iommu/vt-d: Avoid sending invalid page response

[ Upstream commit 5f75585e19cc7018bf2016aa771632081ee2f313 ]

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>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index ff7a3f9..518d0b2 100644 (file)
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -654,11 +654,10 @@ 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;
        }