From: Nicolin Chen <nicolinc@nvidia.com>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: "jgg@nvidia.com" <jgg@nvidia.com>,
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Subject: Re: [PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC
Date: Tue, 18 Feb 2025 09:53:13 -0800 [thread overview]
Message-ID: <Z7TJCcH9iFvcEDuO@nvidia.com> (raw)
In-Reply-To: <BN9PR11MB527614EB9CBA3BAB951B0DDD8CFA2@BN9PR11MB5276.namprd11.prod.outlook.com>
On Tue, Feb 18, 2025 at 05:13:47AM +0000, Tian, Kevin wrote:
> > From: Nicolin Chen <nicolinc@nvidia.com>
> > Sent: Saturday, January 25, 2025 8:31 AM
> > +
> > +/*
> > + * An iommufd_veventq object represents an interface to deliver vIOMMU
> > events to
> > + * the user space. It is created/destroyed by the user space and associated
> > with
> > + * vIOMMU object(s) during the allocations.
>
> s/object(s)/object/, given the eventq cannot be shared between vIOMMUs.
Done. Adding an "a" too.
> > +static inline void iommufd_vevent_handler(struct iommufd_veventq
> > *veventq,
> > + struct iommufd_vevent *vevent)
> > +{
> > + struct iommufd_eventq *eventq = &veventq->common;
> > +
> > + /*
> > + * Remove the overflow node and add the new node at the same
> > time. Note
> > + * it is possible that vevent == &veventq->overflow for sequence
> > update
> > + */
> > + spin_lock(&eventq->lock);
> > + if (veventq->overflow.on_list) {
> > + list_del(&veventq->overflow.node);
> > + veventq->overflow.on_list = false;
> > + }
>
> We can save one field 'on_list' in every entry by:
>
> if (list_is_last(&veventq->overflow.node, &eventq->deliver))
> list_del(&veventq->overflow.node);
Hmm. Given that the overflow node, if being on the list, should be
always the last one... yes!
> > +struct iommufd_vevent_header {
> > + __aligned_u64 flags;
> > + __u32 sequence;
> > + __u32 __reserved;
> > +};
>
> Is there a reason that flags must be u64? At a glance all flags fields
> (except the one in iommu_hwpt_vtd_s1) in iommufd uAPIs are u32
> which can cut the size of the header by half...
Not having a particular reason yet. Just thought that a 64-bit
could make the uAPI more expandable. It's true that u32 would
be cleaner. I will make a change.
>
> > +void iommufd_veventq_abort(struct iommufd_object *obj)
> > +{
> > + struct iommufd_eventq *eventq =
> > + container_of(obj, struct iommufd_eventq, obj);
> > + struct iommufd_veventq *veventq = eventq_to_veventq(eventq);
> > + struct iommufd_viommu *viommu = veventq->viommu;
> > + struct iommufd_vevent *cur, *next;
> > +
> > + lockdep_assert_held_write(&viommu->veventqs_rwsem);
> > +
> > + list_for_each_entry_safe(cur, next, &eventq->deliver, node) {
> > + list_del(&cur->node);
> > + kfree(cur);
>
> kfree() doesn't apply to the overflow node.
Oh right, that's missed.
> otherwise it looks good to me:
>
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Thanks!
