Re: [PATCH v7 09/11] iommu/vt-d: Add bind guest PASID support

Lu Baolu
2019-10-29T05:07:21Z

Hi,

On 10/29/19 12:11 PM, Jacob Pan wrote:
> On Tue, 29 Oct 2019 10:54:48 +0800
> Lu Baolu<baolu.lu@linux.intel.com> wrote:
>
>> Hi,
>>
>> On 10/29/19 6:29 AM, Jacob Pan wrote:
>>> Hi Baolu,
>>>
>>> Appreciate the thorough review, comments inline.
>> You are welcome.
>>
>>> On Sat, 26 Oct 2019 10:01:19 +0800
>>> Lu Baolu<baolu.lu@linux.intel.com> wrote:
>>>
>>>> Hi,
>>>>
>> [...]
>>
>>>>> + * allow multiple bind calls with the
>>>>> same PASID and pdev.
>>>>> + */
>>>>> + sdev->users++;
>>>>> + goto out;
>>>>> + }
>>>> I remember I ever pointed this out before. But I forgot how we
>>>> addressed it. So forgive me if this has been addressed.
>>>>
>>>> What if we have a valid bound svm but @dev doesn't belong to it
>>>> (a.k.a. @dev not in svm->devs list)?
>>>>
>>> If we are binding a new device to an existing/active PASID, the code
>>> will allocate a new sdev and add that to the svm->devs list.
>> But allocating a new sdev and adding device is in below else branch,
>> so it will never reach there, right?
>>
> No, allocating sdev is outside else branch.

Oh, yes! Please ignore it.

Best regards,
baolu