Author: royger
Date: Mon Aug 4 08:43:27 2014
New Revision: 269508
URL: http://svnweb.freebsd.org/changeset/base/269508
Log:
xen: mask all event channels on init
Mask all event channels during initialization. This is done so that we
don't receive spurious interrupts while dynamically registering new
event channels. There's a small window during registration where an
event channel can fire before we have attached a handler to it.
Sponsored by: Citrix Systems R&D
x86/xen/xen_intr.c:
- Mask all event channels on init.
Modified:
head/sys/x86/xen/xen_intr.c
Modified: head/sys/x86/xen/xen_intr.c
==============================================================================
--- head/sys/x86/xen/xen_intr.c Mon Aug 4 08:42:29 2014 (r269507)
+++ head/sys/x86/xen/xen_intr.c Mon Aug 4 08:43:27 2014 (r269508)
@@ -584,6 +584,7 @@ xen_intr_handle_upcall(struct trapframe
static int
xen_intr_init(void *dummy __unused)
{
+ shared_info_t *s = HYPERVISOR_shared_info;
struct xen_intr_pcpu_data *pcpu;
struct physdev_pirq_eoi_gmfn eoi_gmfn;
int i, rc;
@@ -607,6 +608,9 @@ xen_intr_init(void *dummy __unused)
xen_intr_intrcnt_add(i);
}
+ for (i = 0; i < nitems(s->evtchn_mask); i++)
+ atomic_store_rel_long(&s->evtchn_mask[i], ~0);
+
/* Try to register PIRQ EOI map */
xen_intr_pirq_eoi_map = malloc(PAGE_SIZE, M_XENINTR, M_WAITOK | M_ZERO);
eoi_gmfn.gmfn = atop(vtophys(xen_intr_pirq_eoi_map));
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