On Wed, Dec 17, 2014 at 11:43:36AM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@xxxxxxx>
>
> Since commit 1196c2f a domain is only destroyed in the
> notifier path if it is hot-unplugged. This caused a
> domain leakage in iommu_attach_device when a driver was
> unbound from the device and bound to VFIO. In this case the
> device is attached to a new domain and unlinked from the old
> domain. At this point nothing points to the old domain
> anymore and its memory is leaked.
> Fix this by explicitly freeing the old domain in
> iommu_attach_domain.
>
> Fixes: 1196c2f (iommu/vt-d: Fix dmar_domain leak in iommu_attach_device)
> Cc: <stable@xxxxxxxxxxxxxxx> # v3.18
> Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
> ---
> drivers/iommu/intel-iommu.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 1232336..7610121 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -4428,6 +4428,10 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
> domain_remove_one_dev_info(old_domain, dev);
> else
> domain_remove_dev_info(old_domain);
> +
> + if (!domain_type_is_vm_or_si(old_domain) &&
> + list_empty(&old_domain->devices))
> + domain_exit(old_domain);
> }
> }
>
> --
> 1.9.1
Joerg,
Before applying this change on a 3.18-rc7 kernel layered on a
RHEL 7.0 root disk, I was able to reproduce the memory
leak that Alex reported when powering on/off a VM w/ a PCI
device assigned to it.
After applying this change, I don't see the memory leak anymore.
Instrumentation shows the new code is being invoked during power on
of the VM.
Looks good.
Thanks!
Tested-by: Jerry Hoemann <jerry.hoemann@xxxxxx>
--
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Jerry Hoemann Software Engineer Hewlett-Packard
3404 E Harmony Rd. MS 36 phone: (970) 898-1022
Ft. Collins, CO 80528 FAX: (970) 898-0707
email: jerry.hoemann@xxxxxx
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