Re: [Xen-devel] [PATCH 11/13] xen/hvm/params: Add a new dilivery type for event-channel in HVM_PARAM_CALLBACK_IRQ

On Fri, 20 Nov 2015, Andrew Cooper wrote:

On 20/11/15 17:07, Stefano Stabellini wrote:

quoted

On Tue, 17 Nov 2015, shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org wrote:

quoted

From: Shannon Zhao <redacted>

Add a new dilivery type:

delivery

quoted

val[63:56] == 3: val[15:8] is flag: val[7:0] is a PPI.
To the flag, bit 0 stands the interrupt mode is edge(1) or level(0) and
bit 1 stands the interrupt polarity is active low(1) or high(0).

Signed-off-by: Shannon Zhao <redacted>
---
 include/xen/interface/hvm/params.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/xen/interface/hvm/params.h b/include/xen/interface/hvm/params.h
index a6c7991..550688a 100644
--- a/include/xen/interface/hvm/params.h
+++ b/include/xen/interface/hvm/params.h

@@ -34,6 +34,11 @@
  *                  Domain = val[47:32], Bus  = val[31:16],
  *                  DevFn  = val[15: 8], IntX = val[ 1: 0]
  * val[63:56] == 2: val[7:0] is a vector number.
+ * val[63:56] == 3: val[15:8] is flag of event-channel interrupt:
+ *                      bit 0: interrupt is edge(1) or level(0) triggered
+ *                      bit 1: interrupt is active low(1) or high(0)
+ *                  val[7:0] is PPI number used by event-channel.
+ *                  This is only used by ARM/ARM64.
  * If val == 0 then CPU0 event-channel notifications are not delivered.
  */
 #define HVM_PARAM_CALLBACK_IRQ 0

Sadly NACK in this form.

This is not your fault, but this particular field has hidden ABI which
the original submitter neglected to put into public API.

Bits 63:56 of this field currently have a hidden ABI with:

xen/include/asm-x86/hvm/irq.h
enum {
    HVMIRQ_callback_none,
    HVMIRQ_callback_gsi,
    HVMIRQ_callback_pci_intx,
    HVMIRQ_callback_vector
} callback_via_type;

 
I take the value should be "4" then?

I will submit a patch to fix this this properly.