From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Auger Eric <eric.auger@redhat.com>
Cc: iommu@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
Joerg Roedel <joro@8bytes.org>,
David Woodhouse <dwmw2@infradead.org>,
Alex Williamson <alex.williamson@redhat.com>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
Yi Liu <yi.l.liu@intel.com>, "Tian, Kevin" <kevin.tian@intel.com>,
Raj Ashok <ashok.raj@intel.com>,
Christoph Hellwig <hch@infradead.org>,
Lu Baolu <baolu.lu@linux.intel.com>,
Jonathan Cameron <jic23@kernel.org>,
jacob.jun.pan@linux.intel.com
Subject: Re: [PATCH v7 03/11] iommu/vt-d: Add custom allocator for IOASID
Date: Fri, 8 Nov 2019 14:26:50 -0800 [thread overview]
Message-ID: <20191108142650.0121ba2f@jacob-builder> (raw)
In-Reply-To: <d4902c68-57b7-a116-10fa-f4b292304f9a@redhat.com>
On Fri, 8 Nov 2019 11:40:23 +0100
Auger Eric <eric.auger@redhat.com> wrote:
> Hi Jacob,
>
> On 10/24/19 9:54 PM, Jacob Pan wrote:
> > When VT-d driver runs in the guest, PASID allocation must be
> > performed via virtual command interface. This patch registers a
> > custom IOASID allocator which takes precedence over the default
> > XArray based allocator. The resulting IOASID allocation will always
> > come from the host. This ensures that PASID namespace is system-
> > wide.
> >
> > Signed-off-by: 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/Kconfig | 1 +
> > drivers/iommu/intel-iommu.c | 67
> > +++++++++++++++++++++++++++++++++++++++++++++
> > include/linux/intel-iommu.h | 2 ++ 3 files changed, 70
> > insertions(+)
> >
> > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> > index fd50ddffffbf..961fe5795a90 100644
> > --- a/drivers/iommu/Kconfig
> > +++ b/drivers/iommu/Kconfig
> > @@ -211,6 +211,7 @@ config INTEL_IOMMU_SVM
> > bool "Support for Shared Virtual Memory with Intel IOMMU"
> > depends on INTEL_IOMMU && X86
> > select PCI_PASID
> > + select IOASID
> > select MMU_NOTIFIER
> > help
> > Shared Virtual Memory (SVM) provides a facility for
> > devices diff --git a/drivers/iommu/intel-iommu.c
> > b/drivers/iommu/intel-iommu.c index 3f974919d3bd..ced1d89ef977
> > 100644 --- a/drivers/iommu/intel-iommu.c
> > +++ b/drivers/iommu/intel-iommu.c
> > @@ -1706,6 +1706,9 @@ static void free_dmar_iommu(struct
> > intel_iommu *iommu) if (ecap_prs(iommu->ecap))
> > intel_svm_finish_prq(iommu);
> > }
> > + if (ecap_vcs(iommu->ecap) && vccap_pasid(iommu->vccap))
> > +
> > ioasid_unregister_allocator(&iommu->pasid_allocator); +
> > #endif
> > }
> >
> > @@ -4910,6 +4913,44 @@ static int __init
> > probe_acpi_namespace_devices(void) return 0;
> > }
> >
> > +#ifdef CONFIG_INTEL_IOMMU_SVM
> > +static ioasid_t intel_ioasid_alloc(ioasid_t min, ioasid_t max,
> > void *data) +{
> > + struct intel_iommu *iommu = data;
> > + ioasid_t ioasid;
> > +
> > + /*
> > + * VT-d virtual command interface always uses the full 20
> > bit
> > + * PASID range. Host can partition guest PASID range based
> > on
> > + * policies but it is out of guest's control.
> > + */
> > + if (min < PASID_MIN || max > intel_pasid_max_id)>
> > + return INVALID_IOASID;
>
> > +
> > + if (vcmd_alloc_pasid(iommu, &ioasid))
> > + return INVALID_IOASID;
> > +
> > + return ioasid;
> > +}
> > +
> > +static void intel_ioasid_free(ioasid_t ioasid, void *data)
> > +{
> > + struct intel_iommu *iommu = data;
> > +
> > + if (!iommu)
> > + return;
> > + /*
> > + * Sanity check the ioasid owner is done at upper layer,
> > e.g. VFIO
> > + * We can only free the PASID when all the devices are
> > unbond.
