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iommu/vt-d: Don't set then clear private data in prq_event_thread()

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[ Upstream commit 1d421058c8 ]

The VT-d specification (section 7.6) requires that the value in the
Private Data field of a Page Group Response Descriptor must match
the value in the Private Data field of the respective Page Request
Descriptor.

The private data field of a page group response descriptor is set then
immediately cleared in prq_event_thread(). This breaks the rule defined
by the VT-d specification. Fix it by moving clearing code up.

Fixes: 5b438f4ba3 ("iommu/vt-d: Support page request in scalable mode")
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210320024156.640798-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lu Baolu 2021-03-20 10:41:56 +08:00 committed by Greg Kroah-Hartman
parent e0c7b95616
commit c96f7eb59b
1 changed files with 2 additions and 2 deletions
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4
drivers/iommu/intel/svm.c
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@ -1071,12 +1071,12 @@ static irqreturn_t prq_event_thread(int irq, void *d)
QI_PGRP_RESP_TYPE;
resp.qw1 = QI_PGRP_IDX(req->prg_index) |
QI_PGRP_LPIG(req->lpig);
resp.qw2 = 0;
resp.qw3 = 0;
if (req->priv_data_present)
memcpy(&resp.qw2, req->priv_data,
sizeof(req->priv_data));
resp.qw2 = 0;
resp.qw3 = 0;
qi_submit_sync(iommu, &resp, 1, 0);
}
prq_advance: