/kvm.c            |   51 ++++++++++++++++++++++++++++++
 b/arch/powerpc/kernel/Makefile       |    2 +
 b/arch/powerpc/kernel/kvm.c          |   30 +++++++++++++++++
 b/arch/powerpc/kernel/setup_32.c     |    3 +
 b/arch/powerpc/platforms/44x/Kconfig |    7 ++++
 b/include/asm-powerpc/fixmap.h       |   10 +++++
 b/include/asm-powerpc/hw_irq.h       |   12 +++++++
 b/include/asm-powerpc/kvm_para.h     |   43 +++++++++++++++++++++++--
 b/mm/page_alloc.c                    |    1
 include/asm-powerpc/kvm_para.h       |   59 +++++++++++++++++++++++++++++++++++
 10 files changed, 214 insertions(+), 4 deletions(-)