iommu/vt-d: use dedicated bitmap to track remapping entry allocation status

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Currently Intel interrupt remapping drivers uses the "present" flag bit
in remapping entry to track whether an entry is allocated or not.
It works as follow:
1) allocate a remapping entry and set its "present" flag bit to 1
2) compose other fields for the entry
3) update the remapping entry with the composed value

The remapping hardware may access the entry between step 1 and step 3,
which then observers an entry with the "present" flag set but random
values in all other fields.

This patch introduces a dedicated bitmap to track remapping entry
allocation status instead of sharing the "present" flag with hardware,
thus eliminate the race window. It also simplifies the implementation.

Tested-and-reviewed-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

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Jiang Liu 2014-01-06 14:18:08 +08:00 • committed by Joerg Roedel

parent dbad086433

commit 360eb3c568

2 changed files with 27 additions and 29 deletions

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55

drivers/iommu/intel_irq_remapping.c

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1

include/linux/intel-iommu.h

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