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

[Andrew Cooper <andrew.cooper3-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>]

On 20/11/15 17:07, Stefano Stabellini wrote:
> On Tue, 17 Nov 2015, shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org wrote:
>> From: Shannon Zhao <shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>>
>> Add a new dilivery type:
> delivery
>
>> 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 <shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>> ---
>>  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 will submit a patch to fix this this properly.

~Andrew
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