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intel_iommu: vtd_slpt_level_shift check level

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This helps in debugging incorrect level passed in.

Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Peter Xu 2017-02-07 16:28:11 +08:00 committed by Michael S. Tsirkin
parent 6c441e1d61
commit 7e58326ad7
1 changed files with 1 additions and 0 deletions
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hw/i386/intel_iommu.c
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@ -168,6 +168,7 @@ static gboolean vtd_hash_remove_by_domain(gpointer key, gpointer value,
/* The shift of an addr for a certain level of paging structure */ /* The shift of an addr for a certain level of paging structure */
static inline uint32_t vtd_slpt_level_shift(uint32_t level) 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; return VTD_PAGE_SHIFT_4K + (level - 1) * VTD_SL_LEVEL_BITS;
} }