From: Auger Eric <eric.auger@redhat.com>
To: Jacob Pan <jacob.pan.linux@gmail.com>,
iommu@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
Lu Baolu <baolu.lu@linux.intel.com>,
Joerg Roedel <joro@8bytes.org>,
David Woodhouse <dwmw2@infradead.org>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
Raj Ashok <ashok.raj@intel.com>, Wu Hao <hao.wu@intel.com>
Subject: Re: [PATCH v2 5/9] iommu/ioasid: Introduce ioasid_set private ID
Date: Tue, 1 Sep 2020 17:38:44 +0200 [thread overview]
Message-ID: <8fe449f7-606e-e90a-28d5-9c29cac5a9c3@redhat.com> (raw)
In-Reply-To: <1598070918-21321-6-git-send-email-jacob.jun.pan@linux.intel.com>
Hi Jacob,
On 8/22/20 6:35 AM, Jacob Pan wrote:
> When an IOASID set is used for guest SVA, each VM will acquire its
> ioasid_set for IOASID allocations. IOASIDs within the VM must have a
> host/physical IOASID backing, mapping between guest and host IOASIDs can
> be non-identical. IOASID set private ID (SPID) is introduced in this
> patch to be used as guest IOASID. However, the concept of ioasid_set
> specific namespace is generic, thus named SPID.
>
> As SPID namespace is within the IOASID set, the IOASID core can provide
> lookup services at both directions. SPIDs may not be allocated when its
> IOASID is allocated, the mapping between SPID and IOASID is usually
> established when a guest page table is bound to a host PASID.
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> ---
> drivers/iommu/ioasid.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/ioasid.h | 12 +++++++++++
> 2 files changed, 66 insertions(+)
>
> diff --git a/drivers/iommu/ioasid.c b/drivers/iommu/ioasid.c
> index 5f31d63c75b1..c0aef38a4fde 100644
> --- a/drivers/iommu/ioasid.c
> +++ b/drivers/iommu/ioasid.c
> @@ -21,6 +21,7 @@ enum ioasid_state {
> * struct ioasid_data - Meta data about ioasid
> *
> * @id: Unique ID
> + * @spid: Private ID unique within a set
> * @users Number of active users
> * @state Track state of the IOASID
> * @set Meta data of the set this IOASID belongs to
> @@ -29,6 +30,7 @@ enum ioasid_state {
> */
> struct ioasid_data {
> ioasid_t id;
> + ioasid_t spid;
> struct ioasid_set *set;
> refcount_t users;
> enum ioasid_state state;
> @@ -326,6 +328,58 @@ int ioasid_attach_data(ioasid_t ioasid, void *data)
> EXPORT_SYMBOL_GPL(ioasid_attach_data);
>
> /**
> + * ioasid_attach_spid - Attach ioasid_set private ID to an IOASID
> + *
> + * @ioasid: the ID to attach
> + * @spid: the ioasid_set private ID of @ioasid
> + *
> + * For IOASID that is already allocated, private ID within the set can be
> + * attached via this API. Future lookup can be done via ioasid_find.
I would remove "For IOASID that is already allocated, private ID within
the set can be attached via this API"
> + */
> +int ioasid_attach_spid(ioasid_t ioasid, ioasid_t spid)
> +{
> + struct ioasid_data *ioasid_data;
> + int ret = 0;
> +
> + spin_lock(&ioasid_allocator_lock);
We keep on saying the SPID is local to an IOASID set but we don't check
any IOASID set contains this ioasid. It looks a bit weird to me.
> + ioasid_data = xa_load(&active_allocator->xa, ioasid);
> +
> + if (!ioasid_data) {
> + pr_err("No IOASID entry %d to attach SPID %d\n",
> + ioasid, spid);
> + ret = -ENOENT;
> + goto done_unlock;
> + }
> + ioasid_data->spid = spid;
is there any way/need to remove an spid binding?
