From: "Liu, Yi L" <yi.l.liu@intel.com>
To: Auger Eric <eric.auger@redhat.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"baolu.lu@linux.intel.com" <baolu.lu@linux.intel.com>,
"joro@8bytes.org" <joro@8bytes.org>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
"jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
"Tian, Jun J" <jun.j.tian@intel.com>,
"Sun, Yi Y" <yi.y.sun@intel.com>,
"jean-philippe@linaro.org" <jean-philippe@linaro.org>,
"peterx@redhat.com" <peterx@redhat.com>,
"Wu, Hao" <hao.wu@intel.com>,
"stefanha@gmail.com" <stefanha@gmail.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v4 06/15] iommu/vt-d: Support setting ioasid set to domain
Date: Tue, 7 Jul 2020 09:37:35 +0000 [thread overview]
Message-ID: <DM5PR11MB14353BF4E197D947CFF720BAC3660@DM5PR11MB1435.namprd11.prod.outlook.com> (raw)
In-Reply-To: <d47367ab-f986-4c09-2578-3e364aa57835@redhat.com>
Hi Eric,
> From: Auger Eric <eric.auger@redhat.com>
> Sent: Monday, July 6, 2020 10:52 PM
>
> Hi Yi,
>
> On 7/4/20 1:26 PM, Liu Yi L wrote:
> > From IOMMU p.o.v., PASIDs allocated and managed by external components
> > (e.g. VFIO) will be passed in for gpasid_bind/unbind operation. IOMMU
> > needs some knowledge to check the PASID ownership, hence add an interface
> > for those components to tell the PASID owner.
> >
> > In latest kernel design, PASID ownership is managed by IOASID set where
> > the PASID is allocated from. This patch adds support for setting ioasid
> > set ID to the domains used for nesting/vSVA. Subsequent SVA operations
> > on the PASID will be checked against its IOASID set for proper ownership.
> >
> > 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>
> > Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> > ---
> > drivers/iommu/intel/iommu.c | 16 ++++++++++++++++
> > include/linux/intel-iommu.h | 4 ++++
> > include/linux/iommu.h | 1 +
> > 3 files changed, 21 insertions(+)
> >
> > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> > index 62ebe01..89d708d 100644
> > --- a/drivers/iommu/intel/iommu.c
> > +++ b/drivers/iommu/intel/iommu.c
> > @@ -1793,6 +1793,7 @@ static struct dmar_domain *alloc_domain(int flags)
> > if (first_level_by_default())
> > domain->flags |= DOMAIN_FLAG_USE_FIRST_LEVEL;
> > domain->has_iotlb_device = false;
> > + domain->ioasid_sid = INVALID_IOASID_SET;
> > INIT_LIST_HEAD(&domain->devices);
> >
> > return domain;
> > @@ -6039,6 +6040,21 @@ intel_iommu_domain_set_attr(struct iommu_domain
> *domain,
> > }
> > spin_unlock_irqrestore(&device_domain_lock, flags);
> > break;
> > + case DOMAIN_ATTR_IOASID_SID:
> no need to take the device_domain_lock?
oh, yes. thanks for spotting it.
> > + if (!(dmar_domain->flags & DOMAIN_FLAG_NESTING_MODE)) {
> > + ret = -ENODEV;
> > + break;
> > + }
> > + if ((dmar_domain->ioasid_sid != INVALID_IOASID_SET) &&
> > + (dmar_domain->ioasid_sid != (*(int *) data))) {
> storing *(int *) data) in a local variable would increase the
> readability of the code I think.
will do it. :-)
Regards,
Yi Liu
> > + pr_warn_ratelimited("multi ioasid_set (%d:%d) setting",
> > + dmar_domain->ioasid_sid,
> > + (*(int *) data));
> > + ret = -EBUSY;
> > + break;
> > + }
> > + dmar_domain->ioasid_sid = *(int *) data;
> > + break;
> > default:
> > ret = -EINVAL;
> > break;
> > diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> > index 3f23c26..0d0ab32 100644
> > --- a/include/linux/intel-iommu.h
> > +++ b/include/linux/intel-iommu.h
> > @@ -549,6 +549,10 @@ struct dmar_domain {
> > 2 == 1GiB, 3 == 512GiB, 4 == 1TiB */
> > u64 max_addr; /* maximum mapped address */
> >
> > + int ioasid_sid; /*
> > + * the ioasid set which tracks all
> > + * PASIDs used by the domain.
