From: Jacob Pan <jacob.jun.pan@linux.intel.com> To: Jean-Philippe Brucker <jean-philippe@linaro.org> Cc: Joerg Roedel <joro@8bytes.org>, Alex Williamson <alex.williamson@redhat.com>, Lu Baolu <baolu.lu@linux.intel.com>, iommu@lists.linux-foundation.org, LKML <linux-kernel@vger.kernel.org>, David Woodhouse <dwmw2@infradead.org>, 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>, Jonathan Cameron <jic23@kernel.org>, Eric Auger <eric.auger@redhat.com>, jacob.jun.pan@linux.intel.com Subject: Re: [PATCH 08/10] iommu/ioasid: Introduce notifier APIs Date: Fri, 10 Apr 2020 08:43:32 -0700 [thread overview] Message-ID: <20200410084332.6a35a8ca@jacob-builder> (raw) In-Reply-To: <20200401140006.GI882512@myrica> On Wed, 1 Apr 2020 16:00:06 +0200 Jean-Philippe Brucker <jean-philippe@linaro.org> wrote: > On Wed, Mar 25, 2020 at 10:55:29AM -0700, Jacob Pan wrote: > > IOASID users fit into the publisher-subscriber pattern, a system > > wide blocking notifier chain can be used to inform subscribers of > > state changes. Notifier mechanism also abstracts publisher from > > knowing the private context each subcriber may have. > > > > This patch adds APIs and a global notifier chain, a further > > optimization might be per set notifier for ioasid_set aware users. > > > > Usage example: > > KVM register notifier block such that it can keep its guest-host > > PASID translation table in sync with any IOASID updates. > > When you talk about KVM, is it for > > [PATCH 0/7] x86: tag application address space for devices > > or something else as well? (I don't see mentions of KVM in that > series) > Yes, related to this set. This is set is for native ENQCMD support. VMCS use of IOASID notifier is for the guest SVA + ENQCMD. We need to maintain a G-H PASID translation in VMCS PASID translation table. When guest binds a GPASID to a host PASID, this translation table can be updated such that subsequent ENQCMD in the guest can resolve to a host PASID. CH 7.3.1 of DSA spec. https://software.intel.com/sites/default/files/341204-intel-data-streaming-accelerator-spec.pdf > > > > VFIO publish IOASID change by performing alloc/free, bind/unbind > > operations. > > I was rather seeing IOASID as the end of the VFIO-IOMMU-IOASID chain, > putting it in the middle complicates locking. If you only need to FREE > notifier for this calse, maybe VFIO could talk directly to the IOMMU > driver before freeing an IOASID? gpasid_unbind() should already > clear the PASID contexts, no? > Yes, VFIO can track all the PASIDs and make sure they do unbind before free. But that might be more complicated in VFIO, whereas here, when a guest exits, VFIO can just free the entire IOASID set, IOASID will notify IOMMU and do all the cleanup. For maintaining VMCS pasid translation table, KVM still need to know bind/unbind in addition to free events. In addition, we also have VDCM (virtual device composition module) that needs to perform G-H PASID translation and sanity check. VDCM needs the free event only. This is also in the DSA spec above. The use is that when the guest programs a GPASID into a virtual device, VDCM (similar to SRIOV PDEV driver) needs to intercept (via vfio mdev) and translate GPASID to HPASID. > Thanks, > Jean > > > IOMMU driver gets notified when IOASID is freed by VFIO or core mm > > code such that PASID context can be cleaned up. > > > > Signed-off-by: Liu Yi L <yi.l.liu@intel.com> > > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> [Jacob Pan]
WARNING: multiple messages have this Message-ID (diff)
