s390x/css: handle emw correctly for tsch

We should not try to store the emw portion of the irb if extended
measurements are not applicable. In particular, we should not surprise
the guest by storing a larger irb if it did not enable extended
measurements.

Cc: qemu-stable@nongnu.org
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390x/kvm: make flic play well with old kernels

If we run with an old kernel that does not support KVM_CAP_IRQ_ROUTING,
we don't have to do anything in the ->register_io_adapter and
->io_adapter_map callbacks and therefore should return 0 instead of
-ENOSYS (just as the non-kvm flic does).

This fixes using adapter interrupts when running under an older kernel,
which broke with "s390x: add I/O adapter registration".

Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390x/kvm: enable/reset cmma via vm attributes

Exploit the new api for userspace-controlled cmma. If supported, enable
cmma during kvm initialization and register a reset handler for cmma,
which is also called directly from the load IPL code.

The reset functionality is needed to reset the cmma state of the guest
pages, e.g. if a system reset is triggered via qemu monitor; otherwise
this could result in data corruption.

A guest triggered reboot may now lead to multiple cmma resets; this is
OK, however, as this is slowpath anyway and the simplest way to achieve
the intended effects.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390x/kvm: Log unmanageable external interruptions

Interception code 0x14 only drops to userspace when an unmanageable
external interruption interception occured (e.g. if the External New
PSW does not disable external interruptions). Instead of bailing out
via the default handler, it is better to inform the user with a
proper error message that also includes the bad PSW, and to stop
the affected CPU with a panic event instead.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390x/kvm: Log unmanageable program interruptions

The kernel only drops to userspace if an endless program interrupt loop
has been detected. Let's print an error message in this case to inform
the user about the crash and stop the affected CPU with a panic event,
just like it is already done for the external interruption loop detection.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390/virtio-ccw: migration support

This patch adds live migration support for virtio-ccw devices.
It's not done with vmstate because virtio itself is not yet ported
to vmstate either.

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390x: consolidate floating interrupts

Move the injection code for all floating interrupts to interrupt.c
and add a comment.

Also get rid of the #ifdef CONFIG_KVM for the service interrupt.

Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390x/kvm: add alternative injection interface

Add kvm_s390_{vcpu,floating}_interrupt, which offer the possibility
to inject interrupts with larger payloads (when a kvm backend becomes
available).

Moreover, kvm_s390_floating_interrupt() does no longer have the bogus
requirement for a vcpu.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390x: cleanup interrupt injection

Remove the need for a cpu to inject a floating interrupt on kvm.

Acked-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390x/kvm: inject via flic

Try to inject floating interrupts via the flic if it is available.
This allows us to inject the full range of floating interrupts.

Reviewed-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20140610' into staging

Several patches for s390:

- bugfixes: A fix for a long-standing bug in the css code as well as
  a fixup for the recent I/O adapter support.
- Exploitation of the userspace cmma enablement/reset interface, if
  it is present.
- Some debuggability improvements by logging unmanageable conditions.
- virtio-ccw finally gets migration support for its structures.
- Some cleanup as to how floating interrupts are injected.

# gpg: Signature made Tue 10 Jun 2014 08:57:56 BST using RSA key ID C6F02FAF
# gpg: Can't check signature: public key not found

* remotes/cohuck/tags/s390x-20140610:
  s390x/kvm: inject via flic
  s390x: cleanup interrupt injection
  s390x/kvm: add alternative injection interface
  s390x: consolidate floating interrupts
  s390/virtio-ccw: migration support
  s390x/kvm: Log unmanageable program interruptions
  s390x/kvm: Log unmanageable external interruptions
  s390x/kvm: enable/reset cmma via vm attributes
  s390x/kvm: make flic play well with old kernels
  s390x/css: handle emw correctly for tsch

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
console: kill MAX_CONSOLES, alloc consoles dynamically

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
console: fix -vga none -sdl crash

Call get_alloc_displaystate() for proper initialization
instead of allocating with g_new().

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Merge remote-tracking branch 'remotes/kraxel/tags/pull-console-20140610-1' into staging

console: two little bugfixes.

# gpg: Signature made Tue 10 Jun 2014 12:01:07 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-console-20140610-1:
  console: fix -vga none -sdl crash
  console: kill MAX_CONSOLES, alloc consoles dynamically

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>