linux-kernel - [PATCH 4/4] vfio: Do not allocate domain if broken_unmanaged

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Message-ID: <42f5cec9d3f03eab3af9509bd5a730f6a1414989.1674849118.git.nicolinc@nvidia.com>
Date:   Fri, 27 Jan 2023 12:04:20 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <jgg@...dia.com>, <kevin.tian@...el.com>, <robin.murphy@....com>,
        <joro@...tes.org>, <will@...nel.org>, <agross@...nel.org>,
        <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <yong.wu@...iatek.com>, <matthias.bgg@...il.com>,
        <thierry.reding@...il.com>, <alex.williamson@...hat.com>,
        <cohuck@...hat.com>
CC:     <vdumpa@...dia.com>, <jonathanh@...dia.com>,
        <iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-tegra@...r.kernel.org>, <kvm@...r.kernel.org>
Subject: [PATCH 4/4] vfio: Do not allocate domain if broken_unmanaged_domain

Add a sanity of the broken_unmanaged_domain flag to reject the use of
vfio_iommu_type1 in the early stage, if the flag is set by the iommu
driver.

Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/vfio/vfio_iommu_type1.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 23c24fe98c00..6ec238aefe89 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2170,7 +2170,10 @@ static int vfio_iommu_domain_alloc(struct device *dev, void *data)
 {
 	struct iommu_domain **domain = data;
 
-	*domain = iommu_domain_alloc(dev->bus);
+	if (device_iommu_unmanaged_supported(dev))
+		*domain = iommu_domain_alloc(dev->bus);
+	else
+		*domain = NULL;
 	return 1; /* Don't iterate */
 }
 
-- 
2.39.1