linux-kernel - [PATCH 10/13] iommu/vt-d: Make identity_domain_set_dev

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Message-ID: <20241108021406.173972-11-baolu.lu@linux.intel.com>
Date: Fri,  8 Nov 2024 10:14:01 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>
Cc: Jason Gunthorpe <jgg@...dia.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Yi Liu <yi.l.liu@...el.com>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 10/13] iommu/vt-d: Make identity_domain_set_dev_pasid() to handle domain replacement

From: Yi Liu <yi.l.liu@...el.com>

Let identity_domain_set_dev_pasid() call the pasid replace helpers hence
be able to do domain replacement.

Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Yi Liu <yi.l.liu@...el.com>
Link: https://lore.kernel.org/r/20241107122234.7424-11-yi.l.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 251cfebe6226..ba984cb4aa44 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1778,6 +1778,17 @@ static int domain_setup_second_level(struct intel_iommu *iommu,
 						pasid);
 }
 
+static int domain_setup_passthrough(struct intel_iommu *iommu,
+				    struct device *dev, ioasid_t pasid,
+				    struct iommu_domain *old)
+{
+	if (!old)
+		return intel_pasid_setup_pass_through(iommu, dev, pasid);
+	return intel_pasid_replace_pass_through(iommu, dev,
+						iommu_domain_did(old, iommu),
+						pasid);
+}
+
 static int domain_setup_first_level(struct intel_iommu *iommu,
 				    struct dmar_domain *domain,
 				    struct device *dev,
@@ -4423,11 +4434,17 @@ static int identity_domain_set_dev_pasid(struct iommu_domain *domain,
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 	struct intel_iommu *iommu = info->iommu;
+	int ret;
 
 	if (!pasid_supported(iommu) || dev_is_real_dma_subdevice(dev))
 		return -EOPNOTSUPP;
 
-	return intel_pasid_setup_pass_through(iommu, dev, pasid);
+	ret = domain_setup_passthrough(iommu, dev, pasid, old);
+	if (ret)
+		return ret;
+
+	domain_remove_dev_pasid(old, dev, pasid);
+	return 0;
 }
 
 static struct iommu_domain identity_domain = {
-- 
2.43.0