360eb3c568
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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| math-emu | ||
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