From:   Lu Baolu <baolu.lu@linux.intel.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Joerg Roedel <joro@8bytes.org>,
        Alex Williamson <alex.williamson@redhat.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Christoph Hellwig <hch@infradead.org>,
        Kevin Tian <kevin.tian@intel.com>,
        Ashok Raj <ashok.raj@intel.com>
Cc:     Will Deacon <will@kernel.org>, Robin Murphy <robin.murphy@arm.com>,
        Dan Williams <dan.j.williams@intel.com>, rafael@kernel.org,
        Diana Craciun <diana.craciun@oss.nxp.com>,
        Cornelia Huck <cohuck@redhat.com>,
        Eric Auger <eric.auger@redhat.com>,
        Liu Yi L <yi.l.liu@intel.com>,
        Jacob jun Pan <jacob.jun.pan@intel.com>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        Stuart Yoder <stuyoder@gmail.com>,
        Laurentiu Tudor <laurentiu.tudor@nxp.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Li Yang <leoyang.li@nxp.com>,
        Dmitry Osipenko <digetx@gmail.com>,
        iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org,
        kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
        Lu Baolu <baolu.lu@linux.intel.com>
Subject: [PATCH v3 08/18] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming
Date:   Mon,  6 Dec 2021 09:58:53 +0800
Message-Id: <20211206015903.88687-9-baolu.lu@linux.intel.com>
In-Reply-To: <20211206015903.88687-1-baolu.lu@linux.intel.com>
References: <20211206015903.88687-1-baolu.lu@linux.intel.com>
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The pci_dma_configure() marks the iommu_group as containing only devices
with kernel drivers that manage DMA. Avoid this default behavior for the
pci_stub because it does not program any DMA itself.  This allows the
pci_stub still able to be used by the admin to block driver binding after
applying the DMA ownership to vfio.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/pci/pci-stub.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/pci-stub.c b/drivers/pci/pci-stub.c
index e408099fea52..14b9b9f2ad2b 100644
--- a/drivers/pci/pci-stub.c
+++ b/drivers/pci/pci-stub.c
@@ -36,6 +36,7 @@ static struct pci_driver stub_driver = {
 	.name		= "pci-stub",
 	.id_table	= NULL,	/* only dynamic id's */
 	.probe		= pci_stub_probe,
+	.suppress_auto_claim_dma_owner = true,
 };
 
 static int __init pci_stub_init(void)
-- 
2.25.1