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iommu/vt-d: Avoid sending invalid page response 

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>
alistair/sensors
Jacob Pan 2020-01-02 08:18:09 +08:00 committed by Joerg Roedel
parent 59a623374d
commit 5f75585e19
1 changed files with 3 additions and 4 deletions
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7
drivers/iommu/intel-svm.c
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@ -679,11 +679,10 @@ 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;
}