lkml.org 
[lkml]   [2019]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 7/8] iommu/vt-d: Avoid sending invalid page response
Date
Page responses should only be sent when last page in group (LPIG) or
private data is present in the page request. This patch avoids sending
invalid descriptors.

Fixes: 5d308fc1ecf53 ("iommu/vt-d: Add 256-bit invalidation descriptor
support")
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-svm.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 71b85b892c56..4eecc24412dc 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -686,11 +686,10 @@ static irqreturn_t prq_event_thread(int irq, void *d)
if (req->priv_data_present)
memcpy(&resp.qw2, req->priv_data,
sizeof(req->priv_data));
+ resp.qw2 = 0;
+ resp.qw3 = 0;
+ qi_submit_sync(&resp, iommu);
}
- resp.qw2 = 0;
- resp.qw3 = 0;
- qi_submit_sync(&resp, iommu);
-
head = (head + sizeof(*req)) & PRQ_RING_MASK;
}

--
2.7.4
\
 
 \ /
  Last update: 2019-11-19 18:53    [W:0.088 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site