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David Vrabel 77bb3dfdc0 xen/events: don't bind non-percpu VIRQs with percpu chip

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>
Cc: <stable@vger.kernel.org>

2015-05-19 19:55:36 +01:00

interface

xen: synchronize include/xen/interface/xen.h with xen

2015-03-16 14:49:13 +00:00

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