From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Tue, 22 Apr 2014 13:51:06 +0000 (-0300)
Subject: Merge tag 'kvm-s390-20140422' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms39... 
X-Git-Tag: next-20140428~25^2~13
X-Git-Url: https://git.kernelconcepts.de/?a=commitdiff_plain;h=63b5cf04f4ede6046cc8771789e5ac40529f30e8;p=karo-tx-linux.git

Merge tag 'kvm-s390-20140422' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into queue

Lazy storage key handling
-------------------------
Linux does not use the ACC and F bits of the storage key. Newer Linux
versions also do not use the storage keys for dirty and reference
tracking. We can optimize the guest handling for those guests for faults
as well as page-in and page-out by simply not caring about the guest
visible storage key. We trap guest storage key instruction to enable
those keys only on demand.

Migration bitmap

Until now s390 never provided a proper dirty bitmap.  Let's provide a
proper migration bitmap for s390. We also change the user dirty tracking
to a fault based mechanism. This makes the host completely independent
from the storage keys. Long term this will allow us to back guest memory
with large pages.

per-VM device attributes
------------------------
To avoid the introduction of new ioctls, let's provide the
attribute semanantic also on the VM-"device".

Userspace controlled CMMA
-------------------------
The CMMA assist is changed from "always on" to "on if requested" via
per-VM device attributes. In addition a callback to reset all usage
states is provided.

Proper guest DAT handling for intercepts
----------------------------------------
While instructions handled by SIE take care of all addressing aspects,
KVM/s390 currently does not care about guest address translation of
intercepts. This worked out fine, because
- the s390 Linux kernel has a 1:1 mapping between kernel virtual<->real
 for all pages up to memory size
- intercepts happen only for a small amount of cases
- all of these intercepts happen to be in the kernel text for current
  distros

Of course we need to be better for other intercepts, kernel modules etc.
We provide the infrastructure and rework all in-kernel intercepts to work
on logical addresses (paging etc) instead of real ones. The code has
been running internally for several months now, so it is time for going
public.

GDB support
-----------
We provide breakpoints, single stepping and watchpoints.

Fixes/Cleanups
--------------
- Improve program check delivery
- Factor out the handling of transactional memory  on program checks
- Use the existing define __LC_PGM_TDB
- Several cleanups in the lowcore structure
- Documentation

NOTES
-----
- All patches touching base s390 are either ACKed or written by the s390
  maintainers
- One base KVM patch "KVM: add kvm_is_error_gpa() helper"
- One patch introduces the notion of VM device attributes

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Conflicts:
	include/uapi/linux/kvm.h
---

63b5cf04f4ede6046cc8771789e5ac40529f30e8
diff --cc include/uapi/linux/kvm.h
index d8a6ce4c2a83,90acfe4966e7..836e15b7abc8
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@@ -744,7 -743,7 +744,8 @@@ struct kvm_ppc_smmu_info 
  #define KVM_CAP_IOAPIC_POLARITY_IGNORED 97
  #define KVM_CAP_ENABLE_CAP_VM 98
  #define KVM_CAP_S390_IRQCHIP 99
 -#define KVM_CAP_VM_ATTRIBUTES 100
 +#define KVM_CAP_IOEVENTFD_NO_LENGTH 100
++#define KVM_CAP_VM_ATTRIBUTES 101
  
  #ifdef KVM_CAP_IRQ_ROUTING