> > + */
> > + if (ioasid_find(NULL, ioasid, NULL)) {
> > + pr_alert("Cannot free active IOASID %d\n", ioasid);
> > + return;
> > + }
> > + vcmd_free_pasid(iommu, ioasid);
> > +}
> > +#endif
> > +
> > int __init intel_iommu_init(void)
> > {
> > int ret = -ENODEV;
> > @@ -5020,6 +5061,32 @@ int __init intel_iommu_init(void)
> > "%s", iommu->name);
> > iommu_device_set_ops(&iommu->iommu,
> > &intel_iommu_ops); iommu_device_register(&iommu->iommu);
> > +#ifdef CONFIG_INTEL_IOMMU_SVM
> > + if (ecap_vcs(iommu->ecap) &&
> > vccap_pasid(iommu->vccap)) {
> > + pr_info("Register custom PASID
> > allocator\n");
> > + /*
> > + * Register a custom ASID allocator if we
> > are running
> > + * in a guest, the purpose is to have a
> > system wide PASID
> > + * namespace among all PASID users.
> > + * There can be multiple vIOMMUs in each
> > guest but only
> > + * one allocator is active. All vIOMMU
> > allocators will
> > + * eventually be calling the same host
> > allocator.
> > + */
> > + iommu->pasid_allocator.alloc =
> > intel_ioasid_alloc;
> > + iommu->pasid_allocator.free =
> > intel_ioasid_free;
> > + iommu->pasid_allocator.pdata = (void
> > *)iommu;
> > + ret =
> > ioasid_register_allocator(&iommu->pasid_allocator);
> > + if (ret) {
> > + pr_warn("Custom PASID allocator
> > registeration failed\n");
> nit: registration
> > + /*
> > + * Disable scalable mode on this
> > IOMMU if there
> > + * is no custom allocator. Mixing
> > SM capable vIOMMU
> > + * and non-SM vIOMMU are not
> > supported:
> nit; is not supported. But I guess you will reshape it according to
> previous comments.
Yes, i moved this earlier to avoid the need to clean up after scalable
mode root table is set.
> > + */
> > + intel_iommu_sm = 0;
> > + }
> > + }
> > +#endif
> > }
> >
> > bus_set_iommu(&pci_bus_type, &intel_iommu_ops);
> > diff --git a/include/linux/intel-iommu.h
> > b/include/linux/intel-iommu.h index 1d4b8dcdc5d8..c624733cb2e6
> > 100644 --- a/include/linux/intel-iommu.h
> > +++ b/include/linux/intel-iommu.h
> > @@ -19,6 +19,7 @@
> > #include <linux/iommu.h>
> > #include <linux/io-64-nonatomic-lo-hi.h>
> > #include <linux/dmar.h>
> > +#include <linux/ioasid.h>
> >
> > #include <asm/cacheflush.h>
> > #include <asm/iommu.h>
> > @@ -546,6 +547,7 @@ struct intel_iommu {
> > #ifdef CONFIG_INTEL_IOMMU_SVM
> > struct page_req_dsc *prq;
> > unsigned char prq_name[16]; /* Name for PRQ interrupt */
> > + struct ioasid_allocator_ops pasid_allocator; /* Custom
> > allocator for PASIDs */ #endif
> > struct q_inval *qi; /* Queued invalidation
> > info */ u32 *iommu_state; /* Store iommu states between suspend and
> > resume.*/
>
> Thanks
>
> Eric
>
[Jacob Pan]
next prev parent reply other threads:[~2019-11-08 22:22 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 19:54 [PATCH v7 00/11] Nested Shared Virtual Address (SVA) VT-d support Jacob Pan
2019-10-24 19:54 ` [PATCH v7 01/11] iommu/vt-d: Cache virtual command capability register Jacob Pan
