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iommu/amd: Don't use 512GB pages

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There is a bug in the hardware that will be triggered when
this page size is used. Make sure this does not happen.

Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Joerg Roedel 2012-12-02 15:35:37 +01:00
parent 78bfa9f395
commit 954e3dd830
1 changed files with 3 additions and 1 deletions
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4
drivers/iommu/amd_iommu.c
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@ -66,8 +66,10 @@
*
* If at some point we'd like to utilize the IOMMU core's new behavior,
* we could change this to advertise the real page sizes we support.
*
* 512GB Pages are not supported due to a hardware bug
*/
#define AMD_IOMMU_PGSIZES (~0xFFFUL)
#define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38))
static DEFINE_RWLOCK(amd_iommu_devtable_lock);