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From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: iommu@lists.linux-foundation.org,
	LKML <linux-kernel@vger.kernel.org>,
	"Lu Baolu" <baolu.lu@linux.intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	David Woodhouse <dwmw2@infradead.org>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
	Raj Ashok <ashok.raj@intel.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Liu@osuosl.org, Jean-Philippe Brucker <jean-philippe@linaro.com>,
	Jonathan Cameron <jic23@kernel.org>
Subject: [PATCH V9 09/10] iommu/vt-d: Add custom allocator for IOASID
Date: Tue, 28 Jan 2020 22:01:52 -0800
Message-ID: <1580277713-66934-10-git-send-email-jacob.jun.pan@linux.intel.com> (raw)
In-Reply-To: <1580277713-66934-1-git-send-email-jacob.jun.pan@linux.intel.com>

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/intel-iommu.c | 84 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/intel-iommu.h |  2 ++
 2 files changed, 86 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index b8aa6479b87f..2f0bf7cc70ce 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1758,6 +1758,9 @@ 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
 }
 
@@ -3294,6 +3297,84 @@ static int copy_translation_tables(struct intel_iommu *iommu)
 	return ret;
 }
 
+#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;
+
+	if (!iommu)
+		return INVALID_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 unbound.
+	 */
+	if (ioasid_find(NULL, ioasid, NULL)) {
+		pr_alert("Cannot free active IOASID %d\n", ioasid);
+		return;
+	}
+	vcmd_free_pasid(iommu, ioasid);
+}
+
+static void register_pasid_allocator(struct intel_iommu *iommu)
+{
+	/*
+	 * If we are running in the host, no need for custom allocator
+	 * in that PASIDs are allocated from the host system-wide.
+	 */
+	if (!cap_caching_mode(iommu->cap))
+		return;
+
+	if (!sm_supported(iommu)) {
+		pr_warn("VT-d Scalable Mode not enabled, no PASID allocation\n");
+		return;
+	}
+
+	/*
+	 * Register a custom PASID allocator if we are running in a guest,
+	 * guest PASID must be obtained via virtual command interface.
+	 * 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.
+	 */
+	if (ecap_vcs(iommu->ecap) && vccap_pasid(iommu->vccap)) {
+		pr_info("Register custom PASID allocator\n");
+		iommu->pasid_allocator.alloc = intel_ioasid_alloc;
+		iommu->pasid_allocator.free = intel_ioasid_free;
+		iommu->pasid_allocator.pdata = (void *)iommu;
+		if (ioasid_register_allocator(&iommu->pasid_allocator)) {
+			pr_warn("Custom PASID allocator failed, scalable mode disabled\n");
+			/*
+			 * Disable scalable mode on this IOMMU if there
+			 * is no custom allocator. Mixing SM capable vIOMMU
+			 * and non-SM vIOMMU are not supported.
+			 */
+			intel_iommu_sm = 0;
+		}
+	}
+}
+#endif
+
 static int __init init_dmars(void)
 {
 	struct dmar_drhd_unit *drhd;
@@ -3411,6 +3492,9 @@ static int __init init_dmars(void)
 	 */
 	for_each_active_iommu(iommu, drhd) {
 		iommu_flush_write_buffer(iommu);
+#ifdef CONFIG_INTEL_IOMMU_SVM
+		register_pasid_allocator(iommu);
+#endif
 		iommu_set_root_entry(iommu);
 		iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
 		iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 0df734db19a9..7955afc1ec94 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>
@@ -561,6 +562,7 @@ 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.*/
-- 
2.7.4

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  parent reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-29  6:01 [PATCH V9 00/10] Nested Shared Virtual Address (SVA) VT-d support Jacob Pan
2020-01-29  6:01 ` [PATCH V9 01/10] iommu/vt-d: Move domain helper to header Jacob Pan
2020-01-29  6:01 ` [PATCH V9 02/10] iommu/uapi: Define a mask for bind data Jacob Pan
2020-02-12 12:43   ` Auger Eric
2020-03-20 21:35     ` Jacob Pan
2020-01-29  6:01 ` [PATCH V9 03/10] iommu/vt-d: Add nested translation helper function Jacob Pan
2020-02-12 12:43   ` Auger Eric
2020-02-24 22:55     ` Jacob Pan
2020-01-29  6:01 ` [PATCH V9 04/10] iommu/vt-d: Add bind guest PASID support Jacob Pan
2020-01-30  7:22   ` Lu Baolu
2020-01-31 21:48     ` Jacob Pan
2020-01-29  6:01 ` [PATCH V9 05/10] iommu/vt-d: Support flushing more translation cache types Jacob Pan
2020-02-12 12:55   ` Auger Eric
2020-02-14 23:27     ` Jacob Pan
2020-02-25  8:32       ` Auger Eric
2020-01-29  6:01 ` [PATCH V9 06/10] iommu/vt-d: Add svm/sva invalidate function Jacob Pan
2020-02-12 13:13   ` Auger Eric
2020-02-14 23:48     ` Jacob Pan
2020-02-21  6:34   ` Liu, Yi L
2020-02-21 19:08     ` Jacob Pan
2020-01-29  6:01 ` [PATCH V9 07/10] iommu/vt-d: Cache virtual command capability register Jacob Pan
2020-02-12 13:00   ` Auger Eric
2020-02-21 20:20     ` Jacob Pan
2020-01-29  6:01 ` [PATCH V9 08/10] iommu/vt-d: Enlightened PASID allocation Jacob Pan
2020-01-29  6:01 ` Jacob Pan [this message]
2020-01-29  6:01 ` [PATCH V9 10/10] iommu/vt-d: Report PASID format as domain attribute Jacob Pan
2020-01-30  7:54   ` Lu Baolu
2020-02-04  5:43     ` Jacob Pan
2020-01-29 12:18 ` [PATCH V9 00/10] Nested Shared Virtual Address (SVA) VT-d support Liu, Yi L

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