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David Vrabel 8d3cbb9096 xen/events: don't bind non-percpu VIRQs with percpu chip 
commit 77bb3dfdc0 upstream.

A non-percpu VIRQ (e.g., VIRQ_CONSOLE) may be freed on a different
VCPU than it is bound to.  This can result in a race between
handle_percpu_irq() and removing the action in __free_irq() because
handle_percpu_irq() does not take desc->lock.  The interrupt handler
sees a NULL action and oopses.

Only use the percpu chip/handler for per-CPU VIRQs (like VIRQ_TIMER).

  # cat /proc/interrupts | grep virq
   40:      87246          0  xen-percpu-virq      timer0
   44:          0          0  xen-percpu-virq      debug0
   47:          0      20995  xen-percpu-virq      timer1
   51:          0          0  xen-percpu-virq      debug1
   69:          0          0   xen-dyn-virq      xen-pcpu
   74:          0          0   xen-dyn-virq      mce
   75:         29          0   xen-dyn-virq      hvc_console

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2015-06-06 08:19:32 -07:00
..
interface Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2014-02-14 10:45:18 -08:00
acpi.h xen / ACPI: notify xen when reduced hardware sleep is available 2013-07-31 14:22:35 +02:00
balloon.h xen/balloon: set a mapping for ballooned out pages 2013-08-09 11:23:24 -04:00
events.h xen/events: don't bind non-percpu VIRQs with percpu chip 2015-06-06 08:19:32 -07:00
features.h
…
grant_table.h Revert "xen/grant-table: Avoid m2p_override during mapping" 2014-02-03 06:44:49 -05:00
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: allow balloon driver to use more than one memory region 2011-09-29 11:12:10 -04:00
platform_pci.h xen/pvhvm: Remove the xen_platform_pci int. 2014-01-03 14:54:53 -05:00
swiotlb-xen.h Merge remote-tracking branch 'stefano/swiotlb-xen-9.1' into stable/for-linus-3.13 2013-11-08 16:10:48 -05:00
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 swiotlb-xen: use xen_alloc/free_coherent_pages 2013-10-10 13:41:10 +00:00
xen.h xen/pvh/x86: Define what an PVH guest is (v3). 2014-01-06 10:43:58 -05:00
xenbus.h xenbus: delay xenbus frontend resume if xenstored is not running 2013-05-29 09:04:19 -04:00
xenbus_dev.h xenbus: Add support for xenbus backend in stub domain 2012-05-21 09:53:18 -04:00