iommu/vt-d: Reject unsupported page request modes
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>
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@ -920,7 +920,17 @@ static irqreturn_t prq_event_thread(int irq, void *d)
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((unsigned long long *)req)[1]);
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goto no_pasid;
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}
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/* We shall not receive page request for supervisor SVM */
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if (req->pm_req && (req->rd_req | req->wr_req)) {
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pr_err("Unexpected page request in Privilege Mode");
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/* No need to find the matching sdev as for bad_req */
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goto no_pasid;
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}
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/* DMA read with exec requeset is not supported. */
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if (req->exe_req && req->rd_req) {
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pr_err("Execution request not supported\n");
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goto no_pasid;
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}
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if (!svm || svm->pasid != req->pasid) {
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rcu_read_lock();
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svm = ioasid_find(NULL, req->pasid, NULL);
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