2019-10-25 2:53 ` Lu Baolu
2019-10-25 6:06 ` Tian, Kevin
2019-11-08 10:32 ` Auger Eric
2019-10-24 19:54 ` [PATCH v7 02/11] iommu/vt-d: Enlightened PASID allocation Jacob Pan
2019-10-25 6:19 ` Tian, Kevin
2019-10-29 17:14 ` Jacob Pan
2019-10-29 18:16 ` Tian, Kevin
2019-11-08 10:33 ` Auger Eric
2019-11-08 22:22 ` Jacob Pan
2019-10-24 19:54 ` [PATCH v7 03/11] iommu/vt-d: Add custom allocator for IOASID Jacob Pan
2019-10-25 2:30 ` Lu Baolu
2019-10-25 4:43 ` Jacob Pan
2019-10-25 6:40 ` Tian, Kevin
2019-10-25 14:39 ` Lu Baolu
2019-10-25 15:52 ` Tian, Kevin
2019-10-28 22:49 ` Jacob Pan
2019-10-29 2:22 ` Lu Baolu
2019-10-25 6:31 ` Tian, Kevin
2019-10-28 22:52 ` Jacob Pan
2019-11-08 10:40 ` Auger Eric
2019-11-08 22:26 ` Jacob Pan [this message]
2019-10-24 19:54 ` [PATCH v7 04/11] iommu/vt-d: Replace Intel specific PASID allocator with IOASID Jacob Pan
2019-10-25 5:47 ` Lu Baolu
2019-11-01 18:29 ` Jacob Pan
2019-10-25 6:41 ` Tian, Kevin
2019-10-28 22:46 ` Jacob Pan
2019-11-08 11:30 ` Auger Eric
2019-11-08 22:55 ` Jacob Pan
2019-11-12 9:54 ` Auger Eric
2019-10-24 19:54 ` [PATCH v7 05/11] iommu/vt-d: Move domain helper to header Jacob Pan
2019-10-25 5:26 ` Lu Baolu
2019-10-24 19:54 ` [PATCH v7 06/11] iommu/vt-d: Avoid duplicated code for PASID setup Jacob Pan
2019-10-25 5:32 ` Lu Baolu
2019-10-25 6:42 ` Tian, Kevin
2019-10-28 22:41 ` Jacob Pan
2019-11-12 9:54 ` Auger Eric
2019-10-24 19:55 ` [PATCH v7 07/11] iommu/vt-d: Add nested translation helper function Jacob Pan
2019-10-25 7:04 ` Tian, Kevin
2019-11-01 21:10 ` Jacob Pan
2019-10-25 15:04 ` Lu Baolu
2019-10-25 16:06 ` Jacob Pan
2019-11-08 13:55 ` Auger Eric
2019-10-24 19:55 ` [PATCH v7 08/11] iommu/vt-d: Misc macro clean up for SVM Jacob Pan
2019-10-26 1:00 ` Lu Baolu
2019-10-28 22:38 ` Jacob Pan
2019-10-24 19:55 ` [PATCH v7 09/11] iommu/vt-d: Add bind guest PASID support Jacob Pan
2019-10-25 7:19 ` Tian, Kevin
2019-10-25 17:33 ` Jacob Pan
2019-10-28 6:03 ` Tian, Kevin
2019-10-28 16:02 ` Jacob Pan
2019-10-29 7:57 ` Tian, Kevin
2019-10-29 16:11 ` Jacob Pan
2019-10-29 18:04 ` Tian, Kevin
2019-10-29 2:33 ` Lu Baolu
2019-10-26 2:01 ` Lu Baolu
2019-10-28 22:29 ` Jacob Pan
2019-10-29 2:54 ` Lu Baolu
2019-10-29 4:11 ` Jacob Pan
2019-10-29 5:04 ` Lu Baolu
2019-10-24 19:55 ` [PATCH v7 10/11] iommu/vt-d: Support flushing more translation cache types Jacob Pan
2019-10-25 7:21 ` Tian, Kevin
2019-11-01 21:30 ` Jacob Pan
2019-10-26 2:22 ` Lu Baolu
2019-11-01 21:28 ` Jacob Pan
2019-11-08 16:18 ` Auger Eric
2019-11-08 23:05 ` Jacob Pan
2019-10-24 19:55 ` [PATCH v7 11/11] iommu/vt-d: Add svm/sva invalidate function Jacob Pan
2019-10-25 7:27 ` Tian, Kevin
2019-10-26 2:40 ` Lu Baolu
2019-10-26 7:03 ` Lu Baolu
2019-10-28 6:06 ` Tian, Kevin
2019-10-28 16:10 ` Jacob Pan
2019-10-29 18:52 ` Tian, Kevin
2019-10-29 19:25 ` Jacob Pan
2019-10-28 16:13 ` Jacob Pan
2019-11-12 10:28 ` Auger Eric
2020-02-15 1:18 ` Jacob Pan
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