Merge tag 'for-linus-7.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen updates from Juergen Gross:

 - fix running as Xen PVH guest in 32-bit mode without PAE

 - fix PV device handling for suspend/resume when running as
   a Xen guest

 - clean up workqueue usage

 - fix the Xen balloon driver for PVH dom0

 - introduce the possibility to use hypercalls for console
   messages in unprivileged guests

 - enable Xen dom0 use of virtio devices in nested virtualization
   setups

 - simplify the xen-mcelog driver

* tag 'for-linus-7.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xenbus: Rename helpers to freeze/thaw/restore
  xenbus: Use .freeze/.thaw to handle xenbus devices
  xen/mcelog: simplify MCE_GETCLEAR_FLAGS using xchg()
  xen/balloon: improve accuracy of initial balloon target for dom0
  Partial revert "x86/xen: fix balloon target initialization for PVH dom0"
  xen: introduce xen_console_io option
  xen/virtio: Don't use grant-dma-ops when running as Dom0
  x86/xen/pvh: Enable PAE mode for 32-bit guest only when CONFIG_X86_PAE is set
  xen: privcmd: WQ_PERCPU added to alloc_workqueue users
  xen/events: replace use of system_wq with system_percpu_wq

Documentation/admin-guide/kernel-parameters.txt

@@ -8437,6 +8437,11 @@ Kernel parameters
 			save/restore/migration must be enabled to handle larger
 			domains.
 
+	xen_console_io	[XEN,EARLY]
+			Boolean option to enable/disable the usage of the Xen
+			console_io hypercalls to read and write to the console.
+			Mostly useful for debugging and development.
+
 	xen_emul_unplug=		[HW,X86,XEN,EARLY]
 			Unplug Xen emulated devices
 			Format: [unplug0,][unplug1]