xen/events: fix unmask_evtchn for PV on HVM guests

When unmask_evtchn is called, if we already have an event pending, we
just set evtchn_pending_sel waiting for local_irq_enable to be called.
That is because PV guests set the irq_enable pvops to
xen_irq_enable_direct in xen_setup_vcpu_info_placement:
xen_irq_enable_direct is implemented in assembly in
arch/x86/xen/xen-asm.S and call xen_force_evtchn_callback if
XEN_vcpu_info_pending is set.

However HVM guests (and ARM guests) do not change or do not have the
irq_enable pvop, so evtchn_unmask cannot work properly for them.

Considering that having the pending_irq bit set when unmask_evtchn is
called is not very common, and it is simpler to keep the
native_irq_enable implementation for HVM guests (and ARM guests), the
best thing to do is just use the EVTCHNOP_unmask hypercall (Xen
re-injects pending events in response).

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 7595581d032c..36bf17dc7bfc 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -373,11 +373,22 @@ static void unmask_evtchn(int port)
 {
         struct shared_info *s = HYPERVISOR_shared_info;
         unsigned int cpu = get_cpu();
+        int do_hypercall = 0, evtchn_pending = 0;
 
         BUG_ON(!irqs_disabled());
 
-        /* Slow path (hypercall) if this is a non-local port. */
-        if (unlikely(cpu != cpu_from_evtchn(port))) {
+        if (unlikely((cpu != cpu_from_evtchn(port))))
+                do_hypercall = 1;
+        else
+                evtchn_pending = sync_test_bit(port, &s->evtchn_pending[0]);
+
+        if (unlikely(evtchn_pending && xen_hvm_domain()))
+                do_hypercall = 1;
+
+        /* Slow path (hypercall) if this is a non-local port or if this is
+         * an hvm domain and an event is pending (hvm domains don't have
+         * their own implementation of irq_enable). */
+        if (do_hypercall) {
                 struct evtchn_unmask unmask = { .port = port };
                 (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
         } else {
@@ -390,7 +401,7 @@ static void unmask_evtchn(int port)
                  * 'hw_resend_irq'. Just like a real IO-APIC we 'lose
                  * the interrupt edge' if the channel is masked.
                  */
-                if (sync_test_bit(port, &s->evtchn_pending[0]) &&
+                if (evtchn_pending &&
                     !sync_test_and_set_bit(port / BITS_PER_LONG,
                                            &vcpu_info->evtchn_pending_sel))
                         vcpu_info->evtchn_upcall_pending = 1;