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iommu/vt-d: Reject unsupported page request modes

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When supervisor/privilige mode SVM is used, we bind init_mm.pgd with
a supervisor PASID. There should not be any page fault for init_mm.
Execution request with DMA read is also not supported.

This patch checks PRQ descriptor for both unsupported configurations,
reject them both with invalid responses.

Fixes: 1c4f88b7f1f92 ("iommu/vt-d: Shared virtual address in scalable mode")
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Link: https://lore.kernel.org/r/1614680040-1989-4-git-send-email-jacob.jun.pan@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jacob Pan 2021-03-02 02:13:59 -08:00 committed by Joerg Roedel
parent bb0f61533d
commit 78a523fe73
1 changed files with 11 additions and 1 deletions
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12
drivers/iommu/intel/svm.c
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@ -920,7 +920,17 @@ static irqreturn_t prq_event_thread(int irq, void *d)
((unsigned long long *)req)[1]);
goto no_pasid;
}
/* We shall not receive page request for supervisor SVM */
if (req->pm_req && (req->rd_req | req->wr_req)) {
pr_err("Unexpected page request in Privilege Mode");
/* No need to find the matching sdev as for bad_req */
goto no_pasid;
}
/* DMA read with exec requeset is not supported. */
if (req->exe_req && req->rd_req) {
pr_err("Execution request not supported\n");
goto no_pasid;
}
if (!svm || svm->pasid != req->pasid) {
rcu_read_lock();
svm = ioasid_find(NULL, req->pasid, NULL);