linux-kernel - [PATCH v2 4/7] iommu: Let iommu.strict override ops->def_domain

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Date:   Wed, 16 Nov 2022 18:16:53 +0100
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>, iommu@...ts.linux.dev,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>
Cc:     Pierre Morel <pmorel@...ux.ibm.com>, linux-s390@...r.kernel.org,
        borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, linux-kernel@...r.kernel.org,
        Julian Ruess <julianr@...ux.ibm.com>
Subject: [PATCH v2 4/7] iommu: Let iommu.strict override ops->def_domain_type

When iommu.strict=1 is set or iommu_set_dma_strict() was called we
should use IOMMU_DOMAIN_DMA irrespective of ops->def_domain_type.

Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
 drivers/iommu/iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 65a3b3d886dc..d9bf94d198df 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1562,6 +1562,9 @@ static int iommu_get_def_domain_type(struct device *dev)
 {
 	const struct iommu_ops *ops = dev_iommu_ops(dev);
 
+	if (iommu_dma_strict)
+		return IOMMU_DOMAIN_DMA;
+
 	if (dev_is_pci(dev) && to_pci_dev(dev)->untrusted)
 		return IOMMU_DOMAIN_DMA;
 
-- 
2.34.1