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authorSheng Yang <sheng@linux.intel.com>2010-05-14 12:40:51 +0100
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-07-22 16:45:59 -0700
commit38e20b07efd541a959de367dc90a17f92ce2e8a6 (patch)
treebb087e243bf6e707dd063be2024a3b90de2f9413 /include/xen/events.h
parentbee6ab53e652a414af20392899879b58cd80d033 (diff)
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x86/xen: event channels delivery on HVM.
Set the callback to receive evtchns from Xen, using the callback vector delivery mechanism. The traditional way for receiving event channel notifications from Xen is via the interrupts from the platform PCI device. The callback vector is a newer alternative that allow us to receive notifications on any vcpu and doesn't need any PCI support: we allocate a vector exclusively to receive events, in the vector handler we don't need to interact with the vlapic, therefore we avoid a VMEXIT. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'include/xen/events.h')
-rw-r--r--include/xen/events.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/xen/events.h b/include/xen/events.h
index e68d59a90ca..a15d93262e3 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -56,4 +56,11 @@ void xen_poll_irq(int irq);
/* Determine the IRQ which is bound to an event channel */
unsigned irq_from_evtchn(unsigned int evtchn);
+/* Xen HVM evtchn vector callback */
+extern void xen_hvm_callback_vector(void);
+extern int xen_have_vector_callback;
+int xen_set_callback_via(uint64_t via);
+void xen_evtchn_do_upcall(struct pt_regs *regs);
+void xen_hvm_evtchn_do_upcall(void);
+
#endif /* _XEN_EVENTS_H */