[Xen-devel] [PATCH v6 19/22] hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

This new delivery type which is for ARM shares the same value with
HVM_PARAM_CALLBACK_TYPE_VECTOR which is for x86.

val[15:8] is flag: val[7:0] is a PPI.
To the flag, bit 8 stands the interrupt mode is edge(1) or level(0) and
bit 9 stands the interrupt polarity is active low(1) or high(0).

Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
v6: share the value with HVM_PARAM_CALLBACK_TYPE_VECTOR
---
 xen/include/public/hvm/params.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 73d4718..50f5a2f 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -49,11 +49,24 @@
  * Domain = val[47:32], Bus = val[31:16] DevFn = val[15:8], IntX = val[1:0]
  */
 
+#ifndef CONFIG_ARM
 #define HVM_PARAM_CALLBACK_TYPE_VECTOR   2
 /*
  * val[7:0] is a vector number.  Check for XENFEAT_hvm_callback_vector to know
  * if this delivery method is available.
  */
+#else
+#define HVM_PARAM_CALLBACK_TYPE_PPI      2
+/*
+ * val[55:16] needs to be zero.
+ * val[15:8] is interrupt flag of the PPI used by event-channel:
+ *  bit 8: the PPI is edge(1) or level(0) triggered
+ *  bit 9: the PPI is active low(1) or high(0)
+ * val[7:0] is a PPI number used by event-channel.
+ * This is only used by ARM/ARM64 and masking/eoi the interrupt associated to
+ * the notification is handled by the interrupt controller.
+ */
+#endif
 
 /*
  * These are not used by Xen. They are here for convenience of HVM-guest
-- 
2.0.4



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