This is a note to let you know that I've just added the patch titled
[stable PATCH] iommu/vt-d: Fix missing IOTLB flush in intel_iommu_unmap()
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-vt-d-fix-missing-iotlb-flush-in-intel_iommu_unmap.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From [email protected] Mon Jun 9 15:43:20 2014
From: David Woodhouse <[email protected]>
Date: Mon, 09 Jun 2014 14:09:53 +0100
Subject: [stable PATCH] iommu/vt-d: Fix missing IOTLB flush in
intel_iommu_unmap()
To: [email protected]
Cc: [email protected]
Message-ID: <[email protected]>
From: David Woodhouse <[email protected]>
Based on commit ea8ea460c9ace60bbb5ac6e5521d637d5c15293d upstream
This missing IOTLB flush was added as a minor, inconsequential bug-fix
in commit ea8ea460c ("iommu/vt-d: Clean up and fix page table clear/free
behaviour") in 3.15. It wasn't originally intended for -stable but a
couple of users have reported issues which turn out to be fixed by
adding the missing flush.
Signed-off-by: David Woodhouse <[email protected]>
---
For 3.14 and earlier. As noted, this fix is in 3.15 already.
drivers/iommu/intel-iommu.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4075,7 +4075,7 @@ static size_t intel_iommu_unmap(struct i
unsigned long iova, size_t size)
{
struct dmar_domain *dmar_domain = domain->priv;
- int order;
+ int order, iommu_id;
order = dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT,
(iova + size - 1) >> VTD_PAGE_SHIFT);
@@ -4083,6 +4083,22 @@ static size_t intel_iommu_unmap(struct i
if (dmar_domain->max_addr == iova + size)
dmar_domain->max_addr = iova;
+ for_each_set_bit(iommu_id, dmar_domain->iommu_bmp, g_num_of_iommus) {
+ struct intel_iommu *iommu = g_iommus[iommu_id];
+ int num, ndomains;
+
+ /*
+ * find bit position of dmar_domain
+ */
+ ndomains = cap_ndoms(iommu->cap);
+ for_each_set_bit(num, iommu->domain_ids, ndomains) {
+ if (iommu->domains[num] == dmar_domain)
+ iommu_flush_iotlb_psi(iommu, num,
+ iova >> VTD_PAGE_SHIFT,
+ 1 << order, 0);
+ }
+ }
+
return PAGE_SIZE << order;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.14/iommu-vt-d-fix-missing-iotlb-flush-in-intel_iommu_unmap.patch
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