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[RFC,06/13] intel_iommu: vtd_slpt_level_shift check level

Message ID 1481020588-4245-7-git-send-email-peterx@redhat.com
State New
Headers show

Commit Message

Peter Xu Dec. 6, 2016, 10:36 a.m. UTC 
This helps in debugging incorrect level passed in.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/i386/intel_iommu.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 0f8387e..46b8a2f 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -188,6 +188,7 @@  static gboolean vtd_hash_remove_by_domain(gpointer key, gpointer value,
 /* The shift of an addr for a certain level of paging structure */
 static inline uint32_t vtd_slpt_level_shift(uint32_t level)
 {
+    assert(level != 0);
     return VTD_PAGE_SHIFT_4K + (level - 1) * VTD_SL_LEVEL_BITS;
 }