linux-kernel - [PATCH v3 14/14] iommu/vt-d: Store guest PASID during bind

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Message-Id: <1601329121-36979-15-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Mon, 28 Sep 2020 14:38:41 -0700
From:   Jacob Pan <jacob.pan.linux@...il.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-api@...r.kernel.org,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Yi Liu <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, Wu Hao <hao.wu@...el.com>,
        Yi Sun <yi.y.sun@...el.com>, Dave Jiang <dave.jiang@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: [PATCH v3 14/14] iommu/vt-d: Store guest PASID during bind

IOASID core maintains the guest-host mapping in the form of SPID and
IOASID. This patch assigns the guest PASID (if valid) as SPID while
binding guest page table with a host PASID. This mapping will be used
for lookup and notifications.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/intel/svm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 8f886718df83..e18f8b5af9ba 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -98,6 +98,7 @@ static inline bool intel_svm_capable(struct intel_iommu *iommu)
 static inline void intel_svm_drop_pasid(ioasid_t pasid)
 {
 	ioasid_detach_data(pasid);
+	ioasid_detach_spid(pasid);
 	ioasid_put(NULL, pasid);
 }
 
@@ -425,6 +426,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
 		if (data->flags & IOMMU_SVA_GPASID_VAL) {
 			svm->gpasid = data->gpasid;
 			svm->flags |= SVM_FLAG_GUEST_PASID;
+			ioasid_attach_spid(data->hpasid, data->gpasid);
 		}
 		ioasid_attach_data(data->hpasid, svm);
 		ioasid_get(NULL, svm->pasid);
-- 
2.7.4