From: Joerg Roedel <joro@8bytes.org>
To: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Jerry Snitselaar <jsnitsel@redhat.com>,
Joerg Roedel <jroedel@suse.de>
Subject: [PATCH] iommu: Check for deferred attach in iommu_group_do_dma_attach()
Date: Thu, 4 Jun 2020 11:19:44 +0200 [thread overview]
Message-ID: <20200604091944.26402-1-joro@8bytes.org> (raw)
From: Joerg Roedel <jroedel@suse.de>
The iommu_group_do_dma_attach() must not attach devices which have
deferred_attach set. Otherwise devices could cause IOMMU faults when
re-initialized in a kdump kernel.
Fixes: deac0b3bed26 ("iommu: Split off default domain allocation from group assignment")
Reported-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Tested-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/iommu.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index b5ea203f6c68..5a6d509f72b6 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1680,8 +1680,12 @@ static void probe_alloc_default_domain(struct bus_type *bus,
static int iommu_group_do_dma_attach(struct device *dev, void *data)
{
struct iommu_domain *domain = data;
+ int ret = 0;
- return __iommu_attach_device(domain, dev);
+ if (!iommu_is_attach_deferred(group->domain, dev))
+ ret = __iommu_attach_device(group->domain, dev);
+
+ return ret;
}
static int __iommu_group_dma_attach(struct iommu_group *group)
--
2.26.2
next reply other threads:[~2020-06-04 9:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-04 9:19 Joerg Roedel [this message]
2020-06-04 9:39 ` [PATCH] iommu: Check for deferred attach in iommu_group_do_dma_attach() Joerg Roedel
2020-06-04 12:23 ` kernel test robot
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