iommu/vt-d: Use cmpxchg16b to update posted format IRTE atomically

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If IRTE is in posted format, the 'pda' field goes across the 64-bit
boundary, we need use cmpxchg16b to atomically update it. We only
expose posted-interrupt when X86_FEATURE_CX16 is supported and use
to update it atomically.

Signed-off-by: Feng Wu <feng.wu@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Feng Wu 2015-10-15 10:19:11 +08:00 • committed by Joerg Roedel

parent dfddb969ed

commit 344cb4e0b6

1 changed files with 30 additions and 3 deletions

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drivers/iommu/intel_irq_remapping.c

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