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authorJulien Grall <julien.grall@citrix.com>2015-07-28 12:10:42 +0300
committerDavid Vrabel <david.vrabel@citrix.com>2015-08-20 14:24:15 +0300
commit4a5b69464e51f4a8dd432e8c2a1468630df1a53c (patch)
tree31e4fcf70dc4488f3e5860e3825cb9fe7694adbd /arch/arm64
parent907c3eb18e0bd86ca12a9de80befe8e3647bac3e (diff)
downloadlinux-4a5b69464e51f4a8dd432e8c2a1468630df1a53c.tar.xz
xen/events: Support event channel rebind on ARM
Currently, the event channel rebind code is gated with the presence of the vector callback. The virtual interrupt controller on ARM has the concept of per-CPU interrupt (PPI) which allow us to support per-VCPU event channel. Therefore there is no need of vector callback for ARM. Xen is already using a free PPI to notify the guest VCPU of an event. Furthermore, the xen code initialization in Linux (see arch/arm/xen/enlighten.c) is requesting correctly a per-CPU IRQ. Introduce new helper xen_support_evtchn_rebind to allow architecture decide whether rebind an event is support or not. It will always return true on ARM and keep the same behavior on x86. This is also allow us to drop the usage of xen_have_vector_callback entirely in the ARM code. Signed-off-by: Julien Grall <julien.grall@citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/include/asm/xen/events.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/xen/events.h b/arch/arm64/include/asm/xen/events.h
index 86553213c132..4318866d053c 100644
--- a/arch/arm64/include/asm/xen/events.h
+++ b/arch/arm64/include/asm/xen/events.h
@@ -18,4 +18,10 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
#define xchg_xen_ulong(ptr, val) xchg((ptr), (val))
+/* Rebind event channel is supported by default */
+static inline bool xen_support_evtchn_rebind(void)
+{
+ return true;
+}
+
#endif /* _ASM_ARM64_XEN_EVENTS_H */