From: Auger Eric <eric.auger@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>,
Liu Yi L <yi.l.liu@intel.com>
Cc: jean-philippe@linaro.org, kevin.tian@intel.com,
ashok.raj@intel.com, kvm@vger.kernel.org, stefanha@gmail.com,
jun.j.tian@intel.com, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, yi.y.sun@intel.com,
hao.wu@intel.com
Subject: Re: [PATCH v6 08/15] iommu: Pass domain to sva_unbind_gpasid()
Date: Fri, 21 Aug 2020 15:09:29 +0200 [thread overview]
Message-ID: <7db3f15c-09e3-6a52-352a-c9a499895922@redhat.com> (raw)
In-Reply-To: <20200820150619.5dc1ec7a@x1.home>
Hi,
On 8/20/20 11:06 PM, Alex Williamson wrote:
> On Mon, 27 Jul 2020 23:27:37 -0700
> Liu Yi L <yi.l.liu@intel.com> wrote:
>
>> From: Yi Sun <yi.y.sun@intel.com>
>>
>> Current interface is good enough for SVA virtualization on an assigned
>> physical PCI device, but when it comes to mediated devices, a physical
>> device may attached with multiple aux-domains. Also, for guest unbind,
>
> s/may/may be/
>
>> the PASID to be unbind should be allocated to the VM. This check requires
>> to know the ioasid_set which is associated with the domain.
>>
>> So this interface needs to pass in domain info. Then the iommu driver is
>> able to know which domain will be used for the 2nd stage translation of
>> the nesting mode and also be able to do PASID ownership check. This patch
>> passes @domain per the above reason. Also, the prototype of &pasid is
>> changed frnt" to "u32" as the below link.
>
> s/frnt"/from an "int"/
>
>> https://lore.kernel.org/kvm/27ac7880-bdd3-2891-139e-b4a7cd18420b@redhat.com/
>
> This is really confusing, the link is to Eric's comment asking that the
> conversion from (at the time) int to ioasid_t be included in the commit
> log. The text here implies that it's pointing to some sort of
> justification for the change, which it isn't. It just notes that it
> happened, not why it happened, with a mostly irrelevant link.
>
>> Cc: Kevin Tian <kevin.tian@intel.com>
>> CC: Jacob Pan <jacob.jun.pan@linux.intel.com>
>> Cc: Alex Williamson <alex.williamson@redhat.com>
>> Cc: Eric Auger <eric.auger@redhat.com>
>> Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>
>> Cc: Joerg Roedel <joro@8bytes.org>
>> Cc: Lu Baolu <baolu.lu@linux.intel.com>
>> Reviewed-by: Eric Auger <eric.auger@redhat.com>
>> Signed-off-by: Yi Sun <yi.y.sun@intel.com>
>> Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
>> ---
>> v5 -> v6:
>> *) use "u32" prototype for @pasid.
>> *) add review-by from Eric Auger.
>
> I'd probably hold off on adding Eric's R-b given the additional change
> in this version FWIW. Thanks,
Yep I did not notice that change given the R-b was applied ;-)
Thanks
Eric
>
> Alex
>
>> v2 -> v3:
>> *) pass in domain info only
>> *) use u32 for pasid instead of int type
>>
>> v1 -> v2:
>> *) added in v2.
>> ---
>> drivers/iommu/intel/svm.c | 3 ++-
>> drivers/iommu/iommu.c | 2 +-
>> include/linux/intel-iommu.h | 3 ++-
>> include/linux/iommu.h | 3 ++-
>> 4 files changed, 7 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
>> index c27d16a..c85b8d5 100644
>> --- a/drivers/iommu/intel/svm.c
>> +++ b/drivers/iommu/intel/svm.c
>> @@ -436,7 +436,8 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
>> return ret;
>> }
>>
>> -int intel_svm_unbind_gpasid(struct device *dev, int pasid)
>> +int intel_svm_unbind_gpasid(struct iommu_domain *domain,
>> + struct device *dev, u32 pasid)
>> {
>> struct intel_iommu *iommu = intel_svm_device_to_iommu(dev);
>> struct intel_svm_dev *sdev;
>> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
>> index 1ce2a61..bee79d7 100644
>> --- a/drivers/iommu/iommu.c
>> +++ b/drivers/iommu/iommu.c
>> @@ -2145,7 +2145,7 @@ int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev,
>> if (unlikely(!domain->ops->sva_unbind_gpasid))
>> return -ENODEV;
>>
>> - return domain->ops->sva_unbind_gpasid(dev, data->hpasid);
>> + return domain->ops->sva_unbind_gpasid(domain, dev, data->hpasid);
>> }
>> EXPORT_SYMBOL_GPL(iommu_sva_unbind_gpasid);
>>
>> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
>> index 0d0ab32..f98146b 100644
>> --- a/include/linux/intel-iommu.h
