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From: Oleksandr Tyshchenko <olekstysh@gmail.com>
Subject: IOMMU: always call teardown callback
There is a possible scenario when (d)->need_iommu remains unset
during guest domain execution. For example, when no devices
were assigned to it. Taking into account that teardown callback
is not called when (d)->need_iommu is unset we might have unreleased
resourses after destroying domain.
So, always call teardown callback to roll back actions
that were performed in init callback.
This is XSA-207.
Signed-off-by: Oleksandr Tyshchenko <olekstysh@gmail.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Tested-by: Jan Beulich <jbeulich@suse.com>
Tested-by: Julien Grall <julien.grall@arm.com>
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -244,8 +244,7 @@ void iommu_domain_destroy(struct domain
if ( !iommu_enabled || !dom_iommu(d)->platform_ops )
return;
- if ( need_iommu(d) )
- iommu_teardown(d);
+ iommu_teardown(d);
arch_iommu_domain_destroy(d);
}
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