KarimAllah Ahmed 72a9b18629 xen: Remove event channel notification through Xen PCI platform device ... Ever since commit 254d1a3f02 ("xen/pv-on-hvm kexec: shutdown watches from old kernel") using the INTx interrupt from Xen PCI platform device for event channel notification would just lockup the guest during bootup. postcore_initcall now calls xs_reset_watches which will eventually try to read a value from XenStore and will get stuck on read_reply at XenBus forever since the platform driver is not probed yet and its INTx interrupt handler is not registered yet. That means that the guest can not be notified at this moment of any pending event channels and none of the per-event handlers will ever be invoked (including the XenStore one) and the reply will never be picked up by the kernel. The exact stack where things get stuck during xenbus_init: -xenbus_init -xs_init -xs_reset_watches -xenbus_scanf -xenbus_read -xs_single -xs_single -xs_talkv Vector callbacks have always been the favourite event notification mechanism since their introduction in commit 38e20b07ef ("x86/xen: event channels delivery on HVM.") and the vector callback feature has always been advertised for quite some time by Xen that's why INTx was broken for several years now without impacting anyone. Luckily this also means that event channel notification through INTx is basically dead-code which can be safely removed without impacting anybody since it has been effectively disabled for more than 4 years with nobody complaining about it (at least as far as I'm aware of). This commit removes event channel notification through Xen PCI platform device. Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Juergen Gross <jgross@suse.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: x86@kernel.org Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: Julien Grall <julien.grall@citrix.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Ross Lagerwall <ross.lagerwall@citrix.com> Cc: xen-devel@lists.xenproject.org Cc: linux-kernel@vger.kernel.org Cc: linux-pci@vger.kernel.org Cc: Anthony Liguori <aliguori@amazon.com> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>		2016-09-30 11:44:34 +01:00
..
interface	xen: update xen headers	2016-07-06 10:42:13 +01:00
acpi.h	xen / ACPI: notify xen when reduced hardware sleep is available	2013-07-31 14:22:35 +02:00
balloon.h	xen/balloon: use hotplugged pages for foreign mappings etc.	2015-10-23 14:20:05 +01:00
events.h	xen/events: Support event channel rebind on ARM	2015-08-20 12:24:15 +01:00
features.h
grant_table.h	xen/grant-table: Add an helper to iterate over a specific number of grants	2015-10-23 14:20:46 +01:00
hvc-console.h	treewide: use __printf not __attribute__((format(printf,...)))	2011-10-31 17:30:54 -07:00
hvm.h	xen: Convert printks to pr_<level>	2013-06-28 11:19:58 -04:00
page.h	xen: Fix page <-> pfn conversion on 32 bit systems	2016-04-06 11:18:17 +01:00
platform_pci.h	xen/pvhvm: Remove the xen_platform_pci int.	2014-01-03 14:54:53 -05:00
swiotlb-xen.h	dma-mapping: use unsigned long for dma_attrs	2016-08-04 08:50:07 -04:00
tmem.h	xen: tmem: enable Xen tmem shim to be built/loaded as a module	2013-04-30 17:04:01 -07:00
xen-ops.h	xen: add static initialization of steal_clock op to xen_time_ops	2016-07-26 14:07:06 +01:00
xen.h	xen: Remove event channel notification through Xen PCI platform device	2016-09-30 11:44:34 +01:00
xenbus_dev.h	xenbus: Add support for xenbus backend in stub domain	2012-05-21 09:53:18 -04:00
xenbus.h	xen/xenbus: Rename *RING_PAGE* to *RING_GRANT*	2015-10-23 14:20:46 +01:00