linux-kernel - Re: [Xen-devel] [PATCH v2 08/16] xen/hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK

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Message-ID: <569F2A4D.9070006@huawei.com>
Date:	Wed, 20 Jan 2016 14:33:49 +0800
From:	Shannon Zhao <zhaoshenglong@...wei.com>
To:	Andrew Cooper <andrew.cooper3@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<ard.biesheuvel@...aro.org>, <stefano.stabellini@...rix.com>,
	<david.vrabel@...rix.com>, <mark.rutland@....com>,
	<devicetree@...r.kernel.org>, <linux-efi@...r.kernel.org>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xen.org>,
	<julien.grall@...rix.com>, <shannon.zhao@...aro.org>,
	<peter.huangpeng@...wei.com>
Subject: Re: [Xen-devel] [PATCH v2 08/16] xen/hvm/params: Add a new delivery
 type for event-channel in HVM_PARAM_CALLBACK_IRQ



On 2016/1/18 20:52, Andrew Cooper wrote:
> On 18/01/16 12:46, Stefano Stabellini wrote:
>> > On Mon, 18 Jan 2016, Andrew Cooper wrote:
>>> >> On 18/01/16 12:38, Stefano Stabellini wrote:
>>>> >>> On Fri, 15 Jan 2016, Shannon Zhao wrote:
>>>>> >>>> From: Shannon Zhao <shannon.zhao@...aro.org>
>>>>> >>>>
>>>>> >>>> Add a new delivery type:
>>>>> >>>> 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@...aro.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
>>>> >>> Andrew, I think that this patch is correct. Looking back at your
>>>> >>> previous comment (http://marc.info/?l=devicetree&m=144804014214262&w=2),
>>>> >>> is it possible that you were confused by enum callback_via_type, which
>>>> >>> is internal to Xen and offset'ed by 1 compared to the described values
>>>> >>> in xen/include/public/hvm/params.h?
>>>> >>>
>>>> >>> If not, and indeed somebody introduced one more field but failed to
>>>> >>> document it, then I suggest she sends a patch to fix the issue as soon
>>>> >>> as possible.
>>> >> I was indeed confused - the ABI is utterly mad.
>> > All right. In that case, Shannon, you can add my
>> >
>> > Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
>> >
>> >
>>> >> However, this change does need rebasing over c/s ca5c54b, which was the
>>> >> result of the original discussion.
>> > c/s ca5c54b is for Xen, while this is a Linux patch (Linux has its own
>> > set of Xen headers).
> All ABI changes need to happen in the Xen public headers first.  This
> patch cannot be accepted yet.
So you mean it should port c/s ca5c54b to Linux first? Then add this
change based on that?

Thanks,
-- 
Shannon