> > + */
> > int default_pasid; /*
> > * The default pasid used for non-SVM
> > * traffic on mediated devices.
> > diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> > index 2567c33..21d32be 100644
> > --- a/include/linux/iommu.h
> > +++ b/include/linux/iommu.h
> > @@ -124,6 +124,7 @@ enum iommu_attr {
> > DOMAIN_ATTR_FSL_PAMUV1,
> > DOMAIN_ATTR_NESTING, /* two stages of translation */
> > DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
> > + DOMAIN_ATTR_IOASID_SID,
> > DOMAIN_ATTR_MAX,
> > };
> >
> >
> Thanks
>
> Eric
next prev parent reply other threads:[~2020-07-07 9:37 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-04 11:26 [PATCH v4 00/15] vfio: expose virtual Shared Virtual Addressing to VMs Liu Yi L
2020-07-04 11:26 ` [PATCH v4 01/15] vfio/type1: Refactor vfio_iommu_type1_ioctl() Liu Yi L
2020-07-06 9:34 ` Auger Eric
2020-07-06 12:27 ` Liu, Yi L
2020-07-06 12:55 ` Auger Eric
2020-07-06 13:00 ` Liu, Yi L
2020-07-04 11:26 ` [PATCH v4 02/15] iommu: Report domain nesting info Liu Yi L
2020-07-06 9:34 ` Auger Eric
2020-07-06 12:20 ` Liu, Yi L
2020-07-06 13:00 ` Auger Eric
2020-07-06 13:17 ` Liu, Yi L
2020-07-04 11:26 ` [PATCH v4 03/15] iommu/smmu: Report empty " Liu Yi L
2020-07-06 10:37 ` Auger Eric
2020-07-06 12:46 ` Liu, Yi L
2020-07-06 13:21 ` Auger Eric
2020-07-06 13:26 ` Liu, Yi L
2020-07-04 11:26 ` [PATCH v4 04/15] vfio/type1: Report iommu nesting info to userspace Liu Yi L
2020-07-06 10:37 ` Auger Eric
2020-07-06 13:10 ` Liu, Yi L
2020-07-06 13:45 ` Auger Eric
2020-07-07 9:31 ` Liu, Yi L
2020-07-08 8:08 ` Liu, Yi L
2020-07-08 19:29 ` Alex Williamson
2020-07-09 0:25 ` Liu, Yi L
2020-07-06 14:06 ` Auger Eric
2020-07-07 9:34 ` Liu, Yi L
2020-07-04 11:26 ` [PATCH v4 05/15] vfio: Add PASID allocation/free support Liu Yi L
2020-07-06 14:52 ` Auger Eric
2020-07-07 9:45 ` Liu, Yi L
2020-07-04 11:26 ` [PATCH v4 06/15] iommu/vt-d: Support setting ioasid set to domain Liu Yi L
2020-07-06 14:52 ` Auger Eric
2020-07-07 9:37 ` Liu, Yi L [this message]
2020-07-04 11:26 ` [PATCH v4 07/15] vfio/type1: Add VFIO_IOMMU_PASID_REQUEST (alloc/free) Liu Yi L
2020-07-06 15:17 ` Auger Eric
2020-07-07 9:51 ` Liu, Yi L
2020-07-04 11:26 ` [PATCH v4 08/15] iommu: Pass domain to sva_unbind_gpasid() Liu Yi L
2020-07-04 11:26 ` [PATCH v4 09/15] iommu/vt-d: Check ownership for PASIDs from user-space Liu Yi L
2020-07-04 11:26 ` [PATCH v4 10/15] vfio/type1: Support binding guest page tables to PASID Liu Yi L
2020-07-04 11:26 ` [PATCH v4 11/15] vfio/type1: Allow invalidating first-level/stage IOMMU cache Liu Yi L
2020-07-04 11:26 ` [PATCH v4 12/15] vfio/type1: Add vSVA support for IOMMU-backed mdevs Liu Yi L
2020-07-04 11:26 ` [PATCH v4 13/15] vfio/pci: Expose PCIe PASID capability to guest Liu Yi L
2020-07-04 11:26 ` [PATCH v4 14/15] vfio: Document dual stage control Liu Yi L
2020-07-04 11:26 ` [PATCH v4 15/15] iommu/vt-d: Support reporting nesting capability info Liu Yi L
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