From: Jacob Pan <jacob.jun.pan@linux.intel.com> To: Jean-Philippe Brucker <jean-philippe@linaro.org> Cc: "Tian, Kevin" <kevin.tian@intel.com>, Raj Ashok <ashok.raj@intel.com>, Jean-Philippe Brucker <jean-philippe@linaro.com>, LKML <linux-kernel@vger.kernel.org>, iommu@lists.linux-foundation.org, Alex Williamson <alex.williamson@redhat.com>, David Woodhouse <dwmw2@infradead.org>, Jonathan Cameron <jic23@kernel.org> Subject: Re: [PATCH 08/10] iommu/ioasid: Introduce notifier APIs Date: Fri, 10 Apr 2020 08:43:32 -0700 [thread overview] Message-ID: <20200410084332.6a35a8ca@jacob-builder> (raw) In-Reply-To: <20200401140006.GI882512@myrica> On Wed, 1 Apr 2020 16:00:06 +0200 Jean-Philippe Brucker <jean-philippe@linaro.org> wrote: > On Wed, Mar 25, 2020 at 10:55:29AM -0700, Jacob Pan wrote: > > IOASID users fit into the publisher-subscriber pattern, a system > > wide blocking notifier chain can be used to inform subscribers of > > state changes. Notifier mechanism also abstracts publisher from > > knowing the private context each subcriber may have. > > > > This patch adds APIs and a global notifier chain, a further > > optimization might be per set notifier for ioasid_set aware users. > > > > Usage example: > > KVM register notifier block such that it can keep its guest-host > > PASID translation table in sync with any IOASID updates. > > When you talk about KVM, is it for > > [PATCH 0/7] x86: tag application address space for devices > > or something else as well? (I don't see mentions of KVM in that > series) > Yes, related to this set. This is set is for native ENQCMD support. VMCS use of IOASID notifier is for the guest SVA + ENQCMD. We need to maintain a G-H PASID translation in VMCS PASID translation table. When guest binds a GPASID to a host PASID, this translation table can be updated such that subsequent ENQCMD in the guest can resolve to a host PASID. CH 7.3.1 of DSA spec. https://software.intel.com/sites/default/files/341204-intel-data-streaming-accelerator-spec.pdf > > > > VFIO publish IOASID change by performing alloc/free, bind/unbind > > operations. > > I was rather seeing IOASID as the end of the VFIO-IOMMU-IOASID chain, > putting it in the middle complicates locking. If you only need to FREE > notifier for this calse, maybe VFIO could talk directly to the IOMMU > driver before freeing an IOASID? gpasid_unbind() should already > clear the PASID contexts, no? > Yes, VFIO can track all the PASIDs and make sure they do unbind before free. But that might be more complicated in VFIO, whereas here, when a guest exits, VFIO can just free the entire IOASID set, IOASID will notify IOMMU and do all the cleanup. For maintaining VMCS pasid translation table, KVM still need to know bind/unbind in addition to free events. In addition, we also have VDCM (virtual device composition module) that needs to perform G-H PASID translation and sanity check. VDCM needs the free event only. This is also in the DSA spec above. The use is that when the guest programs a GPASID into a virtual device, VDCM (similar to SRIOV PDEV driver) needs to intercept (via vfio mdev) and translate GPASID to HPASID. > Thanks, > Jean > > > IOMMU driver gets notified when IOASID is freed by VFIO or core mm > > code such that PASID context can be cleaned up. > > > > Signed-off-by: Liu Yi L <yi.l.liu@intel.com> > > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> [Jacob Pan] _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-04-10 15:37 UTC|newest] Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-25 17:55 [PATCH 00/10] IOASID extensions for guest SVA Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-25 17:55 ` [PATCH 01/10] iommu/ioasid: Introduce system-wide capacity Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 8:07 ` Tian, Kevin 2020-03-27 8:07 ` Tian, Kevin 2020-03-27 16:08 ` Jacob Pan 2020-03-27 16:08 ` Jacob Pan 2020-04-01 13:45 ` Jean-Philippe Brucker 2020-04-01 13:45 ` Jean-Philippe Brucker 2020-04-01 22:50 ` Jacob Pan 2020-04-01 22:50 ` Jacob Pan 2020-03-25 17:55 ` [PATCH 02/10] iommu/vt-d: Set IOASID capacity when SVM is enabled Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 