> +
> +done_unlock:
> + spin_unlock(&ioasid_allocator_lock);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(ioasid_attach_spid);
> +
> +ioasid_t ioasid_find_by_spid(struct ioasid_set *set, ioasid_t spid)
> +{
> + struct ioasid_data *entry;
> + unsigned long index;
> +
> + if (!xa_load(&ioasid_sets, set->sid)) {
> + pr_warn("Invalid set\n");
> + return INVALID_IOASID;
> + }
> +
> + xa_for_each(&set->xa, index, entry) {
> + if (spid == entry->spid) {
> + pr_debug("Found ioasid %lu by spid %u\n", index, spid);
> + refcount_inc(&entry->users);
> + return index;
> + }
> + }
> + return INVALID_IOASID;
> +}
> +EXPORT_SYMBOL_GPL(ioasid_find_by_spid);
> +
> +/**
> * ioasid_alloc - Allocate an IOASID
> * @set: the IOASID set
> * @min: the minimum ID (inclusive)
> diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
> index 310abe4187a3..d4b3e83672f6 100644
> --- a/include/linux/ioasid.h
> +++ b/include/linux/ioasid.h
> @@ -73,6 +73,8 @@ bool ioasid_is_active(ioasid_t ioasid);
>
> void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid, bool (*getter)(void *));
> int ioasid_attach_data(ioasid_t ioasid, void *data);
> +int ioasid_attach_spid(ioasid_t ioasid, ioasid_t spid);
> +ioasid_t ioasid_find_by_spid(struct ioasid_set *set, ioasid_t spid);
> int ioasid_register_allocator(struct ioasid_allocator_ops *allocator);
> void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator);
> void ioasid_is_in_set(struct ioasid_set *set, ioasid_t ioasid);
> @@ -136,5 +138,15 @@ static inline int ioasid_attach_data(ioasid_t ioasid, void *data)
> return -ENOTSUPP;
> }
>
> +staic inline int ioasid_attach_spid(ioasid_t ioasid, ioasid_t spid)
> +{
> + return -ENOTSUPP;
> +}
> +
> +static inline ioasid_t ioasid_find_by_spid(struct ioasid_set *set, ioasid_t spid)
> +{
> + return -ENOTSUPP;
> +}
> +
> #endif /* CONFIG_IOASID */
> #endif /* __LINUX_IOASID_H */
>
Thanks
Eric
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next prev parent reply other threads:[~2020-09-01 15:39 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-22 4:35 [PATCH v2 0/9] IOASID extensions for guest SVA Jacob Pan
2020-08-22 4:35 ` [PATCH v2 1/9] docs: Document IO Address Space ID (IOASID) APIs Jacob Pan
2020-08-23 7:05 ` Lu Baolu
2020-08-28 17:01 ` Jacob Pan
2020-08-24 10:32 ` Jean-Philippe Brucker
2020-08-27 16:21 ` Auger Eric
2020-09-01 16:56 ` Jacob Pan
2020-09-07 8:03 ` Auger Eric
2020-09-08 17:29 ` Jacob Pan
2020-08-28 22:24 ` Jacob Pan
2020-08-22 4:35 ` [PATCH v2 2/9] iommu/ioasid: Rename ioasid_set_data() Jacob Pan
2020-08-24 18:29 ` Jean-Philippe Brucker
2020-09-01 11:51 ` Auger Eric
2020-08-22 4:35 ` [PATCH v2 3/9] iommu/ioasid: Introduce ioasid_set APIs Jacob Pan
2020-08-22 12:53 ` kernel test robot
2020-08-24 2:24 ` Lu Baolu
2020-09-01 21:28 ` Jacob Pan
2020-09-02 2:39 ` Lu Baolu
2020-08-24 18:28 ` Jean-Philippe Brucker
2020-08-24 18:30 ` Randy Dunlap
2020-09-02 21:46 ` Jacob Pan
2020-08-24 18:34 ` Randy Dunlap
2020-09-02 21:47 ` Jacob Pan
2020-09-02 21:44 ` Jacob Pan
2020-09-01 11:51 ` Auger Eric
2020-09-03 21:07 ` Jacob Pan
2020-09-07 8:04 ` Auger Eric
2020-08-22 4:35 ` [PATCH v2 4/9] iommu/ioasid: Add reference couting functions Jacob Pan
2020-08-24 2:26 ` Lu Baolu
2020-08-25 10:20 ` Jean-Philippe Brucker
2020-08-25 10:19 ` Jean-Philippe Brucker
2020-09-08 20:30 ` Jacob Pan
2020-09-01 12:13 ` Auger Eric
2020-09-08 20:49 ` Jacob Pan
2020-09-24 18:29 ` Shameerali Kolothum Thodi
2020-08-22 4:35 ` [PATCH v2 5/9] iommu/ioasid: Introduce ioasid_set private ID Jacob Pan
2020-08-22 8:36 ` kernel test robot
2020-08-22 9:03 ` kernel test robot
2020-08-25 10:22 ` Jean-Philippe Brucker
2020-09-08 22:19 ` Jacob Pan
2020-09-01 15:38 ` Auger Eric [this message]
2020-09-08 22:40 ` Jacob Pan
2020-09-10 9:18 ` Auger Eric
2020-08-22 4:35 ` [PATCH v2 6/9] iommu/ioasid: Introduce notification APIs Jacob Pan
2020-08-25 10:26 ` Jean-Philippe Brucker
2020-09-09 20:37 ` Jacob Pan
2020-09-01 16:49 ` Auger Eric
2020-09-09 22:58 ` Jacob Pan
2020-09-10 8:59 ` Auger Eric
2020-08-22 4:35 ` [PATCH v2 7/9] iommu/vt-d: Listen to IOASID notifications Jacob Pan
2020-09-01 17:03 ` Auger Eric
2020-09-10 4:54 ` Jacob Pan
2020-08-22 4:35 ` [PATCH v2 8/9] iommu/vt-d: Send IOASID bind/unbind notifications Jacob Pan
2020-08-22 4:35 ` [PATCH v2 9/9] iommu/vt-d: Store guest PASID during bind Jacob Pan
2020-09-01 17:08 ` Auger Eric
2020-09-10 17:12 ` Jacob Pan
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