Merge remote-tracking branch 'mst/tags/for_anthony' into staging

pci, pc, pvpanic bug fixes

This fixes strange pvpanic behaviour: you had to
pause to let VM continue (and potentially reboot on panic
if enabled).

This also fixes two bugs reported by Andreas.
One is a long-standing bug exposed by recent pci changes,
the other affects old piix machine types and was caused
by recent acpi changes.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Mon 04 Nov 2013 05:42:46 AM PST using RSA key ID D28D5469
# gpg: Can't check signature: public key not found

# By Michael S. Tsirkin (2) and Paolo Bonzini (1)
# Via Michael S. Tsirkin
* mst/tags/for_anthony:
  vl: allow "cont" from panicked state
  exec: limit system memory size
  pc: disable acpi info for isapc and old pc machine

Message-id: 1383572851-28326-1-git-send-email-mst@redhat.com
Signed-off-by: Anthony Liguori <aliguori@amazon.com>