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x86/mm/iommu/sva: Make LAM and SVA mutually exclusive

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IOMMU and SVA-capable devices know nothing about LAM and only expect
canonical addresses. An attempt to pass down tagged pointer will lead
to address translation failure.

By default do not allow to enable both LAM and use SVA in the same
process.

The new ARCH_FORCE_TAGGED_SVA arch_prctl() overrides the limitation.
By using the arch_prctl() userspace takes responsibility to never pass
tagged address to the device.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Reviewed-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20230312112612.31869-12-kirill.shutemov%40linux.intel.com
This commit is contained in:
Kirill A. Shutemov
2023-03-12 14:26:06 +03:00
committed by Dave Hansen
parent 400b9b9344
commit 23e5d9ec2b
6 changed files with 27 additions and 0 deletions
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7
include/linux/mmu_context.h
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@@ -35,4 +35,11 @@ static inline unsigned long mm_untag_mask(struct mm_struct *mm)
}
#endif
#ifndef arch_pgtable_dma_compat
static inline bool arch_pgtable_dma_compat(struct mm_struct *mm)
{
return true;
}
#endif
#endif