>> +++ b/include/linux/intel-iommu.h
>> @@ -738,7 +738,8 @@ extern int intel_svm_enable_prq(struct intel_iommu *iommu);
>> extern int intel_svm_finish_prq(struct intel_iommu *iommu);
>> int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
>> struct iommu_gpasid_bind_data *data);
>> -int intel_svm_unbind_gpasid(struct device *dev, int pasid);
>> +int intel_svm_unbind_gpasid(struct iommu_domain *domain,
>> + struct device *dev, u32 pasid);
>> struct iommu_sva *intel_svm_bind(struct device *dev, struct mm_struct *mm,
>> void *drvdata);
>> void intel_svm_unbind(struct iommu_sva *handle);
>> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
>> index b1ff702..80467fc 100644
>> --- a/include/linux/iommu.h
>> +++ b/include/linux/iommu.h
>> @@ -303,7 +303,8 @@ struct iommu_ops {
>> int (*sva_bind_gpasid)(struct iommu_domain *domain,
>> struct device *dev, struct iommu_gpasid_bind_data *data);
>>
>> - int (*sva_unbind_gpasid)(struct device *dev, int pasid);
>> + int (*sva_unbind_gpasid)(struct iommu_domain *domain,
>> + struct device *dev, u32 pasid);
>>
>> int (*def_domain_type)(struct device *dev);
>>
>
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next prev parent reply other threads:[~2020-08-21 13:09 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-28 6:27 [PATCH v6 00/15] vfio: expose virtual Shared Virtual Addressing to VMs Liu Yi L
2020-07-28 6:27 ` [PATCH v6 01/15] vfio/type1: Refactor vfio_iommu_type1_ioctl() Liu Yi L
2020-07-28 15:53 ` Alex Williamson
2020-07-29 2:20 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 02/15] iommu: Report domain nesting info Liu Yi L
2020-08-13 12:52 ` Auger Eric
2020-08-14 7:15 ` Liu, Yi L
2020-08-16 12:40 ` Auger Eric
2020-08-18 4:21 ` Jacob Pan
2020-08-18 6:59 ` Auger Eric
2020-07-28 6:27 ` [PATCH v6 03/15] iommu/smmu: Report empty " Liu Yi L
2020-07-28 6:27 ` [PATCH v6 04/15] vfio/type1: Report iommu nesting info to userspace Liu Yi L
2020-08-13 13:19 ` Auger Eric
2020-08-14 7:36 ` Liu, Yi L
2020-08-20 19:52 ` Alex Williamson
2020-08-21 0:52 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 05/15] vfio: Add PASID allocation/free support Liu Yi L
2020-08-13 15:07 ` Auger Eric
2020-08-14 7:40 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 06/15] iommu/vt-d: Support setting ioasid set to domain Liu Yi L
2020-08-13 15:06 ` Auger Eric
2020-08-14 8:04 ` Liu, Yi L
2020-08-16 12:42 ` Auger Eric
2020-07-28 6:27 ` [PATCH v6 07/15] vfio/type1: Add VFIO_IOMMU_PASID_REQUEST (alloc/free) Liu Yi L
2020-08-15 16:30 ` Auger Eric
2020-08-17 5:23 ` Liu, Yi L
2020-08-20 20:51 ` Alex Williamson
2020-08-21 0:37 ` Liu, Yi L
2020-08-21 1:49 ` Alex Williamson
2020-08-21 2:18 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 08/15] iommu: Pass domain to sva_unbind_gpasid() Liu Yi L
2020-08-20 21:06 ` Alex Williamson
2020-08-21 0:18 ` Liu, Yi L
2020-08-21 13:09 ` Auger Eric [this message]
2020-07-28 6:27 ` [PATCH v6 09/15] iommu/vt-d: Check ownership for PASIDs from user-space Liu Yi L
2020-08-15 16:30 ` Auger Eric
2020-08-17 5:38 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 10/15] vfio/type1: Support binding guest page tables to PASID Liu Yi L
2020-08-16 11:29 ` Auger Eric
2020-08-17 6:30 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 11/15] vfio/type1: Allow invalidating first-level/stage IOMMU cache Liu Yi L
2020-08-16 11:35 ` Auger Eric
2020-08-17 6:30 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 12/15] vfio/type1: Add vSVA support for IOMMU-backed mdevs Liu Yi L
2020-08-20 21:48 ` Alex Williamson
2020-08-21 0:53 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 13/15] vfio/pci: Expose PCIe PASID capability to guest Liu Yi L
2020-07-28 6:27 ` [PATCH v6 14/15] vfio: Document dual stage control Liu Yi L
2020-08-16 11:51 ` Auger Eric
2020-08-17 7:00 ` Liu, Yi L
2020-08-17 7:40 ` Eric Auger
2020-08-17 7:43 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 15/15] iommu/vt-d: Support reporting nesting capability info Liu Yi L
2020-08-16 12:01 ` Auger Eric
2020-08-17 7:05 ` Liu, Yi L
2020-08-17 7:42 ` Auger Eric
2020-08-17 7:45 ` Liu, Yi L
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