From: Auger Eric <eric.auger@redhat.com>
To: "Tian, Kevin" <kevin.tian@intel.com>,
Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
"eric.auger.pro@gmail.com" <eric.auger.pro@gmail.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
"joro@8bytes.org" <joro@8bytes.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>,
"yi.l.liu@linux.intel.com" <yi.l.liu@linux.intel.com>,
"will.deacon@arm.com" <will.deacon@arm.com>,
"robin.murphy@arm.com" <robin.murphy@arm.com>
Cc: "marc.zyngier@arm.com" <marc.zyngier@arm.com>,
"peter.maydell@linaro.org" <peter.maydell@linaro.org>,
"christoffer.dall@arm.com" <christoffer.dall@arm.com>
Subject: Re: [RFC 01/13] iommu: Introduce bind_guest_stage API
Date: Tue, 4 Sep 2018 10:10:56 +0200 [thread overview]
Message-ID: <220e4c2a-d31c-d8fb-2d77-d902d2f13bb2@redhat.com> (raw)
In-Reply-To: <AADFC41AFE54684AB9EE6CBC0274A5D1912EFB76@SHSMSX101.ccr.corp.intel.com>
Hi Kevin,
On 09/04/2018 09:57 AM, Tian, Kevin wrote:
>> From: Auger Eric
>> Sent: Friday, August 31, 2018 9:52 PM
>>
>> Hi Jean-Philippe,
>>
>> On 08/31/2018 03:11 PM, Jean-Philippe Brucker wrote:
>>> Hi Eric,
>>>
>>> On 23/08/18 16:25, Auger Eric wrote:
>>>>> +int iommu_bind_guest_stage(struct iommu_domain *domain, struct
>> device *dev,
>>>>> + struct iommu_guest_stage_config *cfg)
>>>
>>> About the name change from iommu_bind_pasid_table: is the intent to
>>> reuse this API for SMMUv2, which supports nested but not PASID? Seems
>>> like a good idea but "iommu_bind_table" may be better since "stage" is
>>> only used by Arm.
>>
>> At the moment I don't target SMUv2 but just SMMUv3. My focus was on
>> nested stage enablement without enabling the multi-CD feature (PASID),
>> whish is not supported by the QEMU vSMMUv3. Afterwards I realized that
>> basically we are pointing to a CD or PASID table and that's about the
>> same. I don't have a strong opinion on the name, iommu_bind_guest_table
>> or iommu_bind_pasid_table would be fine with me. Indeed "stage" is ARM
>> vocable (level for Intel?)
>
> Intel uses first level/second level.
>
> iommu_bind_table is a bit confusing. what should people take table as?
> there is PASID table. there is also page table linked in each stage/level. and
> maybe other tables in vendor-specific definition.
>
> to me iommu_bind_pasid_table is still clearer. anyway in other places
> we've used pasid explicitly in vfio/iommu APIs, then it should be general
> enough to represent various implementations.
Fine for me.
However I I would suggest to rename the original iommu_sva_invalidate
into something that is SVA unrelated. iommu_tlb_invalidate is not OK as
this API also is used to invalidate context caches - which are not
iotlbs -. What about iommu_cache_invalidate?
At least we must clarify that this API can be used for something else
than SVA enablement.
Thanks
Eric
>
> Thanks
> Kevin
>
>
>
next prev parent reply other threads:[~2018-09-04 8:11 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1535026656-8450-1-git-send-email-eric.auger@redhat.com>
[not found] ` <1535026656-8450-2-git-send-email-eric.auger@redhat.com>
2018-08-23 15:25 ` [RFC 01/13] iommu: Introduce bind_guest_stage API Auger Eric
2018-08-31 13:11 ` Jean-Philippe Brucker
2018-08-31 13:52 ` Auger Eric
2018-09-03 12:19 ` Jean-Philippe Brucker
2018-09-04 7:57 ` Tian, Kevin
2018-09-04 8:10 ` Auger Eric [this message]
2018-09-04 8:34 ` Tian, Kevin
2018-09-04 8:41 ` Auger Eric
2018-09-04 8:43 ` Tian, Kevin
2018-09-04 9:53 ` Jean-Philippe Brucker
2018-09-05 0:36 ` Tian, Kevin
[not found] ` <A2975661238FB949B60364EF0F2C257439CCE9EE@SHSMSX104.ccr.corp.intel.com>
2018-08-24 13:20 ` Auger Eric
[not found] ` <1535026656-8450-3-git-send-email-eric.auger@redhat.com>
2018-08-31 13:17 ` [RFC 02/13] iommu: Introduce tlb_invalidate API Jean-Philippe Brucker
2018-08-31 14:07 ` Auger Eric
2018-09-03 12:28 ` Jean-Philippe Brucker
2018-09-03 12:41 ` Auger Eric
2018-09-03 13:41 ` Jean-Philippe Brucker
[not found] ` <1535026656-8450-10-git-send-email-eric.auger@redhat.com>
2018-08-31 13:20 ` [RFC 09/13] iommu/smmuv3: Get prepared for nested stage support Jean-Philippe Brucker
2018-08-31 14:11 ` Auger Eric
2018-09-03 12:29 ` Jean-Philippe Brucker
2018-09-03 12:48 ` Auger Eric
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=220e4c2a-d31c-d8fb-2d77-d902d2f13bb2@redhat.com \
--to=eric.auger@redhat.com \
--cc=alex.williamson@redhat.com \
--cc=christoffer.dall@arm.com \
--cc=eric.auger.pro@gmail.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jacob.jun.pan@linux.intel.com \
--cc=jean-philippe.brucker@arm.com \
--cc=joro@8bytes.org \
--cc=kevin.tian@intel.com \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-kernel@vger.kernel.org \
--cc=marc.zyngier@arm.com \
--cc=peter.maydell@linaro.org \
--cc=robin.murphy@arm.com \
--cc=will.deacon@arm.com \
--cc=yi.l.liu@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).