diff options
| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2021-03-02 02:13:59 -0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-03-18 11:42:46 +0100 |
| commit | 78a523fe73b81b4447beb2d6c78c9fafae24eebb (patch) | |
| tree | b1e7df20e65be52d56f82c6d79b7626e75988686 /drivers/iommu | |
| parent | bb0f61533dfd6aa815a2719720c77d13f840b683 (diff) | |
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>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel/svm.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index 574a7e657a9a..4627437ae1c0 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -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); |