Nicolin
next prev parent reply other threads:[~2025-02-18 17:53 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-25 0:30 [PATCH v6 00/14] iommufd: Add vIOMMU infrastructure (Part-3: vEVENTQ) Nicolin Chen
2025-01-25 0:30 ` [PATCH v6 01/14] iommufd/fault: Move two fault functions out of the header Nicolin Chen
2025-02-14 20:15 ` Jason Gunthorpe
2025-02-18 5:05 ` Tian, Kevin
2025-01-25 0:30 ` [PATCH v6 02/14] iommufd/fault: Add an iommufd_fault_init() helper Nicolin Chen
2025-01-25 0:30 ` [PATCH v6 03/14] iommufd: Abstract an iommufd_eventq from iommufd_fault Nicolin Chen
2025-02-14 20:23 ` Jason Gunthorpe
2025-01-25 0:30 ` [PATCH v6 04/14] iommufd: Rename fault.c to eventq.c Nicolin Chen
2025-01-25 0:30 ` [PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC Nicolin Chen
2025-02-18 5:13 ` Tian, Kevin
2025-02-18 17:53 ` Nicolin Chen [this message]
2025-02-18 15:29 ` Jason Gunthorpe
2025-02-18 17:47 ` Nicolin Chen
2025-02-18 18:08 ` Jason Gunthorpe
2025-02-18 18:15 ` Nicolin Chen
2025-01-25 0:30 ` [PATCH v6 06/14] iommufd/viommu: Add iommufd_viommu_get_vdev_id helper Nicolin Chen
2025-02-18 15:31 ` Jason Gunthorpe
2025-02-20 5:17 ` Nicolin Chen
2025-02-20 16:19 ` Jason Gunthorpe
2025-01-25 0:30 ` [PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper Nicolin Chen
2025-02-18 5:14 ` Tian, Kevin
2025-02-18 15:35 ` Jason Gunthorpe
2025-02-19 6:58 ` Tian, Kevin
2025-02-20 21:16 ` Nicolin Chen
2025-02-21 4:27 ` Tian, Kevin
2025-02-21 13:39 ` Jason Gunthorpe
2025-01-25 0:30 ` [PATCH v6 08/14] iommufd/selftest: Require vdev_id when attaching to a nested domain Nicolin Chen
2025-02-18 5:15 ` Tian, Kevin
2025-01-25 0:30 ` [PATCH v6 09/14] iommufd/selftest: Add IOMMU_TEST_OP_TRIGGER_VEVENT for vEVENTQ coverage Nicolin Chen
2025-02-18 5:16 ` Tian, Kevin
2025-01-25 0:30 ` [PATCH v6 10/14] iommufd/selftest: Add IOMMU_VEVENTQ_ALLOC test coverage Nicolin Chen
2025-02-18 5:19 ` Tian, Kevin
2025-01-25 0:30 ` [PATCH v6 11/14] Documentation: userspace-api: iommufd: Update FAULT and VEVENTQ Nicolin Chen
2025-01-28 8:21 ` Bagas Sanjaya
2025-02-18 17:02 ` Jason Gunthorpe
2025-01-25 0:30 ` [PATCH v6 12/14] iommu/arm-smmu-v3: Introduce struct arm_smmu_vmaster Nicolin Chen
2025-02-18 17:08 ` Jason Gunthorpe
2025-02-20 7:16 ` Nicolin Chen
2025-01-25 0:30 ` [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU Nicolin Chen
2025-02-18 5:21 ` Tian, Kevin
2025-02-18 17:18 ` Jason Gunthorpe
2025-02-18 18:28 ` Nicolin Chen
2025-02-18 18:50 ` Jason Gunthorpe
2025-02-18 19:02 ` Nicolin Chen
2025-02-18 19:08 ` Jason Gunthorpe
2025-02-18 19:27 ` Nicolin Chen
2025-02-20 20:45 ` Nicolin Chen
2025-02-20 23:24 ` Jason Gunthorpe
2025-02-21 8:10 ` Nicolin Chen
2025-01-25 0:30 ` [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations Nicolin Chen
2025-02-18 5:24 ` Tian, Kevin
2025-02-18 18:17 ` Pranjal Shrivastava
2025-02-18 18:52 ` Jason Gunthorpe
2025-02-20 7:12 ` Nicolin Chen
2025-02-18 18:53 ` Nicolin Chen
2025-02-20 16:15 ` Pranjal Shrivastava
2025-02-18 17:21 ` Jason Gunthorpe
2025-02-18 18:14 ` Nicolin Chen
2025-02-20 9:09 ` Nicolin Chen
2025-02-14 8:03 ` [PATCH v6 00/14] iommufd: Add vIOMMU infrastructure (Part-3: vEVENTQ) Nicolin Chen
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