8:08 ` Tian, Kevin 2020-03-27 8:08 ` Tian, Kevin 2020-03-25 17:55 ` [PATCH 03/10] iommu/ioasid: Introduce per set allocation APIs Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-26 2:12 ` Lu Baolu 2020-03-26 2:12 ` Lu Baolu 2020-03-26 21:30 ` Jacob Pan 2020-03-26 21:30 ` Jacob Pan 2020-03-27 8:38 ` Tian, Kevin 2020-03-27 8:38 ` Tian, Kevin 2020-03-27 16:59 ` Jacob Pan 2020-03-27 16:59 ` Jacob Pan 2020-03-28 6:32 ` Tian, Kevin 2020-03-28 6:32 ` Tian, Kevin 2020-04-01 13:47 ` Jean-Philippe Brucker 2020-04-01 13:47 ` Jean-Philippe Brucker 2020-04-06 20:02 ` Jacob Pan 2020-04-06 20:02 ` Jacob Pan 2020-04-07 11:01 ` Jean-Philippe Brucker 2020-04-07 11:01 ` Jean-Philippe Brucker 2020-04-21 21:51 ` Jacob Pan 2020-04-21 21:51 ` Jacob Pan 2020-03-25 17:55 ` [PATCH 04/10] iommu/ioasid: Rename ioasid_set_data to avoid confusion with ioasid_set Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 9:35 ` Tian, Kevin 2020-03-27 9:35 ` Tian, Kevin 2020-03-25 17:55 ` [PATCH 05/10] iommu/ioasid: Create an IOASID set for host SVA use Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 9:41 ` Tian, Kevin 2020-03-27 9:41 ` Tian, Kevin 2020-03-27 17:28 ` Jacob Pan 2020-03-27 17:28 ` Jacob Pan 2020-03-28 6:33 ` Tian, Kevin 2020-03-28 6:33 ` Tian, Kevin 2020-04-01 13:53 ` Jean-Philippe Brucker 2020-04-01 13:53 ` Jean-Philippe Brucker 2020-04-06 15:33 ` Jacob Pan 2020-04-06 15:33 ` Jacob Pan 2020-04-07 11:01 ` Jean-Philippe Brucker 2020-04-07 11:01 ` Jean-Philippe Brucker 2020-04-13 22:06 ` Jacob Pan 2020-04-13 22:06 ` Jacob Pan 2020-04-15 15:10 ` Jean-Philippe Brucker 2020-04-15 15:10 ` Jean-Philippe Brucker 2020-03-25 17:55 ` [PATCH 06/10] iommu/ioasid: Convert to set aware allocations Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 9:54 ` Tian, Kevin 2020-03-27 9:54 ` Tian, Kevin 2020-03-27 17:41 ` Jacob Pan 2020-03-27 17:41 ` Jacob Pan 2020-03-28 6:40 ` Tian, Kevin 2020-03-28 6:40 ` Tian, Kevin 2020-04-06 20:07 ` Jacob Pan 2020-04-06 20:07 ` Jacob Pan 2020-04-01 13:55 ` Jean-Philippe Brucker 2020-04-01 13:55 ` Jean-Philippe Brucker 2020-04-01 22:45 ` Jacob Pan 2020-04-01 22:45 ` Jacob Pan 2020-03-25 17:55 ` [PATCH 07/10] iommu/ioasid: Use mutex instead of spinlock Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 9:55 ` Tian, Kevin 2020-03-27 9:55 ` Tian, Kevin 2020-04-01 13:58 ` Jean-Philippe Brucker 2020-04-01 13:58 ` Jean-Philippe Brucker 2020-03-25 17:55 ` [PATCH 08/10] iommu/ioasid: Introduce notifier APIs Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 10:03 ` Tian, Kevin 2020-03-27 10:03 ` Tian, Kevin 2020-03-27 18:36 ` Jacob Pan 2020-03-27 18:36 ` Jacob Pan 2020-03-28 6:43 ` Tian, Kevin 2020-03-28 6:43 ` Tian, Kevin 2020-03-31 15:13 ` Jacob Pan 2020-03-31 15:13 ` Jacob Pan 2020-04-01 14:00 ` Jean-Philippe Brucker 2020-04-01 14:00 ` Jean-Philippe Brucker 2020-04-10 15:43 ` Jacob Pan [this message] 2020-04-10 15:43 ` Jacob Pan 2020-03-25 17:55 ` [PATCH 09/10] iommu/ioasid: Support ioasid_set quota adjustment Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 10:09 ` Tian, Kevin 2020-03-27 10:09 ` Tian, Kevin 2020-03-27 23:30 ` Jacob Pan 2020-03-27 23:30 ` Jacob Pan 2020-03-28 6:44 ` Tian, Kevin 2020-03-28 6:44 ` Tian, Kevin 2020-03-25 17:55 ` [PATCH 10/10] iommu/vt-d: Register PASID notifier for status change Jacob Pan 2020-03-25 17:55 ` Jacob Pan 2020-03-27 10:22 ` Tian, Kevin 2020-03-27 10:22 ` Tian, Kevin 2020-03-27 23:47 ` Jacob Pan 2020-03-27 23:47 ` Jacob Pan 2020-04-01 14:03 ` [PATCH 00/10] IOASID extensions for guest SVA Jean-Philippe Brucker 2020-04-01 14:03 ` Jean-Philippe Brucker 2020-04-01 23:38 ` Jacob Pan 2020-04-01 23:38 ` Jacob Pan 2020-04-02 12:26 ` Jean-Philippe Brucker 2020-04-02 12:26 ` Jean-Philippe Brucker 2020-04-02 16:09 ` Jacob Pan 2020-04-02 16:09 ` Jacob Pan
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