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iommu/vt-d: Avoid sending invalid page response 

[ Upstream commit 5f75585e19 ]

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: 5d308fc1ec ("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>
5.4-rM2-2.2.x-imx-squashed
Jacob Pan 2020-01-02 08:18:09 +08:00 committed by Greg Kroah-Hartman
parent 2aab9e9d1f
commit 960671ac50
1 changed files with 3 additions and 4 deletions
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7
drivers/iommu/intel-svm.c
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@ -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;
}