From f7d376afdbf27a679ddeb78fd89a8c6cf653fb5d Mon Sep 17 00:00:00 2001 From: Roger Pau Monne Date: Thu, 19 Jun 2014 13:06:04 +0200 Subject: [PATCH v5 02/29] xen: mask all event channels on init Mask all event channels, this is done so that we don't receive spurious interrupts while dinamically registering new event channels, because there's a small window during registration where an event channel can fire before we have attached a handler to it. Approved by: xxx Sponsored by: Citrix Systems R&D x86/xen/xen_intr.c: - Mask all event channels on init. --- sys/x86/xen/xen_intr.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/sys/x86/xen/xen_intr.c b/sys/x86/xen/xen_intr.c index bf94168..d148798 100644 --- a/sys/x86/xen/xen_intr.c +++ b/sys/x86/xen/xen_intr.c @@ -584,6 +584,7 @@ xen_intr_handle_upcall(struct trapframe *trap_frame) 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)); -- 1.7.7.5 (Apple Git-26)